Publications
| Title | Abstract | Year Filter | PMID(sorted descending) Filter |
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| cloning, localization and differential expression of neuropeptide-y during early brain development and gonadal recrudescence in the catfish, clarias gariepinus. | neuropeptide-y (npy) has diverse physiological functions which are extensively studied in vertebrates. however, regulatory role of npy in relation to brain ontogeny and recrudescence with reference to reproduction is less understood in fish. present report for the first time evaluated the significance of npy by transient esirna silencing and also analyzed its expression during brain development and gonadal recrudescence in the catfish, clarias gariepinus. as a first step, full-length cdna of npy ... | 2017 | 28322767 |
| endocrine disruption, oxidative stress, and testicular damage induced by 4-nonylphenol in clarias gariepinus: the protective role of cydonia oblonga. | exposure to xenoestrogens like 4-nonylphenol (np) is recognized by disrupting endocrine functions and causes reproductive dysfunction in male fish. the present study aimed at investigating the 4-nonylphenol propensity to induce oxidative stress and hormonal disturbances in male catfish and at studying the protective role of quince (cydonia oblonga). to fulfill this aim, catfish clarias gariepinus were exposed to pure 100 μg/l 4-np and to quince the leaf extract added to 4-np, both for 15 days. t ... | 2017 | 28285354 |
| comparison of proximate composition and sensory attributes of clariid catfish species of clarias gariepinus, heterobranchus bidorsalis, and their hybrids. | clariid catfish are favorite food fish especially in african and asian continents. recently there has been preference for particular species or hybrids of these species based on quality assurance and value addition. consequently, this study aimed to evaluate the possible effect of different catfish species and their hybrids on proximate composition and sensory attributes. catfish species, clarias gariepinus (cc), heterobranchus bidorsalis (hh), with their hybrid (ch), and reciprocal hybrid (hc) ... | 2017 | 28265363 |
| temperature preference and sex differentiation in african catfish, clarias gariepinus. | the african catfish clarias gariepinus has a genetic sex determination system in which high temperature induces masculinization. the thermosensitive period for sex differentiation is short and occurs very early (from 6 to 8 days posthatching [dph]). as young juveniles can encounter high masculinizing temperature (36.5°c) in african water points, we aimed to determine the thermal preference of sexually undifferentiated juveniles and investigate if they spontaneously move toward high masculinizing ... | 2017 | 28247501 |
| performance of clarias gariepinus fed dried brewer's yeast (saccharomyces cerevisiae) slurry in replacement for soybean meal. | following disparity of earlier results, this study tested the performance of african catfish clarias gariepinus fed dried brewer's yeast slurry meal (dbym) based diets. fingerlings of c. gariepinus with pooled mean initial weight of 1.58 ± 0.01 g were stocked in hapas (1 m × 1 m × 1 m) immersed in an earthen pond at a density of 15 fish per cage. five diets with increasing substitution of soybean meal with 25%, 50%, 75%, and 100% of dried brewer's yeast and a control without dried brewer's yeast ... | 2017 | 28239492 |
| induction of apoptosis and dna damage by 4-nonylphenol in african catfish (clarias gariepinus) and the antioxidant role of cydonia oblonga. | in this study, we assessed the toxic effects of sub lethal concentration (0.1mgl(-1)) 4-nonylphenol (4-np) on serum biochemical parameters, liver lipid peroxidation (lpo) and antioxidant enzymes of the african catfish clarias gariepinus for 14 days and the ability of the quince leaf extract to alleviate the effects of (4-np). fish were categorized into four groups: control, exposure to 0.1mgl(-1) 4-np, exposure to 0.1mgl(-1) 4-np with quince leaf extract (10ml/30l water), and exposure to 0.1mgl( ... | 2017 | 28113117 |
| dna barcoding of clarias gariepinus, coptodon zillii and sarotherodon melanotheron from southwestern nigeria. | dna barcoding has been adopted as a gold standard rapid, precise and unifying identification system for animal species and provides a database of genetic sequences that can be used as a tool for universal species identification. in this study, we employed mitochondrial genes 16s rrna (16s) and cytochrome oxidase subunit i (coi) for the identification of some nigerian freshwater catfish and tilapia species. approximately 655 bp were amplified from the 5' region of the mitochondrial cytochrome c o ... | 2016 | 27990256 |
| subchronic exposure to fenthion induces hematological changes in liver tissue of african catfish clarias gariepinus. | in this study, african catfish (also known as sharptooth catfish) clarias gariepinus were exposed to sublethal concentrations of fenthion of 2.0, 4.0, and 8.0 mg/l for 21 d and allowed to recover for 7 d to investigate the potential for hematological changes. whole blood was sampled on days 1, 7, 14, and 21 postexposure and after a 7-d recovery period. during exposure, fenthion caused a reduction in red blood cell counts, hemoglobin concentration, and packed cell volume. there was an increase in ... | 2016 | 27764572 |
| short-term effects of albendazole on the oxidative stress markers and hematological parameters in tissues of african catfish clarias gariepinus. | albendazole (abz) is a typical broad-spectrum benzimidazole drug used for the treatment of parasitic worm infestations in humans and animals. the present study investigated the oxidative stress biomarkers and hematological parameters in juvenile african catfish (also known as sharptooth catfish) clarias gariepinus exposed to abz for 96 h. fish were exposed to 0 (control) 20, 40, and 60 mg/l abz. the liver and gill tissues were sampled at regular intervals of 24 h, and the results showed signific ... | 2016 | 27754768 |
| the role of the autonomic nervous system in control of cardiac and air-breathing responses to sustained aerobic exercise in the african sharptooth catfish clarias gariepinus. | clarias gariepinus is a facultative air-breathing catfish that exhibits changes in heart rate (ƒh) associated with air-breaths (ab). a transient bradycardia prior to the ab is followed by sustained tachycardia during breath-hold. this study evaluated air-breathing and cardiac responses to sustained aerobic exercise in juveniles (total length~20cm), and how exercise influenced variations in fh associated with ab. in particular, it investigated the role of adrenergic and cholinergic control in car ... | 2017 | 27720746 |
| high genetic diversity and population differentiation in clarias gariepinus of yala swamp: evidence from mitochondrial dna sequences. | in order to improve the conservation and sustainable utilization of the african catfish clarias gariepinus of the yala swamp in kenya, genetic diversity and population structure of lakes kanyaboli and namboyo populations of the species were studied using dna sequences of the mitochondrial d-loop control region. genetic diversity inferred as haplotype and nucleotide diversities and number of singletons and shared haplotypes was higher in the lake kanyaboli population (lkg) than the lake namboyo p ... | 2016 | 27687288 |
| poly- and perfluoroalkylated substances (pfass) in water, sediment and fish muscle tissue from lake tana, ethiopia and implications for human exposure. | lake tana is ethiopia's largest lake and there are plans to increase the harvest of fish from the lake. the objective of this study was to assess the levels of poly- and perfluoroalkyl substances (pfass) in different compartments of the lake (water, sediment, and fish muscle tissue), and its implications for human exposure. the results showed higher pfas concentrations in piscivorous fish species (labeobarbus megastoma and labeobarbus gorguari) than non-piscivorous species (labeobarbus intermedi ... | 2016 | 27665295 |
