| a survey of gnathostoma larvae in fresh water fish in the valley of the yangtze river and morphological characteristics of the recovered larvae. | investigations of the prevalence of larval gnathostomes in fresh water fishes were carried out at the southeastern yangtze valley, people's republic of china, in the periods of october 1989 and november 1990. fishes were collected from shanghai, chenchiang, nanching, chiuchiang and nanchang districts in 1989. additional sampling in shanghai district was done at kunshan, tien-shanfu, chingpu and nanhui. species of fishes collected were channa argus (110), siniperca chuatsi (24) and silurus asotus ... | 1996 | 9185266 |
| identification, localization and morphology of apud cells in gastroenteropancreatic system of stomach-containing teleosts. | aim:to identify the type localization and morphology of apud endocrine cells in the gastroenteropancreatic (gep) system of stomach-containing teleosts, and study apud endocrine system in the stomach, intestine and pancreas of fish species.methods:two kinds of immunocytochemical (icc) techniques of the streptavidin biotin-peroxidase complex (sabc) and streptavidin-peroxidase (s-p) method were used. the identification, localization and morphology of apud endocrine cells scattered in the mucosa of ... | 2000 | 11819706 |
| gene structures and promoter characteristics of interferon regulatory factor 1 (irf-1), irf-2 and irf-7 from snakehead channa argus. | three interferon regulatory factor (irf) genes, cairf-1, cairf-2 and cairf-7, and their promoters of snakehead (channa argus) were cloned and characterized. the cairf-1 gene consists of ten exons, spans 4.3 kb and encodes a putative peptide of 299 aa. the cairf-2 gene consists of nine exons, spans 8 kb and encodes a putative peptide of 328 aa. the gene organizations of cairf-1 and cairf-2 are very similar to that of human irf-1 and irf-2 except more compact. comparison of exon-intron organizatio ... | 2008 | 18291530 |
| molecular structural and functional characterization of stat1 gene regulatory region in teleost channa argus. | the transcription factor stat1 is involved in signal transduction of type i and ii interferons (ifns). however, the molecular characteristics of the stat1 regulatory region still remain to be elucidated in teleosts. in the present study, the complete cdna and the regulatory region of the stat1 gene were isolated from snakehead (channa argus). more than 2.4kb 5'-flanking region of stat1 shares the regulatory elements of ifn-stimulated response element (isre) and ifn-gamma activation site (gas). c ... | 2010 | 20004484 |
| [gnathostoma larvae investigation in fresh water fishes in the valley of chinese chang river and the morphological characteristics of the larvae]. | an investigations were carried out on the prevalence of larval gnathostomes in fresh water fishes in southeast area of the yang-tze valley, the people's republic of china, from october to november. the fishes were collected from five districts which were from shanghai, chenchiang, nanching, chiuchiang and nanchang, especially the shanghai district involved kunshan, tienshanhu, chingpu and nanhui areas. species of the fishes collected were channa argus (110), siniperca chuatssi (24) and silurus a ... | 2010 | 20653198 |
| Purification, characterization and cDNA cloning of a trypsin from the hepatopancreas of snakehead (Channa argus). | A trypsin was purified from the hepatopancreas of snakehead (Channa argus) by ammonium sulfate fractionation and a series of column chromatographies including DEAE-Sepharose, Sephacryl S-200 HR and Hi-Trap Capto-Q. The molecular mass of the purified trypsin was about 22kDa, as estimated by SDS-PAGE. The optimum pH and temperature of the purified trypsin were 9.0 and 40°C, respectively. The trypsin was stable in the pH range of 7.5-9.5 and below 45°C. The enzymatic activity was strongly inhibited ... | 2011 | 22155550 |
| identification of largemouth bass virus in the introduced northern snakehead inhabiting the chesapeake bay watershed. | the northern snakehead channa argus is an introduced species that now inhabits the chesapeake bay. during a preliminary survey for introduced pathogens possibly harbored by these fish in virginia waters, a filterable agent was isolated from five specimens that produced cytopathic effects in bf-2 cells. based on pcr amplification and partial sequencing of the major capsid protein (mcp), dna polymerase (dnapol), and dna methyltransferase (mtase) genes, the isolates were identified as largemouth ba ... | 2013 | 23895368 |
