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differences in susceptibility of the european eel (anguilla anguilla) and the japanese eel (anguilla japonica) to the swim-bladder nematode anguillicola crassus.the swim-bladder nematode anguillicola crassus originates from the far east where it is a parasite of the japanese eel (anguilla japonica). after a. crassus was introduced to europe, it became a predominant parasite of the european eel (anguilla anguilla). a study performed with experimentally infected eels (98 days, 23 degrees c) revealed significant differences in the susceptibility of the two eel species to this parasite. the recovery rate of 30 administered infective a. crassus larvae (l3) f ...200415521638
[seasonal dynamics of the component community structure of parasites of the minnow phoxinus phoxinus (l.)].the material represented by 75 specimens of minnow of the age 2-2(+) was collected according to the standard technique in the chovju river (tributary of the vychegda river, a region of the settlement nizniy chov, district of syktyvkar town) during the period june-september 2000. the quantitative estimation of the structure of the component parasite communities was performed by calculating errors of the equation of regression for each species group separately, with subsequent summarizing of means ...200415553771
localization of the vacuolar-type atpase in swimbladder gas gland cells of the european eel (anguilla anguilla).the vacuolar atpase is a multifunctional enzyme that consists of several subunits. subunit b is part of the catalytic domain of the enzyme and is present in two isoforms in fish as well as in mammals. possibly, these two isoforms - vatb1 (kidney isoform) and vatb2 (brain isoform) - serve different functions. a localization of the two isoforms was attempted in swimbladder gas gland cells of the european eel anguilla anguilla by immunohistochemistry. two antibodies were produced by immunization of ...200312502767
long-term investigation of the composition and richness of intestinal helminth communities in the stocked population of eel, anguilla anguilla, in neusiedler see, austria.data from a long-term study of the intestinal helminth parasite community of eels, anguilla anguilla, stocked into the shallow eutrophic neusiedler see, austria, were collected over an 8 year period (1994-2001). in total, 720 eels from 2 sampling sites were examined. the parasite community showed characteristics similar to those in the natural eel populations in rivers of the uk and mainland europe: it was species poor, with only 5 species (acanthocephalus lucii, acanthocephalus anguillae, raphi ...200515727068
bioaccumulation and the effects of organochlorine pesticides, pah and heavy metals in the eel (anguilla anguilla) at the camargue nature reserve, france.pesticides (organochlorines-oc), polycyclic aromatic hydrocarbons (pah) and heavy metals are toxic to fish and may be taken in through gills, skin and contaminated foods. here we measure concentrations of oc, pah and heavy metals, and their effects in the eel anguilla anguilla from three locations in the camargue reserve in southern france. the camargue biosphere reserve is the largest coastal wetland in western europe, and a. anguilla is a common predator at the top of the food chain. livers an ...200515967515
physiological responses to acute temperature increase in european eels anguilla anguilla infected with anguillicola crassus.the swimbladder parasite, anguillicola crassus has infected, and spread rapidly, through european eel anguilla anguilla (l.) populations over the past 20 to 25 yr. our aim in the present studies was to elucidate whether the presence of a. crassus in these eels alters their rapid physiological responses to an acute temperature increase, compared to the response of uninfected fish. both infected and uninfected fish showed significant increases in plasma cortisol after 2 h at a raised environmental ...200515997820
heavy metal profile in five fish species included in human diet, domiciled in the end flow of river neretva (croatia).concentration of three heavy metals (mercury (hg), lead, (pb), and cadmium, (cd)) and one metalloid (arsenic [as]), were determined by atomic absorption spectrophotometry in five tissues (muscles, liver, kidneys, gills, and gonads) of five fish species (carp-cyprinus carpio, tench-tinca tinca, sval-leuciscus svallizi, gray mullet-mugil cephalus, and eel-anguilla anguilla) taken out from the end fiow (last 20 km) of the river neretva, south croatia, in the wider region of town metković, during th ...200616453065