| protective potency of clove oil and its transcriptional down-regulation of aeromonas sobria virulence genes in african catfish (clarias gariepinus l.). | disease episodes of fish caused by aeromonas species are moved to the top list of limiting problems worldwide. the present study was planned to verify the in vitro antibacterial activities as well as the in vivo potential values of clove oil and ciprofloxacin against aeromonas sobria in african catfish (clarias gariepinus). the in vitro phenotypic virulence activities and the successful amplification of aerolysin and hemolysin genes in the precisely identified a. sobria strain were predictive fo ... | 2016 | 27609474 |
| inducible headkidney cytochrome p450 contributes to endosulfan immunotoxicity in walking catfish clarias gariepinus. | the effect of endosulfan metabolites on fish immune system is not well known. it is also not clear whether endosulfan accumulates in fish immune organs and undergoes metabolic biotransformation in situ. in the present study we investigated the role of headkidney (hk), an important fish immune organ on endosulfan metabolism and the long term effects of endosulfan metabolites on the fish immune system. c. gariepinus (walking catfish) were exposed to 2.884ppb of endosulfan (1/10th lc50) for 30d fol ... | 2016 | 27567944 |
| concentration of polychlorinated biphenyl (pcb) congeners in the muscle of clarias gariepinus and sediment from inland rivers of southwestern nigeria and estimated potential human health consequences. | the distributions of polychlorinated biphenyl (pcb) congeners were determined in sediment and muscle of the african sharptooth catfish (clarias gariepinus) from the ogun and ona rivers, southwest nigeria. in addition, the effect of pcb congeners on condition factor (cf) and associated human health risk was assessed using muscle levels for a noncarcinogenic hazard quotient (hq) calculation. elevated concentrations of high-molecular-weight (hmw) pcb congeners were detected in sediment and fish dow ... | 2016 | 27558803 |
| a comparison of biomarker responses in juvenile diploid and triploid african catfish, clarias gariepinus, exposed to the pesticide butachlor. | influence of waterborne butachlor (buc), a commonly used pesticide, on morphometric, biochemical, and molecular biomarkers was evaluated in juvenile, full sibling, diploid and triploid african catfish (clarias gariepinus). fish were exposed for 21 days to one of three concentrations of buc [mean measured µg/l: 22, 44 or 60]. unexposed (control) triploids were heavier and longer and had higher visceral-somatic index (vsi) than diploids. also, they had lighter liver weight (hsi) and showed lower t ... | 2016 | 27522569 |
| accumulation of copper in gill, liver, spleen, kidney and muscle tissues of clarias gariepinus exposed to the metal singly and in mixture with chitosan. | accumulation of copper (cu), applied singly and in mixture with chitosan (ct), in gill, liver, spleen, kidney and muscle tissues of clarias gariepinus was studied after exposing the fish to no cu (control), 5 ppm cu, 5 ppm cu + 75 ppm ct mixture over 1, 7 and 15 days. metal levels in tissues were determined using an icp-aes spectrophotometer. no mortality was observed during the experiments. highest accumulation of cu was observed in liver while lowest accumulation was observed in muscle tissue. ... | 2016 | 27502412 |
| morphological re-description and new geographical records for three digenean parasites infecting african sharptooth catfish clarias gariepinus (pisces: clariidae) in egypt. | sixty specimens of african sharptooth catfish clarias gariepinus (clariidae) were collected during the period of march 2014-february 2015 from boat landing sites and fishermen of the river nile at beni suef governorate, egypt, and examined for the presence of digenean parasites. the morphology of these parasites was studied by using light microscopy to describe morphological and morphometrically measurements for different body parts. three digenean species belonging to three different genera wer ... | 2016 | 27481172 |
| genotoxicity assessment and oxidative stress responses in freshwater african catfish clarias gariepinus exposed to fenthion formulations. | fenthion is one of the most widely used organophosphate insecticides for the control of many varieties of pests in nigeria. the genotoxic effect of the pesticide was evaluated in the blood erythrocytes of clarias gariepinus using the micronucleus (mn) test. the oxidative stress parameters were also studied in the liver and gill tissues. fish were exposed to 2.0, 4.0, and 8.0 mgl(-1) of fenthion and sampling was done on days 1, 7, 14, 21 and after 7-day recovery. micronuclei induction was highest ... | 2016 | 27460958 |
| first report of monogenean flatworms from lake tana, ethiopia: gill parasites of the commercially important clarias gariepinus (teleostei: clariidae) and oreochromis niloticus tana (teleostei: cichlidae). | lake tana is the largest lake in ethiopia and the source of the blue nile. the lake harbours unique endemic cyprinid fish species, as well as the commercially important endemic nile tilapia subspecies oreochromis niloticus tana and the north african catfish clarias gariepinus. its endemicity, especially within the labeobarbus radiation, its conservation importance and its economic indispensability attract scientific interest to the lake's ichthyofauna. fish parasites of lake tana, however, are h ... | 2016 | 27457488 |
| virgin microplastics cause toxicity and modulate the impacts of phenanthrene on biomarker responses in african catfish (clarias gariepinus). | despite the ubiquity of microplastics (mps) in aquatic environments and their proven ability to carry a wide variety of chemicals, very little is known about the impacts of virgin or contaminant-loaded mps on organisms. the primary aim of this study was to investigate the impacts of virgin or phenanthrene (phe)-loaded low-density polyethylene (ldpe) fragments on a suite of biomarker responses in juvenile african catfish (clarias gariepinus). virgin ldpe (50 or 500µg/l) were preloaded with one of ... | 2016 | 27451000 |
| immunotoxicological, biochemical, and histopathological studies on roundup and stomp herbicides in nile catfish (clarias gariepinus). | the current study was directed to investigate the immunotoxic and oxidative stress effects of roundup and stomp herbicides and their combination on nile catfish (clarias gariepinus). | 2016 | 27397989 |
| scanning and transmission electron microscopy of the histopathological impact of macrogyrodactylus clarii (monogenea: gyrodactylidae) on the gills of catfish, clarias gariepinus. | scanning and transmission electron microscopy (tem) were used to study the histopathological effects of the monogenean macrogyrodactylus clarii gussev, 1961 on the gills of the catfish clarias gariepinus (burchell). suction generated during attachment created 'footprints' on host surfaces in which the host tissues were elevated above the general gill surface. 'footprints' were bordered by four clefts caused by the muscular flaps on the anterior, lateral and posterior margins of the haptor. the h ... | 2016 | 27311695 |
| assessment of clarias gariepinus as a biological control agent against mosquito larvae. | the emergence and spread of insecticide resistant mosquitoes renewed interest in investigating the use of larvivorous fish as a biological control agent. the potential of clarias gariepinus fish in controlling anopheles arabiensis and culicine larvae was assessed under laboratory and semi-field conditions. | 2016 | 27245935 |
| alterations in juvenile diploid and triploid african catfish skin gelatin yield and amino acid composition: effects of chlorpyrifos and butachlor exposures. | skin is a major by-product of the fisheries and aquaculture industries and is a valuable source of gelatin. this study examined the effect of triploidization on gelatin yield and proximate composition of the skin of african catfish (clarias gariepinus). we further investigated the effects of two commonly used pesticides, chlorpyrifos (cpf) and butachlor (buc), on the skin gelatin yield and amino acid composition in juvenile full-sibling diploid and triploid african catfish. in two separate exper ... | 2016 | 27182978 |
