| cell phone-generated radio frequency electromagnetic field effects on the locomotor behaviors of the fishes poecilia reticulata and danio rerio. | the locomotor behavior of small fish was characterized under a cell phone-generated radio frequency electromagnetic field (rf emf). | 2015 | 26073525 |
| short-term exposure to low doses of rotenone induces developmental, biochemical, behavioral, and histological changes in fish. | rotenone, a natural compound derived from plants of the genera derris and lonchocarpus, is used worldwide as a pesticide and piscicide. this study aims to assess short-term toxicity of rotenone to early-life stages of the fish danio rerio and poecilia reticulata using a wide and integrative range of biomarkers (developmental, biochemical, behavioral, and histopathological). moreover, the species sensitivity distribution (ssd) approach was used to compare rotenone acute toxicity to fish species. ... | 2015 | 25948382 |
| selecting a sensitive battery of bioassays to detect toxic effects of metals in effluents. | the use of bioassay batteries is necessary to evaluate toxic effects at various biological levels. the selection of bioassays without prior testing and determination of the most sensitive/suitable groups for each impact may allow the discharge of effluents that pose a threat to the environment. the present study tested and selected a battery of sensitive ecotoxicological bioassays for detecting toxic effects of metals. the sensitivities of six organisms were evaluated (algae pseudokirchneriella ... | 2014 | 25199585 |
| comparison of the sensitivity of different fish species to medical substances. | formaldehyde, sodium chloride and potassium permanganate belong to the commonly used substances for fish treatment. the aim is to define and compare their acute toxicity and therapeutic index between two fish species - danio rerio and poecilia reticulata. | 2009 | 20027179 |
| effect of short-time exposures to nickel and lead on brain monoamine oxidase from danio rerio and poecilia reticulata. | the aim of this work was to verify, in two small size freshwater teleosts danio rerio and poecilia reticulata, the effects of short-time exposures (24 and 72 h) to a sublethal dose (500 microg/l) of nickel and lead, on brain monoamine oxidase (mao), an important neural enzyme. the 24-h treatment using both metals caused a strong reduction of mao activity in d. rerio brain, whereas causing a slight mao activity stimulation in p. reticulata brain. the same treatment in both species did not affect ... | 2009 | 18767136 |
| comparison of the sensitivity of danio rerio and poecilia reticulata to silver nitrate in short-term tests. | the aim of this study is to assess the acute toxicity of silver nitrate in adult zebra fish and adult guppies and to compare the sensitivity of these species to this compound. silver is a naturally occurring element in our environment and it combines with other elements such as sulfide, chloride, and nitrate. silver, in the form of silver nitrate, is one of the most toxic metals affecting freshwater fish. industry, particularly photographical and electrotechnical, is the major contributor of sil ... | 2008 | 21218114 |
| meiotic chromosomes and stages of sex chromosome evolution in fish: zebrafish, platyfish and guppy. | we describe sc complements and results from comparative genomic hybridization (cgh) on mitotic and meiotic chromosomes of the zebrafish danio rerio, the platyfish xiphophorus maculatus and the guppy poecilia reticulata. the three fish species represent basic steps of sex chromosome differentiation: (1) the zebrafish with an all-autosome karyotype; (2) the platyfish with genetically defined sex chromosomes but no differentiation between x and y visible in the sc or with cgh in meiotic and mitotic ... | 2001 | 11778689 |
| nonlinkage of major histocompatibility complex class i and class ii loci in bony fishes. | in tetrapods, the functional (classical) class i and class ii b loci of the major histocompatibility complex (mhc) are tightly linked in a single chromosomal region. in an earlier study, we demonstrated that in the zebrafish, danio rerio, order cypriniformes, the two classes are present on different chromosomes. here, we show that the situation is similar in the stickleback, gasterosteus aculeatus, order gasterosteiformes, the common guppy, poecilia reticulata, order cyprinodontiformes, and the ... | 2000 | 10663573 |
| [the use of the aquarium fishes danio rerio and poecilia reticulata as highly sensitive species for testing the carcinogenicity of chemical compounds]. | aquarium fishes danio rerio and poecilia reticulata are recommended as test-objects for testing carcinogenic chemical agents. 30 compounds were tested for their action on these objects. the analysis of the incidence of induced tumors, period of their appearance and iball index shows high sensitivity of the aquarium fishes to the carcinogenic action. data are presented on the dynamics of experimental carcinogenesis, morphology of induced tumours, as well as on modifications of carcinogenesis (the ... | 1987 | 3691391 |