epidemiology of anguillicola crassus in the european eel (anguilla anguilla) from two rivers in southern england.european eels anguilla anguilla from the rivers thames and test, in the south of england, were examined between 2000 and 2003 for infection with the swim-bladder nematode anguillicola crassus. since its introduction to thames eels at tidal estuarine locations circa 1987, a. crassus has become established in non-tidal freshwater stretches upriver and data from these locations are reported for the first time. the prevalence of infection at thames estuary locations was higher during 2000-2003 than ...200515977905
sandwich immunoassay for determination of vitellogenin in golden grey mullet (liza aurata) serum as a field exposure biomarker.vitellogenin (vtg) is a protein produced in the liver of oviparous animals in response to oestrogens. abnormal production of vtg by males, therefore, is used as a biological indicator of exposure to xeno-oestrogens. in this study, a sandwich-elisa for measuring vtg in liza aurata (golden grey mullet) was developed and validated. plasma vtg was purified from 17beta-oestradiol-injected immature individuals of mullet, by size-exclusion and ion-exchange chromatography. polyclonal antibodies against ...200515756602
characterization of sugar binding by osteoclast inhibitory lectin.osteoclast inhibitory lectin (ocil) is a membrane-bound c-type lectin that blocks osteoclast differentiation and, via binding to its cognate receptor nkrp1d, inhibits natural killer cell-mediated cytotoxicity. ocil is a member of the natural killer cell receptor c-type lectin group that includes cd69 and nkrp1d. we investigated carbohydrate binding of soluble recombinant human and mouse ocil in enzyme-linked immunosorbent assay-based assays. ocil bound immobilized high molecular weight sulfated ...200415123656
anguillicolosis: dynamics of the infection over two decades.the dynamics of the infection of the european eel anguilla anguilla l. by the asian nematode anguillicola crassus kuwahara, niimi and itagaki, 1974 (i.e. anguillicolosis) was monitored over 2 decades in an oligohaline canal in southern france (camargue, mediterranean coast). since the first mention of the parasite in this canal in 1985, which was also the first record in france, prevalence of pre-adult and adult forms has risen from 32 to 73%. however, during the last 7 yr (1997 to 2003), preval ...200415672878
stable isotope analyses provide new insights into ecological plasticity in a mixohaline population of european eel.recent studies have shown that anguillid eel populations in habitats spanning the marine-freshwater ecotone can display extreme plasticity in the range of catadromy expressed by individual fishes. carbon and nitrogen stable isotope analysis was used to differentiate between european eels (anguilla anguilla) collected along a short (2 km) salinity gradient ranging from <1 per thousand to approximately 30 per thousand in lough ahalia, a tidal atlantic lake system. significant differences were reco ...200516025352
the catadromous european eel anguilla anguilla (l.) as a model for freshwater evolutionary ecotoxicology: relationship between heavy metal bioaccumulation, condition and genetic variability.understanding the effects of pollutants on the genome is of crucial importance to preserve the evolutionary potential of endangered natural populations. the highly vagile european eel (anguilla anguilla l.) has suffered a dramatic decline in recruitment since two decades, urging for a better understanding of the genetic impact of pollution. its catadromous life history constitutes a model to assess local selection of pollutants on condition and genetic variability, as juveniles recruit in europe ...200515892996
accumulation of the precious metals platinum, palladium and rhodium from automobile catalytic converters in paratenuisentis ambiguus as compared with its fish host, anguilla anguilla.the platinum group metals (pgm) pt, pd and rh are emitted into the environment mainly by catalytic exhaust gas converters of cars. as pgm accumulate in sediments of aquatic ecosystems, the study was focused on the uptake of the noble metals by european eels, anguilla anguilla infected with the acanthocephalan paratenuisentis ambiguus. eels were exposed to ground catalytic converter material for six weeks. after exposure pt and pd were detected in the liver and kidney of the eels and in the paras ...200515831118