| effects of acute stress on aggression and the cortisol response in the african sharptooth catfish clarias gariepinus: differences between day and night. | african sharptooth catfish clarias gariepinus were housed under continuous dim light (1 lx) or 12l:12d (350-0 lx) cycles. the number of skin lesions, as indicator of aggressive acts, and plasma cortisol levels, as indicator of stress-axis activity, were measured at baseline as well as following a stressor (given in the light or dark phase). results showed that (1) baseline plasma cortisol levels were not different between photoperiods, (2) the number of baseline skin lesions was highest for c. g ... | 2016 | 27125325 |
| histopathological alterations, biochemical responses and acetylcholinesterase levels in clarias gariepinus as biomarkers of exposure to organophosphates pesticides. | organophosphate pesticides, commonly used in large scale farming, have been found to be major contaminants in aquatic environment. clarias gariepinus was exposed to acute and sublethal concentrations of phostoxin and dd force to evaluate single and joint action toxicity of the organophosphates. effects of phostoxin and dd force on antioxidant enzymes, fish organs and acetylcholinesterase levels in fingerlings and juveniles of c. gariepinus were also investigated. the lethal concentrations (96 h ... | 2016 | 27121169 |
| a review of clarias gariepinus invasions in brazil and south africa. | african sharptooth catfish clarias gariepinus is native to most of africa and small parts of asia, but has been introduced to 37 countries mainly for aquaculture. this review of introductions, establishment, spread and impact of c. gariepinus in brazil and outside of its native range in south africa provides evidence that the species has been able to overcome all barriers to invasion in both countries. following initial introductions across geographical barriers, containment seems to have been i ... | 2016 | 27094809 |
| influence of mining pollution on metal bioaccumulation and biomarker responses in cave dwelling fish, clarias gariepinus. | cave ecosystems remain largely unstudied and risk being severely degraded as a result of anthropogenic activities. the wonderfontein cave, situated in the extensive gold mining region of the witwatersrand basin, is one such system that hosts a population of clarias gariepinus, which is exposed to the influx of polluted mine water from the wonderfontein spruit river. the aim of this study was to investigate the bioaccumulation of metals, as well as relevant biomarkers, in c. gariepinus specimens ... | 2016 | 27086300 |
| potential use of green macroalgae ulva lactuca as a feed supplement in diets on growth performance, feed utilization and body composition of the african catfish, clarias gariepinus. | this study aimed to evaluate the effects of diet containing the green macroalgae, ulva lactuca, on the growth performance, feed utilization and body composition of african catfish clarias gariepinus. four experimental diets were formulated: d1 as a control group and d2, d3 and d4 which included 10%, 20% and 30% u. lactuca meal, respectively. 180 african catfish, weighing 9.59 ± 0.43 g, and with an average length of 11.26 ± 0.21, (mean ± se) were divided into four groups corresponding to the diff ... | 2016 | 27081367 |
| genetic relatedness of salmonella serovars isolated from catfish (clarias gariepinus) and tilapia (tilapia mossambica) obtained from wet markets and ponds in penang, malaysia. | a total of 43 salmonella enterica isolates belonging to different serovars (salmonella albany, salmonella agona, salmonella corvallis, salmonella stanley, salmonella typhimurium, salmonella mikawasima, and salmonella bovismorbificans) were isolated from catfish (clarias gariepinus) and tilapia (tilapia mossambica) obtained from nine wet markets and eight ponds in penang, malaysia. thirteen, 19, and 11 isolates were isolated from 9 of 32 catfish, 14 of 32 tilapia, and 11 of 44 water samples, resp ... | 2016 | 27052872 |
| super-chilling (-0.7°c) with high-co2 packaging inhibits biochemical changes of microbial origin in catfish (clarias gariepinus) muscle during storage. | controlled freezing-point storage (cfps) is an emerging preservative technique desirable for fish. in the present study, catfish fillets were stored at -0.7°c under different packaging atmospheres: air (ap), vacuum (vp), and 60% co2/40% n2 (map). chemical, microbiological, and sensory analyses were performed during storage. results showed the following descending order of chemical changes (degradation of nucleotides, conversion of protein to volatile-based nitrogen and biogenic amines, and produ ... | 2016 | 27041314 |
| effects of endosulfan on predator-prey interactions between catfish and schistosoma host snails. | the effect of the pesticide endosulfan on predator-prey interactions between catfish and schistosoma host snails was assessed in static tank experiments. hybrid catfish (clarias gariepinus × c. ngamensis) and bulinus globosus were subjected to various endosulfan concentrations including an untreated control. the 48- and 96-h lc50 values for catfish were 1.0 and <0.5 µg/l, respectively, whereas the 48- and 96-h lc50 values for snails were 1137 and 810 µg/l. to assess sublethal effects on the feed ... | 2016 | 27033099 |
| diploid and triploid african catfish (clarias gariepinus) differ in biomarker responses to the pesticide chlorpyrifos. | the impacts of environmental stressors on polyploid organisms are largely unknown. this study investigated changes in morphometric, molecular, and biochemical parameters in full-sibling diploid and triploid african catfish (clarias gariepinus) in response to chlorpyrifos (cpf) exposures. juvenile fish were exposed to three concentrations of cpf (mean measured μg/l (sd): 9.71 (2.27), 15.7 (3.69), 31.21 (5.04)) under a static-renewal condition for 21days. diploid control groups had higher hepatoso ... | 2016 | 26994807 |
| evaluation of red seaweed gracilaria arcuata as dietary ingredient in african catfish, clarias gariepinus. | the aim of this study was to evaluate the use of dried marine seaweed, gracilaria arcuata for the first time as dietary ingredient in partial substitution of fishmeal on the growth performance, feed utilization and body composition of african catfish, clarias gariepinus. four experimental diets were formulated: d1 as a control group; d2; d3 and d4 which included 10%, 20% and 30% g. arcuata meal respectively. one hundred and eighty african catfish weighing 9.62 ± 0.42 g, (mean ± se) was divided i ... | 2016 | 26981001 |
| antioxidant and antiapoptotic activities of calotropis procera latex on catfish (clarias gariepinus) exposed to toxic 4-nonylphenol. | calotropis procera l. is known as medicinal plant. the phytochemical analyzes of its latex revealed that it possessed antioxidants, namely terpenes, phenolic compounds and cardenolides, flavonoids and saponins, while tannins, alkaloids and resin were absent in moderate to high concentration. in the present study, the role of latex of calotropis procera as antioxidant and antiapoptotic was reported. to carry out this aim, fishes were exposed to 100 µg l(-1) 4-nonylphenol as chemical pollutant. th ... | 2016 | 26946283 |
| cdna sequence and protein bioinformatics analyses of mstn in african catfish (clarias gariepinus). | myostatin, also known as growth differentiation factor 8, has been identified as a potent negative regulator of skeletal muscle growth. the purpose of this study was to characterize and predict function of the myostatin gene of the african catfish (cg-mstn). expression of cg-mstn was determined at three growth stages to establish the relationship between the levels of mstn transcript and skeletal muscle growth. the partial cdna sequence of cg-mstn was cloned by using published information from i ... | 2016 | 26912268 |
| the effect of dietary cricket meal (gryllus bimaculatus) on growth performance, antioxidant enzyme activities, and haematological response of african catfish (clarias gariepinus). | this study was conducted to investigate the growth performance, biomarkers of oxidative stress, catalase (cat), superoxide dismutase (sod), and glutathione s-transferase (gst) as well as the haematological response of african catfish after being fed with fish feed containing different levels of cricket meal. the juvenile fish were assigned to three different treatments with isonitrogenous (35 %) and isoenergetic (19 kj g(-1)) diets containing 100 % cricket meal (100 % cm), 75 % cricket meal (75 ... | 2016 | 26886132 |