| use of aquarium fish, danio rerio and poecilia reticulata, as test species for evaluation of nitrosamine carcinogenicity. | the carcinogenic effects of various doses of dimethylnitrosamine (dmna), diethylnitrosamine (dena), and nitrosomorpholine (nm), as well as the results of varying temperature and length of exposure to these carcinogens, were studied in short-term (20-21 wk) experiments in aquarium fish (820 danio rerio and 944 poecilia reticulata). all nitroso compounds induced liver tumors (hepatocellular carcinomas and adenomas, cholangiomas, and cholangiocarcinomas) and esophageal papillomas. exposure to nm al ... | 1984 | 6462200 |
| an assessment of the physicochemical properties and toxicity potential of carwash effluents from professional carwash outlets in gauteng province, south africa. | the assessment of the quality of carwash effluents has received scant attention as a potential source of public and environmental health hazard in south africa as demonstrated by the lack of literature in this subject. the physicochemical quality and potential ramifications of carwash effluents on receiving waterbodies were investigated in this study. grab effluent samples were collected from six carwash outlets in gauteng province of south africa and analysed for selected physicochemical qualit ... | 2016 | 26957430 |
| acute toxicity and environmental risk of teflubenzuron to daphnia magna, poecilia reticulata and lemna minor in the absence and presence of sediment. | this study aimed to estimate the acute toxicity of teflubenzuron (1-(3,5-dichloro-2,4-difluorophenyl)-3-(2,6-difluorobenzoyl)urea) (tfb) for daphnia magna, lemna minor and poecilia reticulata, in the absence and presence of sediment; evaluate the effect of sediment on the tfb bioavailability; and to classify this insecticide according to its environmental poisoning risk for agricultural and aquaculture uses. the tests of tfb acute toxicity were conducted in static system in a completely randomiz ... | 2013 | 23581694 |
| sublethal effects of trimethoprim on four freshwater organisms. | sublethal effects of trimethoprim (tmp) were evaluated in four freshwater organisms: pseudokirchneriella subcapitata and lemna minor (growth inhibition), daphnia magna (reproduction and growth inhibition) and poecilia reticulata (swimming activity inhibition). cytochrome p4501a induction was also evaluated in p. reticulata. tmp showed varying levels of toxicity in the four test performed, with noec for the various endpoints in the range of 3.12-25 mg l(-1). the compound was active on p. reticula ... | 2012 | 22687886 |
| posetic quantitative superstructure/activity relationships (qssars) for chlorobenzenes. | as a result of the widespread industrial use of polychlorinated hydrocarbons, they have accumulated in nearly all types of environmental compartments, especially in aquatic systems. particularly, chloroaromatics are among the most undesirable industrial effluents because of their persistence and toxicity. to predict chlorobenzene (cb) toxicities, we make use of a novel scheme that looks beyond simple molecular structure to the manner in which such a structure embeds in an overall reaction networ ... | 2006 | 16045280 |
| study on the toxicity of sodium bromide to different freshwater organisms. | the toxicity of sodium bromide for freshwater organisms was tested using algae (scenedesmus pannonicus), crustaceans (daphnia magna) and fish (poecilia reticulata and oryzias latipes). depending on the species tested, the acute toxicity varied from 44 to 5800 mg br-/litre (ec50 values) and the no observed effect concentrations (noec values) in the long-term tests varied from 7.8 to 250 mg br-/litre. bromide ion markedly impaired reproduction in both crustaceans and fish. histologically no effect ... | 1983 | 6684619 |
| comparison of bioconcentration factors of tetrachlorobenzyltoluenes in the guppy (poecilia reticulata) and zebra mussel (dreissena polymorpha). | preliminary bioconcentration factors (bcfs) were determined of six tetrachlorobenzyltoluenes (tcbts) in guppies (poecilia reticulata). bcfs and rate constants were derived by an iterative integration method. with this method bcfs and rate constants can be derived from experimental data of a bioconcentration test, even if the concentration in the water is not constant and steady state has not been reached. log bcf values of tcbts in guppies ranged from 1.67 to 2.68 l.kg-1 on a wet weight basis. t ... | 1996 | 8920593 |