genetic population structure of fishes: implications for coastal zone management.the pattern for distribution of genetic variation within and between populations is referred to as the genetic population structure of the species. to avoid depletion of genetic resources sustainable management should be based on knowledge of this structure. we discuss key aspects of genetic population structure in the context of identifying biological units for fisheries management, suggesting three basic types of structuring: distinct populations; continuous change; and no differentiation. the ...200515865307
european eels, anguilla anguilla (l.), infected with anguillicola crassus exhibit a more pronounced stress response to severe hypoxia than uninfected eels.the parasite, anguillicola crassus is a non-native species that infects naive european eels, anguilla anguilla, and causes pathological damage to the swimbladder, potentially compromising their ability to cope with hypoxic conditions. this study aimed to elucidate whether anguillicolosis exacerbates the stress responses to exposure to hypoxic water, conditions that have been implicated in mass mortalities of wild infected european eels. blood parameters in infected and uninfected eels were measu ...200516083448
anguilla anguilla l. oxidative stress biomarkers responses to copper exposure with or without beta-naphthoflavone pre-exposure.the redox cycling of heavy metals as well as their interactions with organic pollutants is a major contributor to the oxidative stress resulting from aquatic pollution. therefore, in order to evaluate beta-naphthoflavone (bnf), cu and bnf/cu-induced oxidative stress with single and subsequent exposures, research was carried out in european eel (anguilla anguilla l.). eel gill and kidney oxidative stress biomarker responses such as lipid peroxidation (lpo), glutathione peroxidase (gpx), catalase ...200516168750
selective supercritical fluid extraction to identify aged sediment-bound pcbs available for uptake by eel.a naturally contaminated sediment was partially extracted with selective supercritical fluid extraction (sfe) to remove a fraction of supposedly bioavailable pcbs from the matrix. eels (anguilla anguilla) were cultured in systems with untreated and pre-extracted sediment, respectively, and it was shown that the sfe treatment selectively removed bioavailable pcbs from the sediment, since relative biota-to-sediment accumulation factors (bsafs) for the eight studied pcb congeners were much lower in ...200616188355
radiodiagnostic method for studying the dynamics of anguillicola crassus (nematoda: dracunculoidea) infection and pathological status of the swimbladder in lake balaton eels.swimbladder changes resulting from anguillicola crassus infection of the european eel anguilla anguilla have been the subject of several studies reported in the literature. these investigations, however, studied exclusively the status of infection at a given point in time and did not deal with changes in swimbladder infection in eels suffering from anguillicolosis over a period of time. in this study, a. crassus-induced pathological changes were monitored in 78 eels naturally infected in lake ba ...200515900688
dynamics and predicted decline of anguillicola crassus infection in european eels, anguilla anguilla, in neusiedler see, austria.the eel population in neusiedler see has been maintained by regular massive stocking since 1958. after the establishment of the national park neusiedler see-seewinkel in 1993, eel stocking was prohibited and the population, together with the specific parasites of eels, was predicted to decline to extinction within 10 years. this investigation was undertaken to document the decline and extinction of the anguillicola crassus population in eels. from 1994 to 2001, 720 eels were collected from two s ...200515946398
occurrence of drug-resistant bacteria in two european eel farms.the occurrence of strains that are resistant to oxolinic acid, oxytetracycline, sulfamethoxazole-trimethoprim, and nitrofurantoin among heterotrophic bacteria, including human and fish pathogens, in two freshwater eel farms was investigated. high levels of individual- and multiple-drug-resistant bacteria were detected, although sampling events were not correlated with clinical outbreaks and drug therapy.200515933039
the selective expression of distinct fucosylated glycoproteins on murine t and b lymphocyte subsets.the putative expression of distinct terminally fucosylated glycoconjugates among murine lymphocyte subpopulations was sought using ulex europaeus agglutinin-i (uea-i) and anguilla anguilla agglutinin (aaa), each with a distinctive primary binding preference to type ii and type i blood group h oligosaccharide determinants, respectively. in newly born and adult mice, direct labeling of isolated lymphocyte subsets in suspension, as well as immunohistochemical assays were indicative of the age-regul ...200516323706