| acute phenanthrene toxicity to juvenile diploid and triploid african catfish (clarias gariepinus): molecular, biochemical, and histopathological alterations. | information on the biological responses of polyploid animals towards environmental contaminants is scarce. this study aimed to compare reproductive axis-related gene expressions in the brain, plasma biochemical responses, and the liver and gill histopathological alterations in diploid and triploid full-sibling juvenile african catfish (clarias gariepinus). fish were exposed for 96 h to one of the two waterborne phenanthrene (phe) concentrations [mean measured (sd): 6.2 (2.4) and 76 (4.2) μg/l]. ... | 2016 | 26845363 |
| genomic organization of repetitive dnas highlights chromosomal evolution in the genus clarias (clariidae, siluriformes). | the genus clarias (clariidae, siluriformes) contains at least 61 species naturally spread over vast regions of asia, india and africa. however, clarias species have also been introduced in many different countries and represent the most widespread catfishes in the world. these fishes are also known as "walking catfishes" due to their ability to move over land. a large degree of chromosomal variation has been previously found in this family, mainly using conventional cytogenetic investigations, w ... | 2016 | 26793275 |
| grafting of gallic acid onto chitosan nano particles enhances antioxidant activities in vitro and protects against ochratoxin a toxicity in catfish (clarias gariepinus). | this study aimed to prepare and characterize enzymatic modified chitosan nanoparticles (csnps) with gallic acid (ga) or octyl gallate (og) to optimize its potential in human application and to evaluate their protective role against ochrtoxin a (ota) toxicity in catfish. the modified csnps have average size around 90 nm with positive charge and high scavenging activity especially ga-csnps. in the in vivo study, catfish were divided into 8 groups and treated for 3 weeks as follow: the control grou ... | 2016 | 26774075 |
| supplemental effects of mixed ingredients and rice bran on the growth performance, survival and yield of nile tilapia, oreochromis niloticus reared in fertilized earthen ponds. | unaffordability of commercial feeds to semi-intensive nile tilapia, oreochromis niloticus farmers has led to reliance on supplemental feeding and fertilization for nutrition of their fish without a scientific basis. this study compared the growth, survival, condition factor and yield performance of o. niloticus fed on mixed ingredients (mi) and rice bran alone (rb) diets reared in fertilized earthen ponds in small scale farmers' ponds. the study also determined phytoplankton composition, biomass ... | 2016 | 26759744 |
| interactions between the intestinal cestode polyonchobothrium clarias (pseudophyllidea: ptychobothriidae) from the african sharptooth catfish clarias gariepinus and heavy metal pollutants in an aquatic environment in egypt. | in an aquatic environment, there is a profound and inverse relationship between environmental quality and disease status of fish. parasites are one of the most serious limiting factors in aquaculture. therefore, the present investigation was carried out during the period of february-december 2014 to determine the parasitic infections in the african sharptooth catfish clarias gariepinus, relative to the capability of internal parasites to accumulate heavy metals. up to 100 catfish were examined f ... | 2016 | 26743114 |
| toxicological assessment of fish (clarias gariepinus) from bitumen-polluted river oluwa, nigeria. | toxicological evaluation of clarias gariepinus from bitumen-polluted river oluwa, nigeria, was carried out in furtherance of studies on the environmental impacts of the bitumen exploration in ondo state, nigeria. samples were taken from three different (two polluted and one as control) sites. the effect of changes in monthly seasonal flow rate was assessed for the sites of study. blood plasma clinical-chemical parameters (bccps) and histological changes/lesions in various organs were evaluated a ... | 2016 | 26725477 |
| ploidy-, gender-, and dose-dependent alteration of selected biomarkers in clarias gariepinus treated with benzo[a]pyrene. | naturally-occurring and artificially-induced polyploids have been documented in various fish species but to date no comparison has been reported of the impacts of ploidy on fish biomarker responses to organic pollutants. this study describes effects of ploidy, gender, and dose on biliary fluorescent aromatic compound (fac) concentrations, hepatic ethoxyresorufin-o-deethylase (erod) and glutathione s-transferase (gst) activities in one of the most commonly cultured warm-water species, the african ... | 2015 | 26702972 |
| stock assessment of fishery target species in lake koka, ethiopia. | effective management is essential for small-scale fisheries to continue providing food and livelihoods for households, particularly in developing countries where other options are often limited. studies on the population dynamics and stock assessment on fishery target species are thus imperative to sustain their fisheries and the benefits for the society. in lake koka (ethiopia), very little is known about the vital population parameters and exploitation status of the fishery target species: til ... | 2015 | 26666131 |
| to boldly gulp: standard metabolic rate and boldness have context-dependent influences on risk-taking to breathe air in a catfish. | the african sharptooth catfish clarias gariepinus has bimodal respiration, it has a suprabranchial air-breathing organ alongside substantial gills. we used automated bimodal respirometry to reveal that undisturbed juvenile catfish (n=29) breathed air continuously in normoxia, with a marked diurnal cycle. air breathing and routine metabolic rate (rmr) increased in darkness when, in the wild, this nocturnal predator forages. aquatic hypoxia (20% air saturation) greatly increased overall reliance o ... | 2015 | 26632454 |
| the nervous systems of tylodelphys metacercariae (digenea: diplostomidae) from the catfish clarias gariepinus (clariidae) in freshwater habitats of tanzania. | the nervous systems of three tylodelphys metacercariae (t. mashonense, tylodelphys spp. 1 and 2) co-occurring in the cranial cavity of the catfish, clarias gariepinus, were examined by the activity of acetylthiocholine iodide (acthi), with the aim of better understanding the arrangement of sensillae on the body surface and the nerve trunks and commissures, for taxonomic purposes. enzyme cytochemistry demonstrated a comparable orthogonal arrangement in the three metacercariae: the central nervous ... | 2016 | 26620462 |
| in vivo micronucleus test in the assessment of cytogenotoxicity of landfill leachates in three animal models from various ecological habitats. | the in vivo micronucleus (mn) test, a standard test for the genotoxicity screening of xenobiotics, was used to evaluate the cytotoxic and genotoxic activities of landfill leachates in clarias gariepinus, coturnix coturnix japonica and rattus norvegicus. these organisms were exposed to various sub-lethal concentrations (1-50%) of olusosun and aba eku landfill leachates. at post exposure, peripheral erythrocytes from catfish and quail, and bone marrow cells of quail and rat were subjected to mn an ... | 2016 | 26589948 |
| effect of peanut powder (arachis hypogeae l., 1753) on zootechnic parameters and sex inversion in catfish clarias gariepinus. | benin is currently experiencing an overexploitation of piscatorial resources; this requires the research of endogenous means to increase the biomass of fish produced thanks to fish farming activities. the present study intends to improve the zootechnic performances and inverse the sex in catfish clarias gariepinus. therefore, 240 larvae obtained from artificial reproduction were used for this study. three different feed were tested. the control feed (to) was without peanut powder; contrary, the ... | 2015 | 26571988 |