| molecular phylogeny and host specificity of the larval eustrongylides (nematoda: dioctophmidae) from freshwater fish in china. | the nematodes eustrongylides spp. collected from different fish species in china were examined for their intra- and interspecific evolutionary variations using the molecular markers mitochondrial cytochrome oxidase c subunit 1 (coi) gene and internal transcribed spacer (its) rdna regions. the phylogenetic analysis indicated that eustrongylides species are divided into 3 well-supported clades. the its divergence between the clades suggested that clades 2 and 3 might represent the same species, wh ... | 2013 | 22924908 |
| novel pentapeptide, palal, derived from a bony fish elicits contraction of the muscle in starfish patiria pectinifera. | a bioactive peptide mimicking peptide-signaling molecules has been isolated from the skin extract of fish channa argus which caused contraction of the apical muscle of a starfish patiria pectinifera, a deuterostomian invertebrate. the primary structure of the isolated pentapeptide comprises amino acid sequence of h-pro-ala-leu-ala-leu-oh (palal) with a molecular mass of 483.7 da. pharmacological activity of palal, dosage ranging from 10(-9) to 10(-5) m, revealed concentration-dependent contracti ... | 2016 | 27506561 |
| distribution and accumulation of polycyclic aromatic hydrocarbons (pahs) in the food web of nansi lake, china. | the concentrations of polycyclic aromatic hydrocarbons (pahs) were analyzed in water, sediment, and biota (aquatic plant, shrimp, and fish) of nansi lake by gas chromatography-mass spectrometry (gc-ms). the concentrations of total pahs were 27.54-55.04 ng l(-1) in water, 80.31-639.23 ng g(-1) dry weight (dw) in sediments, 20.92-192.78 ng g(-1) dw in aquatic plants, and 67.3-533.9 ng g(-1) dw in fish and shrimp muscles. the ratios of phenanthrene to anthracene (ph/an), fluoranthene to pyrene (flu ... | 2015 | 25762425 |
| distribution and bioaccumulation of organochlorine pesticides (ocps) in food web of nansi lake, china. | the concentration of 12 organochlorine pesticides (ocps) were measured in water, sediment, aquatic plant, and animal (shrimp and fish) of nansi lake by gas chromatography equipped with an electron capture detector. the total ocps concentrations were 65.31-100.31 ng l(-1) in water, 2.9-6.91 ng g(-1) dry weight (dw) in sediments, 1.29-6.42 ng g(-1) dw in aquatic plants and 7.57-17.22 ng g(-1) dw in animals. the ocps composition profiles showed that heptachlor compounds was also the predominant ocp ... | 2014 | 24213638 |
| does air-breathing meet metabolic demands of the juvenile snakehead, channa argus in multiple conditions. | the objective of this study was to examine how the respiratory metabolism of the snakehead channa argus changed when it shifted from breathing water to breathing air and how increased metabolic demands caused by temperature, feeding, and exhaustive exercise affect its survival in air. the results demonstrated that the oxygen consumption rate (mo2) of the snakehead was lower for aerial respiration than aquatic respiration by 12.1%, 24.5%, and 20.4% at 20, 25, and 30°c, respectively. survival time ... | 2017 | 28396489 |
| draft genome of the northern snakehead, channa argus. | the northern snakehead ( channa argus ), a member of the channidae family of the perciformes, and is an economically important freshwater fish native to east asia. in north america, it has become notorious as an intentionally released invasive species. its ability to breathe air with gills and migrate short distances over land makes it a good model for bimodal breath research. therefore, recent research has focused on the identification of relevant candidate genes. here, we performed whole genom ... | 2017 | 28327946 |
| purification and sequence characterization of chondroitin sulfate and dermatan sulfate from fishes. | chondroitin sulfate (cs) and dermatan sulfate (ds) were extracted and purified from skins or bones of salmon (salmo salar), snakehead (channa argus), monkfish (lophius litulon) and skipjack tuna (katsuwonus pelamis). size, structural sequences and sulfate groups of oligosaccharides in the purified cs and ds could be characterized and identified using high performance liquid chromatography (hplc) combined with orbitrap mass spectrometry. cs and ds chain structure varies depending on origin, but m ... | 2017 | 28091940 |