perfluorooctane sulfonic acid and organohalogen pollutants in liver of three freshwater fish species in flanders (belgium): relationships with biochemical and organismal effects.a perfluorooctane sulfonic acid (pfos) assessment was conducted on gibel carp (carassius auratus gibelio), carp (cyprinus carpio), and eel (anguilla anguilla) in flanders (belgium). the liver pfos concentrations in fish from the ieperlee canal (boezinge, 250-9031 ng/g wet weight, respectively) and the blokkersdijk pond (antwerp, 633-1822 ng/g wet weight) were higher than at the zuun basin (sint-pieters-leeuw, 11.2-162 ng/g wet weight) and among the highest in feral fish worldwide. eel from the o ...200515963371
effects of infection with anguillicola crassus and simultaneous exposure with cd and 3,3',4,4',5-pentachlorobiphenyl (pcb 126) on the levels of cortisol and glucose in european eel ( anguilla anguilla ).to investigate whether the stress response of european eels infected with anguillicola crassus is influenced by environmental pollutants, experimentally infected eels were exposed to cd and/or to 3,3', 4,4', 5-pentachlorobiphenyl (pcb 126). serum cortisol and glucose concentrations of these eels were monitored over a period of 103 days and were compared with data from infected, unexposed eels as well as with data from uninfected eels. additionally, the levels of cortisol were correlated with con ...200616209723
immunofluorescent detection of 8-oxo-dg and pah bulky adducts in fish liver and mussel digestive gland.development of methodologies to detect dna damage induced by pollutants is of increasing concern in marine ecotoxicology. we previously described an immunoperoxidase method for revealing 7,8-dihydro-8-oxodeoxyguanosine (8-oxo-dg) in marine organisms. in this work, the approach was extended to immunofluorescence detection and to the use of another antibody for polycyclic aromatic hydrocarbon (pah)-dna adducts. specimens of european eel (anguilla anguilla) and mediterranean mussel (mytilus gallopr ...200515710481
blood group antigen recognition by a streptococcus pneumoniae virulence factor.the streptococcus pneumoniae fucose utilization operon includes a gene encoding a virulence factor that belongs to family 98 in the glycoside hydrolase classification. this protein contains a c-terminal triplet of fucose binding modules that have significant amino acid sequence identity with the anguilla anguilla fucolectin. functional studies of these fucose binding modules reveal binding to fucosylated oligosaccharides and suggest the importance of multivalent binding. the high resolution crys ...200616987809
cryopreservation of european eel (anguilla anguilla) spermatozoa: effect of dilution ratio, foetal bovine serum supplementation, and cryoprotectants.the main aim of the present study was to investigate the effect of sperm freezing medium dilution ratio (1:1, 1:2, and 1:5 v/v), two cryoprotectants: dimethyl sulphoxide (me(2)so) and methanol (meoh), and the addition of foetal bovine serum (fbs) on the cryopreservation of european eel sperm. the effect of these factors was evaluated comparing post-thawing viability with fluorescent staining (hoechst bisbenzimide 33258) and the spermatozoa head morphometry, determined with computer-assisted morp ...200616712830
endocrine and metabolic changes in anguilla anguilla l. following exposure to beta-naphthoflavone--a microsomal enzyme inducer.anguilla anguilla l. were exposed during 24 and 48 h to 2.7 mum beta-naphthoflavone (bnf), a known microsomal enzyme inducer. the bnf effects on thyroid-stimulating hormone (tsh), free triiodothyronine (t3), free thyroxine (t4) and cortisol plasma levels were investigated. alterations on plasma glucose and lactate levels were also measured as an indication of energy-mobilizing hormones alterations. bnf showed to be able to decrease significantly a. anguilla plasma t4 levels, whereas tsh, t3 and ...200515607783
physiological and genetic responses of european eel (anguilla anguilla l.) to short-term chromium or copper exposure-influence of preexposure to a pah-like compound.anguilla anguilla l. (european eel) was exposed for 24 h to chromium (cr-100 microm and 1 mm) or copper (cu-1 and 2.5 microm), with or without a 24-h preexposure to beta-naphthoflavone (bnf-2.7 microm), a polycyclic aromatic hydrocarbon (pah)-like compound, simulating sequential exposure to pahs and heavy metals. plasma cortisol, thyroid-stimulating hormone (tsh), free triiodothyronine (t3), and free thyroxine (t4) were determined in order to assess the effects on endocrine function. plasma gluc ...200515712285