| no evidence for learned mating discrimination in male drosophila pseudoobscura. | since females often pay a higher cost for heterospecific matings, mate discrimination and species recognition are driven primarily by female choice. in contrast, frequent indiscriminate matings are hypothesized to maximize male fitness. however, recent studies show that previously indiscriminate males (e.g., drosophila melanogaster and poecilia reticulata) can learn to avoid heterospecific courtship. this ability of males to discriminate against heterospecific courtship may be advantageous in po ... | 2006 | 16824212 |
| the evolution of senescence in natural populations of guppies (poecilia reticulata): a comparative approach. | model organisms like drosophila melanogaster or caenorhabditis elegans have revealed genes that influence senescence and the evolvability of senescence. we are interested instead in evaluating why and how senescence evolves in natural populations. to do so, we are taking the ecological geneticist's perspective of comparing natural populations that differ in factors that are predicted to influence the evolution of senescence and are evaluating whether senescence has evolved in the predicted fashi ... | 2001 | 11295514 |
| ultrastructural and ultrahistochemical studies of post-mortem changes and effects of hypoxia in the bony fish heart. | the ultrastructural and ultrahistochemical properties of post-mortem changed and hypoxic heart tissue of gadus virens, gadus morhua, and poecilia reticulata are described. when incubated for 0.5 h at 20 degrees c the cardiac tissue is rich in vacuoles and endocardial blebs. after 1 h of incubation, the myocardial mitochondria contain some amorphous, flocculent densities (50-100 nm), which seem to increase in number and size with advancing incubation time. furthermore, the mitochondria in heart p ... | 1985 | 3999184 |
| shared and unique features of evolutionary diversification. | a fundamental question in evolutionary biology asks whether organisms experiencing similar selective pressures will evolve similar solutions or whether historical contingencies dominate the evolutionary process and yield disparate evolutionary outcomes. it is perhaps most likely that both shared selective forces as well as unique histories play key roles in the course of evolution. consequently, when multiple species face a common environmental gradient, their patterns of divergence might exhibi ... | 2004 | 15478089 |
| opsin sequences of the rod visual pigments in two species of poeciliid fish | the rod opsin sequences from gambusia affinis holbrooki and poecilia reticulata were cloned and sequenced. the opsin sequences were found to be 96·8% identical, reflecting the similarity of the rod visual pigment absorbances in these two poeciliid fish. | 1997 | 9236103 |
| mosquito control in wastewater: a controlled and quantitative comparison of pupfish (cyprinodon nevadensis amargosae), mosquitofish (gambusia affinis) and guppies (poecilia reticulata) in sago pondweed marshes. | we compared the abilities of pupfish, mosquitofish and guppies to control mosquitoes in wastewater marshes. all species of fish reduced mosquito emergence. when fish population densities were similar, fish reduced emergence to similar levels. as experiments progressed, guppies developed greater population densities and provided better mosquito control than mosquitofish, which developed greater densities and better control than pupfish. fish also reduced numbers of zooplankton, and guppies increa ... | 1990 | 1973447 |
| relative susceptibility of common vector mosquito larvae and larvivorous fish, gambusia affinis and poecilia reticulata to three new insecticides. | | 1985 | 2872250 |
| biomphalaria straminea (mollusca: planorbidae) as an intermediate host of drepanocephalus spp. (trematoda: echinostomatidae) in brazil: a morphological and molecular study. | species of trematodes belonging to the genus drepanocephalus are intestinal parasites of piscivorous birds, primarily cormorants (phalachrocorax spp.), and are widely reported in the americas. during a 4-year malacological study conducted on an urban lake in brazil, 27-collar-spined echinostome cercariae were found in 1665/15,459 (10.7 %) specimens of biomphalaria straminea collected. the cercariae were identified as drepanocephalus spp. by sequencing the 18s (ssu) rdna, its1/5.8s rdna/its2 (its ... | 2016 | 25982569 |
| evaluation of guppy (poecilia reticulata peters) immunization against tetrahymena sp. by enzyme-linked immunosorbent assay (elisa). | analysis of the effectiveness of guppy (poecilia reticulata peters) immunization based on measurements of antibody (ab) titers suffers from a shortage of reagents that can detect guppy antibodies (abs). to overcome this problem, we immunized mice with different preparations of guppy immunoglobulins (igs) and used the mouse antisera to develop a quantitative enzyme-linked immunosorbent assay (elisa). the most efficient immunogen for mouse immunization was guppy igs adsorbed on protein a/g beads. ... | 2014 | 25085773 |