| nucleic acids digestion by enzymes in the stomach of snakehead (channa argus) and banded grouper (epinephelus awoara). | dietary nucleic acids (nas) were important nutrients. however, the digestion of nas in stomach has not been studied. in this study, the digestion of nas by enzymes from fish stomach was investigated. the snakehead pepsins (sp) which were the main enzymes in stomach were extracted and purified. the purity of sp was evaluated by sds-page and hplc. the snakehead pepsin 2 (sp2) which was the main component in the extracts was used for investigating the protein and nas digestion activity. sp2 could d ... | 2017 | 27531133 |
| detection of type i collagen fibrils formation and dissociation by a fluorescence method based on thioflavin t. | in this study, fibrillogenesis and thermal dissociation of pepsin-soluble collagen (psc), extracted from snakehead (channa argus) skin, were monitored by fluorescence method based on thioflavin t (th-t), where the accuracy and sensitivity were evaluated and compared with those of turbidity assay. the fluorescence method revealed the fibrillogenesis dynamics of collagen with better sensitivity, especially at nucleation and plateau stages. the melting temperature (tm) of psc was estimated to be 47 ... | 2016 | 27519293 |
| comparative transcriptome analysis between aquatic and aerial breathing organs of channa argus to reveal the genetic basis underlying bimodal respiration. | aerial breathing in fish was an important adaption for successful survival in hypoxic water. all aerial breathing fish are bimodal breathers. it is intriguing that they can obtain oxygen from both air and water. however, the genetic basis underlying bimodal breathing has not been extensively studied. in this study, we performed next-generation sequencing on a bimodal breathing fish, the northern snakehead, channa argus, and generated a transcriptome profiling of c. argus. a total of 53,591 micro ... | 2016 | 27318671 |
| genetic comparison of two color morphs of northern snakehead (channa argus) and chnannidae family. | relationships of two species of channa argus (northern snakeheads) named "bicolor type" and "white type", as well as other six channa species were investigated based on their partial sequence of mitochondrial dna 16s rrna genes in the present study. for the channa family, the average genetic distance was 0.0863 with the inter-species genetic distance ranged from 0.0173 to 0.1384, and the average intra-species genetic distance in the genus channa was estimated as 0.00273 (range: 0.0019 to 0.0038) ... | 2016 | 27245097 |
| complete genome sequence of the highly virulent aeromonas schubertii strain wl1483, isolated from diseased snakehead fish (channa argus) in china. | we sequenced the complete genome of the highly virulent aeromonas schubertii strain wl1483, which was isolated from diseased snakehead fish (channa argus) in china. the full genome sequence of a. schubertii wl1483 is 4,400,034 bp, which encodes 4,376 proteins and contains 195 predicted rna genes. | 2016 | 26798095 |
| mycobacterial infection in northern snakehead (channa argus) from the potomac river catchment. | | 2016 | 26471857 |
| pharmacokinetics of enrofloxacin in snakehead fish, channa argus. | the pharmacokinetics of enrofloxacin (ef) was investigated after single intravenous (i.v.) and oral (p.o.) dose of 10 mg/kg body weight (b.w.) in snakehead fish at 24-26 °c. the plasma concentrations of ef and its metabolite ciprofloxacin (cf) were determined by high-performance liquid chromatography. the plasma concentration-time data were described by an open two-compartment model for both routes. after intravenous administration, the elimination half-life (t1/2β ), area under the concentratio ... | 2016 | 26411498 |
| molecular identification and expression of the foxl2 gene during gonadal sex differentiation in northern snakehead channa argus. | channa argus is one of the most commercially important fish species in china. studies show that males of c. argus grow faster than females at the same age. in order to explore the sex differentiation mechanism of c. argus, we isolated the full length of the sex-related gene foxl2 cdna and analysed its expression patterns during gonadal sex differentiation. alignment of known foxl2 amino acid sequences from vertebrates confirmed the conservation of the foxl2 open reading frame, especially the for ... | 2015 | 26159319 |