| neurotransmitters and neuronal apoptotic cell death of chronically aluminum intoxicated nile catfish (clarias gariepinus) in response to ascorbic acid supplementation. | few studies have been carried out to assess the neurotoxic effect of aluminum (al) on the aquatic creatures. this study aims to evaluate the neurotoxic effects of long term al exposure on the nile catfish (clarias gariepinus) and the potential ameliorative influence of ascorbic acid (asa) over a 180 days exposure period. forty eight nile catfish were divided into four groups: control group, placed in clean water, asa exposed group (5mg/l), alcl3 received group (28.96 μg/l; 1/20 lc50), and group ... | 2015 | 26459186 |
| glutathione s-transferase activities in african catfish injected with β-naphthoflavone: effects of ploidy, gender, dose, and sampling time. | glutathione s-transferases (gst) are considered among the most controversial biomarkers of water pollutants in fish with little known about factors influencing their activities. the objective of this study was to investigate how gender, dose, ploidy, and sampling time alter hepatic gst activities in african catfish (clarias gariepinus) following β-naphthoflavone (β-nf) injection. newly matured male and female diploid and triploid fish were intraperitoneally (i.p.) injected with 0, 15, or 75 mg/k ... | 2015 | 26452505 |
| risk assessment of agricultural pesticides in water, sediment, and fish from owan river, edo state, nigeria. | the distribution of pesticides in water, sediments, clarias gariepinus, and tilapia zilli from the owan river was investigated to evaluate the pollution status and potential hazard in the river system. a total of 16 pesticides were analyzed using gas chromatography (gc) equipped with electron capture detector (ecd). the concentration of pesticide residues ranged from nd to 0.43 μg/l for water samples, 0.82 to 2.14 μg/kg/dw for sediment, 0.04 to 2.34 μg/kg/ww for c. gariepinus, and 0.02 to 1.73 μ ... | 2015 | 26423632 |
| completion of the life cycle of tylodelphys mashonense (sudarikov, 1971) (digenea: diplostomidae) with dna barcodes and rdna sequences. | the life cycle of tylodelphys mashonense (digenea: diplostomidae), whose metacercariae occur in the cranial cavity of the widely cultivated catfish clarias gariepinus, was resolved by the application of molecular markers. both coi barcodes and its sequences obtained from diplostomid-like cercariae infecting bulinus spp. from mindu dam, morogoro, matched those acquired from metacercariae from the catfish c. gariepinus, and those from adult t. mashonense from the grey heron ardea cinerea and the w ... | 2015 | 26122993 |
| reproductive biology of female nile tilapia oreochromis niloticus (linnaeus) reared in monoculture and polyculture with african sharptooth catfish clarias gariepinus (burchell). | this study was conducted to assess the reproductive biology and early breeding behaviour of female oreochromis niloticus reared in monoculture and polyculture with clarias gariepinus in earthen ponds for 8 months. results revealed no significant difference in length at first maturity (l50) between females reared in monoculture and polyculture systems. similarly, no significant differences were detected in absolute fecundity, relative fecundity, gonado-somatic index and condition factor between t ... | 2015 | 26090322 |
| negative impacts of ultraviolet-a radiation on antioxidant and oxidative stress biomarkers of african catfish clarias gariepinus. | the present study was carried out to evaluate the ultraviolet-a (uva) effects on biochemical, oxidative stress and antioxidant changes using aquatic species. the destructive effects of ultraviolet-a radiation on the african catfish, clarias gariepinus was revealed in terms of the carbonyl protein (cp), lipid peroxidation (lpo), dna damage, super oxide dismutase (sod), catalase (cat), glutathione peroxidase (gpx), glutathione reductase (gr), glucose-6-phosphate dehydrogenase (g6pdh), lactate dehy ... | 2015 | 26084758 |
| effect of steaming process on new formulation and physical properties of earthworm-based fish pellets for african catfish (clarias gariepinus). | fish feed has been recognized as one of main part/unit in aquaculture industry. however, current fish feed faces few challenges in terms of health aspects and cost issues. alternatively, new nutritional and economical/low cost formulation of fish pellets was designed by combination of earthworm powder and other economical ingredients such as fishmeal, soybean waste, rice bran and tapioca flour. the formulation was calculated using pearson's square and optimized by one-factor-at-time (ofat) metho ... | 2014 | 26031027 |
| response of some antioxidant parameters in post juveniles of clarias gariepinus after exposure to nigerian crude oil (forcados, bonny light and qua-iboe). | the adverse effect of crude oil on aquatic ecosystem is a modern day peril. this study investigated the acute toxicities of some nigerian crude oil (forcados, bonnylight and qua-iboe) against clarias gariepinus and the antioxidant enzyme response of the fish to the pollutants. the toxicity assessment was based on lc50 at 96 h. static renewal bioassays were used to determine the toxicological effects of the 3 crude oils on the antioxidant enzymes of post juveniles clarias gariepinus using the liv ... | 2014 | 26027169 |
| trace elements in water, soil, earthworm and fishes from otokutu end of warri river, delta state, nigeria. | selected environmental samples such as water, fishes (tilapia mariae and clarias gariepinus), earthworm (libyodrillus violaceous) and soils were obtained from the otokutu end of warri river, digested with acid mixtures and analyzed for trace metal concentrations using the atomic absorption spectrophotometry. the trace metals measured include; zinc, lead, copper, arsenic, iron, cadmium and mercury. the results obtained showed variations in the concentrations of metals in the entire samples analyz ... | 2014 | 26027158 |
| control of cardiorespiratory function in response to hypoxia in an air-breathing fish, the african sharptooth catfish, clarias gariepinus. | we evaluated the role of the first pair of gill arches in the control of cardiorespiratory responses to normoxia and hypoxia in the air-breathing catfish, clarias gariepinus. an intact group (ig) and an experimental group (eg, bilateral excision of first gill arch) were submitted to graded hypoxia, with and without access to air. the first pair of gill arches ablations reduced respiratory surface area and removed innervation by cranial nerve ix. in graded hypoxia without access to air, both grou ... | 2015 | 26006299 |
| autonomic control of post-air-breathing tachycardia in clarias gariepinus (teleostei: clariidae). | the african catfish (clarias gariepinus) is a teleost with bimodal respiration that utilizes a paired suprabranchial chamber located in the gill cavity as an air-breathing organ. like all air-breathing fishes studied to date, the african catfish exhibits pronounced changes in heart rate (f h) that are associated with air-breathing events. we acquired f h, gill-breathing frequency (f g) and air-breathing frequency (f ab) in situations that require or do not require air breathing (during normoxia ... | 2015 | 25982049 |
| twelve myxosporean species of the family myxobolidae infecting freshwater fishes of the river nile, egypt, with the description of four novel species. | myxosporidian parasites infecting fish are very dangerous parasites causing severe damage to a large number of economically important fishes especially in aquaculture. a survey of myxosporean parasites infecting four species of fishes from the river nile in egypt is conducted. one hundred and ninety-five out of 316 fish specimens with a percentage of 61.7% were found to be naturally infected with these parasites. light microscopic examination of different tissues revealed the presence of 12 myxo ... | 2015 | 25952702 |
| some pathophysiological insights into ovarian infestation by myxobolus sp. (myxozoa: myxosporea) in clarias gariepinus (clariids: silurids) from bénin (west africa). | mature female specimens of the catfish clarias gariepinus originating from ouémé river (benin) were investigated into ovarian myxozoan parasites. spores of myxobolus sp. (myxozoa: myxosporea) were found encrusted in the whitish color oocytes which present fat dot aspect in the gonads. the pathological investigation by electron microscopy revealed that maturation and multiplication of spores induced lytic action, deformation and dysfunction of the oocyte internal structures. no host inflammatory ... | 2015 | 25952701 |