| identification of quantitative trait locus (qtl) linked to dorsal fin length from preliminary linkage map of molly fish, poecilia sp. | a preliminary linkage map was constructed by applying backcross and testcross strategy using microsatellite (ssr) markers developed for xiphophorus and poecilia reticulata in ornamental fish, molly poecilia sp. the linkage map having 18 ssr loci consisted of four linkage groups that spanned a map size of 516.1cm. association between genotypes and phenotypes was tested in a random fashion and qtl for dorsal fin length was found to be linked to locus msb069 on linkage group 2. coincidentally, locu ... | 2014 | 24333858 |
| melanoides tuberculata (mollusca: thiaridae) harboring renicolid cercariae (trematoda: renicolidae) in brazil. | melanoides tuberculata , naturally infected by gymnocephalous cercariae, were found in aquatic collections from belo horizonte, minas gerais, brazil. after morphological characterization, larvae were used for experimental infection of poecilia reticulata. metacercariae were obtained from the liver of these fish, which were also found to be naturally infected in the same locality. the morphology and biology of the developmental stages of trematodes we obtained were characteristic of renicola sp. ... | 2012 | 22288437 |
| treatment development for systemic tetrahymena sp. infection in guppies, poecilia reticulata peters. | antibacterial and antiparasitic agents and a cysteine protease inhibitor (e-64) were tested against tetrahymena infection, a serious problem in guppy production worldwide. chemicals were tested in vitro by a colorimetric assay for tetrahymena survival. the most effective were niclosamide, albendazole and chloroquine, with 23%, 35% and 60% survival, respectively, following 2-h exposure to 100 ppm. longer incubation periods resulted in greater reductions in survival. niclosamide was further studie ... | 2010 | 20298452 |
| cysteine proteases and acid phosphatases contribute to tetrahymena spp. pathogenicity in guppies, poecilia reticulata. | systemic tetrahymenosis caused by the protozoan parasite tetrahymena spp. is a serious problem in guppy (poecilia reticulata) farms worldwide. there is no therapeutic solution for the systemic form of this disease. guppies severely infected with tetrahymena spp. were imported by a commercial ornamental fish farm and brought to our laboratory. tetrahymena sp. (tet-ni) was isolated and in vitro cultured. isolates maintained in culture for different time periods (as reflected by different numbers o ... | 2009 | 19720465 |
| protective immunization against tetrahymena sp. infection in guppies (poecilia reticulata). | systemic tetrahymenosis constitutes a serious problem in guppy (poecilia reticulata) production worldwide and no therapeutic solution is available for this disease. three immunization trials were conducted, testing the effectiveness of different tetrahymena preparations applied by intraperitoneal injection (ip) with or without freund's complete adjuvant (fca) and with or without booster dose. in trial 1, immunization with the pathogenic tet-ni 6 lysate and live attenuated tet-ni 1 did not provid ... | 2009 | 19490943 |
| environmental and physiological conditions affecting tetrahymena sp. infection in guppies, poecilia reticulata peters. | parasitic infections caused by tetrahymena sp. constitute a serious problem in guppies, poecilia reticulata. tetrahymena was isolated from skin lesions of naturally infected guppies in a commercial aquaculture farm, cultured in vitro and used in subsequent experimental infections. in addition to guppies, angelfish, pterophyllum scalare, platyfish, xiphophorus maculates, and neontetra, paracheirodon innesi, were susceptible, whereas tilapia (oreochromis niloticus xo. aureus) was resistant. the ci ... | 2005 | 16266327 |
| predation's role in life-history evolution of a livebearing fish and a test of the trexler-deangelis model of maternal provisioning. | populations experiencing consistent differences in predation risk and resource availability are expected to follow divergent evolutionary trajectories. for example, live-history theory makes specific predictions for how predation should drive life-history evolution, and according to the trexler-deangelis model for the evolution of matrotrophy, postfertilization maternal provisioning is most likely to evolve in environments with consistent, high levels of resource availability. using the model sy ... | 2013 | 23234847 |
| evaluating the use of ram and suction during prey capture by cichlid fishes. | we characterized prey-capture strategies in seven species of cichlid fishes representing diverse trophic habits and anticipated feeding abilities. the species examined were petenia splendida, cichla ocellaris, cichlasoma minckleyi, astronotus ocellatus, crenicichla geayi, heros severus (formerly cichlasoma severum) and cyprichromis leptosoma. three individuals per species were filmed with video at 500 hz as they captured live adult artemia sp. and poecilia reticulata. for each feeding sequence, ... | 2001 | 11551992 |