| bioaccumulative characteristics of tetrabromobisphenol a and hexabromocyclododecanes in multi-tissues of prey and predator fish from an e-waste site, south china. | tetrabromobisphenol a (tbbpa) and hexabromocyclododecanes (hbcds) were analyzed in 12 tissues of prey (mud carp) and predator (northern snakehead) fish from an e-waste area, south china. the tbbpa concentrations in different tissues ranged from 0.03 to 2.85 ng/g wet weight (ww) in mud carp and 0.04 to 1.30 ng/g ww in northern snakehead. the concentrations of hbcds ranged from 0.07 to 96.9 ng/g ww in mud carp and 0.18 to 240 ng/g ww in northern snakehead. hbcd levels in tissues were correlated wi ... | 2015 | 25874430 |
| [polychlorinated biphenyls and their methylsulfonyl metabolites in fish from an electronic waste recycling site in south china: tissue distribution and human dietary exposure]. | in the present study, we determined polychlorinated biphenyls and their methylsulfonyl metabolites (meso2-pcbs) in the tissues of two fish species-mud carp and northern snakehead-from a natural pond in an electronic waste recycling site in the pearl river delta, southern china. the mean concentrations of pcbs (σ pcbs )varied from 560 to 10 462 ng x g(-1) wet weight, and from 580 to 50 492 ng x g(-1) wet weight in the tissues of mud carp and northern snakehead, respectively, with the highest leve ... | 2014 | 25826938 |
| calibrating snakehead diversity with dna barcodes: expanding taxonomic coverage to enable identification of potential and established invasive species. | detecting and documenting the occurrence of invasive species outside their native range requires tools to support their identification. this can be challenging for taxa with diverse life stages and/or problematic or unresolved morphological taxonomies. dna barcoding provides a potent method for identifying invasive species, as it allows for species identification at all life stages, including fragmentary remains. it also provides an efficient interim taxonomic framework for quantifying cryptic g ... | 2014 | 24915194 |
| species-specific bioaccumulation of halogenated organic pollutants and their metabolites in fish serum from an e-waste site, south china. | halogenated organic pollutants (hops)-including organochlorine pesticides (ocps), polychlorinated biphenyls (pcbs), polybrominated diphenylethers (pbdes), polybromobiphenyls (pbbs), dechlorane plus (dp), tetrabromobisphenol a (tbbpa), and hexabromocyclododecanes (hbcds) as well as pcb metabolites (methylsulfone [meso2-]) and hydroxylated (oh-) pcbs and oh-pbdes-were determined in the serum of mud carp and northern snakehead from an electronic-waste (e-waste) site in south china. the average conc ... | 2014 | 24859045 |
| population genetic diversity of the northern snakehead (channa argus) in china based on the mitochondrial dna control region and adjacent regions sequences. | genetic variation and population structure of northern snakehead (channa argus) from eight locations in china were investigated using mitochondrial dna control region and adjacent regions sequences. sequence analysis showed that there were 105 haplotypes in 260 individuals, 48 unique haplotypes and 57 shared haplotypes, but no common haplotype shared by all populations. as a whole, the haplotype diversity was high (h=0.989), while the nucleotide diversity was low (π=0.00482). amova analysis dete ... | 2015 | 24724976 |
| genetic diversity based on ssr analysis of the cultured snakehead fish, channa argus, (channidae) in china. | the snakehead fish channa argus is an important food fish in china. we identified six microsatellite loci for c. argus. these six microsatellite loci and four other microsatellite markers were used to analyze genetic diversity in four cultured populations of c. argus (sd, jx, hn, and zj) and determine their relationships. a total of 154 alleles were detected at the 10 microsatellite loci. the average expected and observed heterozygosities varied from 0.70-0.84 and 0.69-0.83, respectively, and po ... | 2014 | 24615092 |
| two molecular markers based on mitochondrial genomes for varieties identification of the northern snakehead (channa argus) and blotched snakehead (channa maculata) and their reciprocal hybrids. | the northern snakehead (channa argus) and blotched snakehead (channa maculata) and their reciprocal hybrids have played important roles in the chinese freshwater aquaculture industry, with an annual production in china exceeding 400 thousand tons. while these are popular aquaculture breeds in china, it is not easy to identify northern snakehead, blotched snakehead, and their hybrids. thus, a method should be developed to identify these varieties. to distinguish between the reciprocal hybrids (c. ... | 2015 | 24438305 |