| treatment of african catfish, clarias gariepinus wastewater utilizing phytoremediation of microalgae, chlorella sp. with aspergillus niger bio-harvesting. | this study focuses on the evaluation of the performance of chlorella sp. in removing nutrient in aquaculture wastewater and its correlation with the kinetic growth of chlorella sp. the treatment was applied with various chlorella sp. inoculation dosage ranging from 0% to 60% (v/v) of wastewater. the optimum inoculation dosage was recorded at 30% (v/v) with effluent concentration of ammonia and orthophosphate recording at 0.012mgl(-1) and 0.647mgl(-1), respectively on day 11. the optimum dosage f ... | 2015 | 25791330 |
| oxidative stress, heats shock protein and histopathological effects in the gills of african catfish, clarias gariepinus induced by bridge runoffs. | this study assessed the level of oxidative stress and heat shock proteins (hsp) induced in gills and liver as well as the histopathological effects in the gills of african catfish, clarias gariepinus, exposed to runoff water from the third mainland bridge, the busiest bridge in the city of lagos, nigeria. the runoff was sampled off the bridge drainage, and the assessment of its physicochemical characteristics in both dry and rainy season indicated a high level of chemical and biological oxygen d ... | 2015 | 25757832 |
| effects of acute exposure to endosulfan (organochlorine pesticides) on hematology of african mud catfish, clarias gariepinus (burchell, 1822). | changes in the blood parameters of fingerlings of clarias gariepinus were investigated after 24 and 96-h of exposures to endosulfan. 180 fingerlings of c. gariepinus [mean weight (10.5±1.3 g); total length (11.2±1.2 cm)] were exposed to five different concentrations (1.00, 2.20, 4.80, 11.00, 23.00 µg/l) of endosulfan and a control for 96 h after being acclimatized for 21 days. after 24 h of exposure, microcytic hypochromic anemia was observed and all erythrocyte profiles tested showed significan ... | 2015 | 25726008 |
| effect of different pretreatments on functional properties of african catfish (clarias gariepinus) skin gelatin. | pretreatments with different types of alkali and acid were compared to determine their effects on gelatin extraction from african catfish (clarias gariepinus) skin. the study was divided into three parts. in the first part, the skins were only treated with alkaline (ca(oh)2 or naoh) solution or pretreated with acetic acid solution. for second part, combination of alkali and acid pretreatment was carried out. for the third part, the skins were first treated with naoh solution, followed by the tre ... | 2015 | 25694683 |
| procamallanus (procamallanus) spp. (nematoda: camallanidae) in fishes of the okavango river, botswana, including the description of p. (p.) pseudolaeviconchus n. sp. parasitic in clarias spp. (clariidae) from botswana and egypt. | parasitological dissections of fishes from the okavango river, botswana, revealed the presence of nematodes of the subgenus procamallanus (procamallanus) baylis, 1923 in five fish species belonging to three different families. based on light and scanning electron microscopical examinations, they proved to represent one previously known and one new species, i.e. p. (p.) laeviconchus (wedl, 1861) from synodontis nigromaculatus boulenger, s. thamalakanensis fowler (new host) (both mochokidae) and s ... | 2015 | 25655113 |
| white mulberry (morus alba) foliage methanolic extract can alleviate aeromonas hydrophila infection in african catfish (clarias gariepinus). | two experiments were simultaneously conducted with morus alba (white mulberry) foliage extract (mfe) as a growth promoter and treatment of aeromonas hydrophila infection in separate 60 and 30 days trail (experiments 1 and 2, resp.) in african catfish (clarias gariepinus). in experiment 1, four diets, control and control supplemented with 2, 5, or 7 g mfe/kg dry matter (dm) of diet, were used. in experiment 2, fish were intraperitoneally infected with aeromonas hydrophila and fed the same diets a ... | 2014 | 25574488 |
| histopathological and ultrastructural studies of a henneguya species (myxozoa: myxosporea) infesting the intestine of clarias gariepinus from benin (west africa). | fish culture is the best alternative to fill the gap between natural fish catches and estimated needs of populations in animal protein consumption. in west africa, this goal required to have suitable fishes for aquaculture which are clariidae and tilapia. clarias gariepinus (clariidae) fetches a higher price than tilapias as it can be sold alive at the market but a high infestation by henneguya leads to decrease this commercial value. those reasons lead us to perform studies on seasonal variatio ... | 2015 | 25538022 |
| sharptooth catfish shows its metal: a case study of metal contamination at two impoundments in the olifants river, limpopo river system, south africa. | clarias gariepinus is increasing in importance as a global aquaculture species with a 100 fold increase in production over the past decade but this species still remains one of the most important wild harvested freshwater food fish throughout rural africa. however, this species has been shown to accumulate metals from contaminated inland waters. in this paper, the metal concentrations in muscle tissue of c. gariepinus from two main-stem impoundments in the olifants river, limpopo basin, were mea ... | 2015 | 25463859 |
| dietary fucoidan enhance the non-specific immune response and disease resistance in african catfish, clarias gariepinus, immunosuppressed by cadmium chloride. | fucoidan is sulfated polysaccharide extracted from seaweed brown algae. this study was designed to evaluate the immunomodulatory effects and disease resistance of dietary fucoidan on catfish, clarias gariepinus, immunosuppressed by cadmium. three hundred and sixty african catfish, c. gariepinus, was allocated into six equal groups. the first group served as a control. groups (f1 and f2) were fed on fucoidan supplemented ration at concentrations of 4 and 6g/kg diet respectively for 21 days. group ... | 2014 | 25454084 |
| pesticides used in cotton production affect reproductive development, endocrine regulation, liver status and offspring fitness in african catfish clarias gariepinus (burchell, 1822). | we exposed african catfish clarias gariepinus from embryo-larvae stage to adult stage (13 months old, bw) to chronic doses of tihan 175 o-teq and endosulfan (thionex) and assessed the impact of this exposure on endocrine regulation, liver status and offspring fitness. endosulfan exposure caused a significant increase in plasma estradiol-17β (e2) and decreased plasma testosterone (t) but not 11 ketotestosterone (11-kt). tihan decreased significantly plasma e2 and 11-kt, but not t. endosulfan dose ... | 2015 | 25445569 |
| assessment of the health status of wild fish inhabiting a cotton basin heavily impacted by pesticides in benin (west africa). | to determine the impact of agricultural pesticides used in cotton cultivation on the health status of fish living in a beninese cotton basin, we compared the reproductive and hepatic systems of fish sampled from rivers located in both contaminated and pristine conditions. different types of biomarkers, including biometric indices (a condition factor k, a gonadosomatic index gsi, and a hepatosomatic index hsi), plasma levels of sex steroids (11-ketotestosterone 11-kt, testosterone t and estradiol ... | 2015 | 25433386 |
| a new intracellular bacterium, candidatus similichlamydia labri sp. nov. (chlamydiaceae) producing epitheliocysts in ballan wrasse, labrus bergylta (pisces, labridae). | certain wrasse species (labridae) are used as cleaner fish in salmon farms on the norwegian coast, reducing salmon louse intensities. the pathogen repertoire of wrasse in norway is poorly known, and the objective of the present study is to describe a novel intracellular bacterium detected in norwegian labrus bergylta. histological examination of gill tissues from ballan wrasse, l. bergylta, revealed epitheliocysts occurring basally to the secondary lamellae in the interlamellar epithelium. ultra ... | 2015 | 25416125 |