| comparison of the northern snakehead (channa argus) and blotched snakehead (channa maculata) and their reciprocal hybrids (c. maculata ♀ × c. argus ♂ and c. argus ♀ × c. maculata ♂) based on complete mitochondrial dna sequences. | the complete mitochondrial dna of channa argus, channa maculata, c. maculate ♀ × c. argus ♂ and c. argus ♀ × c. maculata ♂ were sequenced to characterize and compare their mitochondrial genomes. the lengths were 16,558, 16,559, 16,558 and 16,559 bp respectively. start codon of 13 protein-coding genes was atg, except that coi was gtg. the control region of the mitogenome were 907, 908, 907 and 908 bp in c. argus, c. maculata and their reciprocal hybrids (c. argus ♀ × c. maculata ♂ and c. maculate ... | 2015 | 24409853 |
| risk assessment of trace elements in cultured freshwater fishes from jiangxi province, china. | the levels of trace elements (as, cd, cr, cu, fe, ni, pb, se, and zn) in eight species of cultured freshwater fishes from jiangxi province were determined by inductively coupled plasma-mass spectroscopy. all the studied trace element levels in fish muscles from jiangxi province did not exceed chinese national standard and european union standard, and they were often lower than previous studies. the calculated target hazard quotient values for all the studied trace elements in fish samples were m ... | 2014 | 24258771 |
| using compound-specific stable carbon isotope analysis to trace metabolism and trophic transfer of pcbs and pbdes in fish from an e-waste site, south china. | two fish species (mud carp and northern snakehead) forming a predator/prey relationship and sediment samples were collected from a pond contaminated by e-waste. the concentrations and stable carbon isotope ratios (δ(13)c) of individual polychlorinated biphenyl (pcb) and polybrominated diphenyl ether (pbde) congeners were measured to determine if compound-specific carbon isotope analysis (csia) could be used to provide insight into the metabolism and trophic dynamics of pcbs and pbdes. significan ... | 2013 | 23560888 |
| sex-dependent accumulation and maternal transfer of dechlorane plus flame retardant in fish from an electronic waste recycling site in south china. | knowledge is limited on sex-related accumulation and maternal transfer of dechlorane plus (dp) flame retardant in wildlife. in the present study, dp isomers were examined in liver and eggs of two fish species, northern snakehead and crucian carp, from an electronic waste recycling site in china. hepatic ∑dp (sum of syn- and anti-dp) concentrations ranged 260-1920 ng/g lipid in northern snakehead and 340-1670 ng/g in crucian carp, with significantly higher levels in males relative to females. ∑dp ... | 2013 | 23500052 |
| the complete mitochondrial genome of channa argus, channa maculata and hybrid snakehead fish [channa maculata (♀) × channa argus (♂)]. | we sequenced and characterized the complete mitochondrial genome of channa argus, channa maculata and their hybrid [c. maculata (♀) and c. argus (♂)]. all the three mitochondrial genomes contained the typical complement of 13 protein-coding genes, 22 transfer rnas (trnas), 2 ribosomal rnas (rrnas) and 1 control region. the entire mitochondrial dna (mtdna) molecule of c. maculata was 16,559 bp long while the complete mtdna molecule of c. argus and hybrid snakehead fish was 16,558 bp long. this is ... | 2013 | 23316807 |
| arsenic contamination in the freshwater fish ponds of pearl river delta: bioaccumulation and health risk assessment. | this study investigated the extent of arsenic (as) contamination in five common species of freshwater fish (northern snakehead [channa argus], mandrarin fish [siniperca chuatsi], largemouth bass [lepomis macrochirous], bighead carp [aristichthys nobilis] and grass carp [ctenopharyngodon idellus]) and their associated fish pond sediments collected from 18 freshwater fish ponds around the pearl river delta (prd). the total as concentrations detected in fish muscle and sediment in freshwater ponds ... | 2013 | 23247527 |