| economic values of growth and feed efficiency for fish farming in recirculating aquaculture system with density and nitrogen output limitations: a case study with african catfish (clarias gariepinus). | in fish farming, economic values (ev) of breeding goal traits are lacking, even though they are key parameters when defining selection objectives. the aim of this study was to develop a bioeconomic model to estimate ev of 2 traits representing production performances in fish farming: the thermal growth coefficient (tgc) and the feed conversion ratio (fcr). this approach was applied to a farm producing african catfish (clarias gariepinus) in a recirculating aquaculture system (ras). in the ras, 2 ... | 2014 | 25414104 |
| chronic diclofenac (dcf) exposure alters both enzymatic and haematological profile of african catfish, clarias gariepinus. | pharmaceuticals are used extensively in human and veterinary medicine to eradicate or prevent diseases. the residues of these drugs have been detected in aquatic ecosystem; nevertheless, their toxicological effects on clarias gariepinus have not been critically investigated. in this study, the toxic effects of diclofenac (dcf), a non-steroid anti-inflammatory drug, were studied in c. gariepinus by acute and chronic static renewable bioassay. the 96 h lc50 of dcf to c. gariepinus was 25.12 mg/l. ... | 2015 | 25367777 |
| organochlorine pesticide levels in clarias gariepinus from polluted freshwater impoundments in south africa and associated human health risks. | there are increasing concerns regarding the safe human consumption of fish from polluted, freshwater impoundments. the aim of this study was to analyse the muscle tissue of the sharptooth catfish clarias gariepinus for selected organo-chlorine pesticides (ocps) and to perform a human health risk assessment using a standard protocol described by the united states environmental protection agency (us epa). fish were collected from the polluted roodeplaat-(rdpd), rietvlei-(rvd) and hartbeespoort (hb ... | 2015 | 25214015 |
| oxidative stress and biochemical responses in the tissues of african catfish clarias gariepinus juvenile following exposure to primextra herbicide. | primextra is a commercial herbicide formulation generally used in agriculture for weed control. the present study was designed to investigate the oxidative stress biomarkers and biochemical responses in the tissues of clarias gariepinus juvenile exposed to primextra. fish were exposed to 0.24 and 0.47 mgl(-1) corresponding to 1/20 and 1/10th of 96 h lc50 of the herbicide. the liver and muscle tissues were sampled on day 1, 5, 10 and 15 and results showed concentration and time dependent signific ... | 2015 | 25116447 |
| mutagenic and physiological responses in the juveniles of african catfish, clarias gariepinus (burchell 1822) following short term exposure to praziquantel. | praziquantel (pzq) is an acylated quinoline-pyrazine originally developed for veterinary application but now one of the most used anti-helminthic drugs for treatment of certain trematodes and cestodes in both human and other animals. the present study investigated the mutagenic and physiological responses in the juveniles of african catfish, clarias gariepinus following short term exposure to praziquantel. based on the 53.52 mg/l 96 h lc50 of pzq obtained, two sublethal concentrations of 5.35 an ... | 2014 | 24974067 |
| solar drying and organoleptic characteristics of two tropical african fish species using improved low-cost solar driers. | this study was done to evaluate the drying performance, efficiency, and effectiveness of five different types of improved low-cost solar driers in terms of moisture loss from two tropical african fish species clarias gariepinus (african sharp tooth catfish) and oreochromis niloticus (nile tilapia) and testing the organoleptic characteristics of the dried samples. the driers used were made from plastic, aluminum, glass, glass with black igneous stone, and mosquito net, with traditional direct ope ... | 2014 | 24936294 |
| studies on phytoremediation of copper using pteridium aquilinum (bracken fern) in the presence of biostimulants and bioassay using clarias gariepinus juveniles. | a study was carried out to evaluate the uptake of copper from water containing 10 mg/l copper by pteridium aquilinum (bracken fern) and clarias gariepinus in the presence of five plant growth stimulants: nitrogen: phosphorus: potassium (15-15-15: an inorganic fertilizer), pig, cattle, poultry, and a mixture of pig/cattle manures. a plant growth stimulant differentiated each treatment. a 96-hour bioassay using c. gariepinus was carried out at the end of the experiment to test the efficacy of the ... | 2014 | 24912219 |
| concentrations and human health risk assessment of organochlorine pesticides in edible fish species from a rift valley lake-lake ziway, ethiopia. | fish consumption is known to have several health benefits for humans. however, the accumulation of organic pollutants, like organochlorine pesticides (ocps) could pose health hazards. thus, ocps in edible fish species (oreochromis niloticus, tilapia zillii, carassius spp., and clarias gariepinus) from lake ziway, an ethiopian rift valley lake were investigated to assess the potential human health hazards of these contaminants. dichlorodiphenyltrichloroethanes (ddts), hexachlorocyclohexanes (hchs ... | 2014 | 24836883 |
| sublethal toxicity of carbofuran on the african catfish clarias gariepinus: hormonal, enzymatic and antioxidant responses. | the present study examined the impacts of carbofuran on endocrinology of the catfish, clarias gariepinus, for the first time and evaluated cortisol (crt), triiodothyronine (t3), thyroxin (t4), 17β-estradiol (e2) and testosterone (tst) and the oxidative stress markers including sod, cat, gsts, gsh. the toxic effects on the metabolic enzymes, g6pdh and ldh, in addition to lipid peroxidation (lpo) and dna damage as biomarkers in nile catfish, to sublethal exposures of carbofuran (0.16 and 0.49mg/l, ... | 2014 | 24836875 |
| on some ultrastructural features of the reproductive system of the monogenean parasite macrogyrodactylus congolensis from clarias gariepinus inhabiting the river nile in egypt. | some organs of the reproductive system of the protogynous monogenean skin parasite macrogyrodactylus congolensis (prudhoe, 1957) yamaguti, 1963 have been studied using transmission electron microscopy. the vesicula seminalis is enclosed by a prominent layer of circular muscle fibres and has inner syncytial protrusions. the penis bulb is a highly muscular organ with prominent radial and circular muscle fibres, a gutter-shaped large spine and 16 small spines. two syncytial male accessory glands, a ... | 2014 | 24827092 |
| estimate of mercury and methyl mercury intake associated with fish consumption from sagua la grande river, cuba. | this paper provides an estimate of the weekly intake of total mercury (thg) and methyl mercury (mehg) from consumption of fish from the sagua la grande river, villa clara, cuba, by determining the thg levels in different fish species. the levels varied between 0.143 and 0.484 μ g g(-1) on a fresh weight basis. none of the analysed fish was found to have levels above the national and international regulatory levels, although thg levels over 0.2 μ g g(-1), the threshold concentration established b ... | 2009 | 24784960 |
| analysis of environmental chemical residues in products of emerging aquaculture industry in uganda as case study for sub-saharan africa. | a study was conducted to analyse market-regulated heavy metals (lead, mercury and cadmium), organochlorine pesticides and total polychlorinated biphenyls (pcbs) in samples of 38 farmed fish comprising nile tilapia (oreochromis niloticus) (20 samples) and african catfish (clarias gariepinus) (18 samples) from ten selected fish farms in uganda. the goal of this case study was to understand the safety of aquaculture products from sub-saharan africa. lead was detected in all the 38 samples (maximum ... | 2008 | 24784813 |
| dietary effects of spaghetti waste as maize replacement in the diet of juvenile african catfish, clarias gariepinus. | a 56-day experiment was conducted with clarias gariepinus juvenile to evaluate the effects of replacing maize with spaghetti waste (sw). four isonitrogenous experimental diets were formulated by substituting maize with spaghetti waste at different graded levels of 50, 75 and 100%, respectively with a control (100% maize). the experiment was run in triplicate and fish distributed into 21 plastic tanks. the fish were fed to satiation twice daily and water changed every two days to maintain good wa ... | 2014 | 24783793 |
| high rates of substitution of the native catfish clarias batrachus by clarias gariepinus in india. | the clariid catfish, clarias batrachus commonly known as magur, has declined drastically from natural habitats in india during the last decade. this fish is highly preferred fish by indian consumers and has high market demand. as a result traders often substitute c. batrachus with a morphologically similar but supposedly banned exotic catfish, c. gariepinus, in india. this study uses rigorous morphological comparisons confirmed by dna barcode analysis to examine the level of substitution of c. b ... | 2016 | 24708138 |
| alternative responses to predation in two headwater stream minnows is reflected in their contrasting diel activity patterns. | animals exhibit diel periodicity in their activity in part to meet energy requirements whilst evading predation. a competing hypothesis suggests that partitioning of diel activities is less important because animals capitalise on opportunity. to test these hypotheses we examined the diel activity patterns for two cyprinid minnows, chubbyhead barb barbus anoplus and the eastern cape redfin minnow pseudobarbus afer that both occur within headwater streams in the eastern cape, south africa. chubbyh ... | 2014 | 24691382 |
| existing and emerging high impact invasive species are characterized by higher functional responses than natives. | predicting ecological impacts of invasive species and identifying potentially damaging future invaders are research priorities. since damage by invaders is characterized by their depletion of resources, comparisons of the 'functional response' (fr; resource uptake rate as a function of resource density) of invaders and natives might predict invader impact. we tested this by comparing frs of the ecologically damaging 'world's worst' invasive fish, the largemouth bass (micropterus salmoides), with ... | 2014 | 24522629 |
| morphological and histomorphological structure of testes of the catfish "clarias gariepinus" from egypt. | knowledge of the normal reproductive biology of catfish is of a great importance not only for better understanding of the theory of fish development, but also to be used as a baseline for understanding the pathological changes results form exposure to harmful toxicants. thus, the aim of the current study was to elucidate the gross anatomical and light microscopic features of the testes of the catfish "clarias gariepinus" from egypt. the present study was carried out on 36 mature male catfish (cl ... | 2013 | 24505985 |
| occurrence of parotoid glands in tadpoles of the tropical frog, clinotarsus curtipes and their role in predator deterrence. | tadpoles of the tropical bicolored frog, clinotarsus curtipes are unique in having parotoid glands secreting a white viscous fluid and are structurally similar to granular glands from other amphibians. to ascertain the involvement of these glands and their secretion in predator deterrence, it was tested against a predatory fish, clarias gariepinus, using a paired choice behavioral assay. the results showed that the fish avoid eating c. curtipes tadpoles when paired with tadpoles of a sympatric s ... | 2014 | 24468740 |
| sublethal toxicity of carbofuran pesticide on the african catfish clarias gariepinus (burchell, 1822): hematological, biochemical and cytogenetic response. | the present work aimed to evaluate the toxic effects of two sublethal concentrations of carbofuran pesticide (0.16 and 0.49mg/l, for 35 days) on hematological and blood biochemical parameters of catfish, clarias gariepinus, and to evaluate the genotoxic potential of carbofuran on the erythrocytes of c. gariepinus for the first time by micronucleus and erythrocyte alteration assays. the results revealed a significant (p<0.05) decrease in red blood cells (rbcs) count, haemoglobin (hb) concentratio ... | 2014 | 24461394 |
| effect of lactobacillus plantarum c014 on innate immune response and disease resistance against aeromonas hydrophila in hybrid catfish. | a bacterial strain isolated from intestines of hybrid catfish (clarias gariepinus male × clarias macrocephalus female) exhibited an in vitro inhibitory effect on a fish pathogen, aeromonas hydrophila tistr 1321. by using the 16s rdna sequence analysis, it was identified as lactobacillus plantarum c014. to examine whether l. plantarum c014 had potential for use as an immunostimulant and biocontrol agent in hybrid catfish, the fish diet supplemented with l. plantarum c014 (10(7) cfu/g diet) was pr ... | 2013 | 24453842 |
| descriptions of diplostomid metacercariae (digenea: diplostomidae) from freshwater fishes in the tshwane area. | the metacercarial (larval) stages of diplostomid digeneans are known to inhabit freshwater fish, causing tissue damage in the process. due to their widespread diversity, little is known about their life cycle. the classification of these parasitic stages to the species level using only the morphology is very challenging due to the lack of genitalia; they are regarded to be the most important structures in the identification of these organisms. in this study, additional morphological information ... | 2013 | 24396918 |
| selected haematological changes in clarias gariepinus (burchell, 1822) infected with a trypansosoma sp. from the vaal dam, south africa. | the use of haematological techniques to assess fish health is generally accepted. the aim of the current study was to determine selected haematological changes that occur in clarias gariepinus (burchell, 1822). infected with trypanosomes. blood films were prepared according to standard techniques to confirm trypanosome infections and whole blood was collected, the serum and plasma separated, and prepared for albumin and total protein concentration analysis. plasma albumin levels were significant ... | 2013 | 24396914 |
| effect of catfish supplementation on the fatty acid status and growth of undernourished rural preschool children under 6 years of age: an intervention trial in lebowa, south africa. | a group of 102 preschool children aged 13-69 months from a rural area of lebowa were selected from a cross-sectional study of 659 children for an intervention trial (12 months) to study the effect of catfish (clarias gariepinus) supplementation on their plasma phospholipid fatty acid status and growth. they were classified into undernourished and control groups according to their weight-for-age. the undernourished children (n = 52) received 43 g fish and 7.5 g sunflower cooking oil per day, wher ... | 1999 | 24393792 |
| novel bacteriophage therapy for controlling metallo-beta-lactamase producing pseudomonas aeruginosa infection in catfish. | the bacteriophage therapy is an effective antimicrobial approach with potentially important applications in medicine and biotechnology which can be seen as an additional string in the bow. emerging drug resistant bacteria in aquaculture industry due to unrestricted use of antibiotics warrants more sustainable and environmental friendly strategies for controlling fish infections.the isolated bacteria from fish lesions was characterised based on isolation on selective and differential medium like ... | 2013 | 24369750 |
| mortality, oxidative stress and hepatotoxicity in juvenile african catfish, clarias gariepinus burchell, exposed to lead and cypermethrin. | in this study, juvenile catfish (clarias gariepinus) were exposed to 2 mg/l pb, 0.5 μg/l cypermethrin, or both for 96 h. survival ranged from 100% in both treatments without cypermethrin, to 50% in fish exposed to cypermethrin only or the mixture. there were significant decreases in liver lysozyme, γ-glutamyl transpeptidase, and alanine aminotransferase activities in fish exposed to cypermethrin or the mixture. liver aspartate aminotransferase activity (ast) showed a significant reduction after ... | 2014 | 24292780 |