| methylsulfonyl polychlorinated biphenyls in fish from an electronic waste-recycling site in south china: levels, congener profiles, and chiral signatures. | great concerns have been raised about the fate and effects of polychlorinated biphenyls (pcbs) and other organic contaminants contained in electronic waste (e-waste) exported from industrialized countries at midlatitudes to subtropical and tropical regions. information on the metabolites of these chemicals, for example, methylsulfonyl-pcbs (meso(2)-pcbs) in wildlife from the later regions is scarce. in the present study, 17 meso(2)-pcbs, including five chiral congeners, were detected in the musc ... | 2012 | 22927054 |
| posthodiplostomum sp. metacercariae in the trunk muscle of northern snakeheads (channa argus) from the fushinogawa river, yamaguchi, japan. | the northern snakehead channa argus, native to china, russia and korea, is currently found widespread throughout japan following its original introduction during the 1920s. a parasitological study of 10 snakeheads fished from the fushinogawa river running through yamaguchi city, japan, detected 2-101 (average, 23.7) metacercariae per 100 g of trunk muscle from each fish. the trematode was identified as metacercariae of posthodiplostomum sp. (strigeidida: diplostomidae) morphologically and charac ... | 2012 | 22673085 |
| effect of meal size on the specific dynamic action of the juvenile snakehead (channa argus). | the effect of meal size on the specific dynamic action (sda) of the juvenile snakehead (channa argus) was assessed at 25 °c. the fish were fed with test diets at meal sizes of 0.5, 1, 2, 3, 4, and 5% body mass and the postprandial oxygen consumption rate was determined at 1-h intervals until it returned to the pre-prandial level. the peak metabolic rate increased from 237.4 to 283.2 mg o(2) kg(-1) h(-1) as the relative meal size increased from 0.5% to 3% and leveled off at 4% and 5%. factorial m ... | 2012 | 22230184 |
| the complete mitogenome of the snakehead channa argus (perciformes: channoidei): genome characterization and phylogenetic implications. | to better understand the phylogenetic status of the snakehead, channa argus, we determined its complete mitogenome sequence using long-polymerase chain reaction and the direct sequencing method. the complete mitogenome sequence was 16,559 bp in length and contained 13 protein-coding genes, 2 rrna genes, 22 trna genes, and 1 control region (d-loop), the gene composition/order of which was identical to that observed in most other vertebrates. this was the first report of the mitogenome sequence in ... | 2011 | 22040081 |
| biota-sediment accumulation factors for dechlorane plus in bottom fish from an electronic waste recycling site, south china. | biota-sediment accumulation factors (bsafs) for dechlorane plus (dp), a highly chlorinated flame retardant, were determined in three bottom fish species, i.e., crucian carp, mud carp, and northern snakehead from an electronic waste recycling site in south china. the average bsafs are 0.007, 0.01, and 0.06 for syn-dp, and 0.003, 0.025, and 0.001 for anti-dp in crucian carp, mud carp, and northern snakehead, respectively, suggesting low bioaccumulation potential of dp isomers in these fish. howeve ... | 2011 | 21705082 |
| health risk assessment of organochlorine contaminants in fish from a major lake (baiyangdian lake) in north china. | organochlorine contaminants (ocs) in fish were determined to evaluate the potential risk to humans consuming fish originating in baiyangdian lake, north china. relatively low levels of pcbs, hchs and ddts were observed, with mean concentrations ranging from 0.28 to 3.28 ng/g, wet weight. among various fish species tested, the highest burden of ocs was recorded in northern snakehead (7.39 ng/g, wet weight) and the lowest was in grass carp (2.04 ng/g, wet weight). the hazard ratios (hrs), based on ... | 2011 | 21516458 |
| study on pepsinogens and pepsins from snakehead (channa argus). | three pepsinogens (pg1, pg2, and pg3) were highly purified from the stomach of freshwater fish snakehead (channa argus) by ammonium sulfate fractionation, anion exchange, and gel filtration. two-dimensional gel electrophoresis and native-page analysis revealed that their molecular masses were 37, 38, and 36 kda and their isoelectric points 4.8, 4.4, 4.0, respectively. all of the pepsinogens converted into their active form pepsins under ph 2.0 by one-step pathway or stepwise pathway. the three p ... | 2009 | 19877637 |
| molecular cloning of rhamnose-binding lectin gene and its promoter region from snakehead channa argus. | lectins are sugar-binding proteins that mediate pathogen recognition and cell-cell interactions. a rhamnose-binding lectin (rbl) gene and its promoter region have been cloned and characterized from snakehead channa argus. from the transcription initiation site, snakehead rhamnose-binding lectin (shl) gene extends 2,382 bp to the end of the 3' untranslated region (utr), and contains nine exons and eight introns. the open reading frame (orf) of the shl transcript has 675 bp which encodes 224 amino ... | 2010 | 19326250 |
| [parasite fauna of the snakehead channa argus warpachowskii from primorsky krai]. | parasite fauna of the snakehead channa argus warpachowskii was studied in water bodies of primorsky krai. thirty-one parasite species were recorded in this host from the studied area according to original and literary data. most part of these species are host-specific parasites of snakehead originated from chinese-indian region or parasites having a wide host range and able to infest almost all freshwater fishes. moreover, three brackishwater species of parasites were found in the fishes introdu ... | 2008 | 18825924 |
| tissue distribution of organochlorine pesticides in fish collected from the pearl river delta, china: implications for fishery input source and bioaccumulation. | fish tissues from different fishery types (freshwater farmed, seawater farmed and seawater wild) were analyzed for organochlorine pesticides (ocps), with the aim to further our understanding of bioaccumulation, and reflect the state of different fishery environments. significantly higher sigmaocp levels were found in seawater farmed fish than others, and among three freshwater farmed species, the lowest levels occurred in filter-feeding fish (bighead carp). liver contained the highest sigmaocp l ... | 2008 | 18063460 |
| [life cycles of the trematode species azygia hwangtsiytii and a. robusta (azygiidae) in primorsky territory]. | as a result of experimental and faunistic investigations it is established that the development of the trematode species azygia hwangtsiytii tsin, 1933 in primorsky territory is realized in the first intermediate host, snail cipangopaludina ussuriensis, and in second hosts, fishes perccottus glehni and channa argus warpachowskii, which can serve as transit, as well as final hosts. for azygia robusta odhner, 1911 terms of the development in the first intermediate host, snail anisus centrifugus ar ... | 2007 | 16134782 |
| resting metabolism and heat increment of feeding in mandarin fish (siniperca chuatsi) and chinese snakehead (channa argus). | resting metabolism was measured in immature mandarin fish siniperca chuatsi weighing 42.1-510.2 g and chinese snakehead channa argus weighing 41.5-510.3 g at 10, 15, 20, 25, 30 and 35 degrees c. heat increment of feeding was measured in mandarin fish weighing 202.0 (+/-14.0) g and snakehead weighing 200.8 (+/-19.3) g fed swamp loach misgurnus anguillicaudatus at 1% body weight per day at 28 degrees c. in both species, weight exponent in the power relationship between resting metabolism and body ... | 2000 | 11064280 |
| autonomic nervous control of the circulatory system in the air-breathing fish channa argus. | the control of the cardiovascular system with particular emphasis on the regulation of blood distribution in the gills and air-breathing organ was studied in the air-breathing teleost channa argus. perfused head preparations were used in addition to experiments with isolated strip preparations of arteries and heart chambers. the distribution of adrenergic nerves was investigated using falck-hillarp fluorescence histochemistry. this preliminary study shows an adrenergic control system composed of ... | 1986 | 2873952 |
| blood oxygen levels and acid-base status following air exposure in an air-breathing fish, channa argus: the role of air ventilation. | 1. acute air exposure of an air-breathing fish channa argus immediately induced hypercapnic acidemia while total co2 content of blood remained unchanged. upon reimmersion, paco2 and pha quickly restored to pre-exposure levels followed by gradual rise of [hco-3]. 2. artificial air ventilation of air-exposed fish restored acid-base status and greatly depressed voluntary air ventilatory movements. we conclude that the major cause of acid-base disturbances occurring during air exposure is the reduce ... | 1983 | 6132723 |