characterization of ev-2, a virus isolated from european eels (anguilla anguilla) with stomatopapilloma.a virus designated ev-2 has been isolated from external tumor tissue and internal organs of european eels (anguilla anguilla) with stomatopapilloma. it contains rna and is ether, acid, and temperature labile above 4 degrees c, and concentrated preparations agglutinate chicken and sheep erythrocytes. the addition of actinomycin d during the first 2.75 h of infection inhibits viral replication. as determined in sucrose gradients, the buoyant density of the virus is 1.19 g/cm(3). ev-2 has a moderat ...197916789177
enterotoxin/guanylin receptor type guanylyl cyclases in non-mammalian vertebrates.cyclic gmp is a ubiquitous intracellular second messenger produced by guanylyl cyclases (gcs). the enterotoxin/guanylin receptor type membrane gc (designated as gc-c in mammals) is activated by exogenous ligands such as heat-stable enterotoxins (sta), small peptides secreted by some pathogenic strains of escherichia coli which cause severe secretory diarrhea and also activated by endogenous ligands such as guanylin and uroguanylin. the sta/guanylin receptor type membrane gc, as well as other typ ...200515930822
influence of biological and ecological factors on the bioaccumulation of polybrominated diphenyl ethers in aquatic food webs from french estuaries.previous studies have shown the worldwide presence of six congeners of polybrominated diphenyl ethers (pbdes) in marine biota (bde-28, -47, -99, -100, -153 and -154). the objective of the present study was to document their presence, their level and their transfer in the food web of two major estuaries in france, the loire and the seine. pbdes were quantified in eight principal species from the loire, representing primary consumers (the bivalve scrobicularia plana), omnivores (the worm nereis di ...200616764911
effects of hcg as spermiation inducer on european eel semen quality.fish sperm quality has traditionally been estimated by subjective evaluation of motility and sperm concentration. alternative methods for evaluation of sperm quality have been developed in the last decade and enable estimation of spermatozoa head morphometry, membrane integrity and mitochondrial function. weekly injections of human chorionic gonadotropin (hcg) induced spermiation in farmed male european eels. the milt volume increased from the 5th to 12th weeks. sperm concentration significantly ...200616595151
biomarker responses in european eel (anguilla anguilla) exposed to persistent organic pollutants. a field study in the vaccarès lagoon (camargue, france).a screening of relevant biomarkers was carried out in order to evaluate metabolic and cellular damages in european eels exposed to a non-point source contamination by persistent organic pollutants (pop) such as polycyclic aromatic hydrocarbons (pah) and organochlorine compounds (oc) in a protected area, the nature reserve of camargue (france). investigations were focused on metabolic responses including detoxification mechanisms (biotransformation, antioxidant process), energy requirements and e ...200616714045
sexually mature european eels (anguilla anguilla l.) stimulate gonadal development of neighbouring males: possible involvement of chemical communication.this study was aimed to investigate whether sexual maturation of immature male eels could be stimulated indirectly by placing them in contact with either male (minj) or female (finj) eels in which sexual maturation had been stimulated directly by weekly injections of human chorionic gonadotropin (hcg) or salmon pituitary extract (spe), respectively. untreated males were placed either in the same tank or in a separate tank that was linked to the injected fish via a recirculation system. the hormo ...200616545383
anguilla anguilla l. genotoxic responses after in situ exposure to freshwater wetland (pateira de fermentelos, portugal).pateira de fermentelos is a cértima river enlargement, close to its river mouth (by the agueda river), where the introduction of agricultural chemicals such as fertilisers and pesticides, domestic sewage, as well as heavy metals from electroplating industries, results in increased water pollution. the present research work concerns a 48 h in situ exposure of caged eels (anguilla anguilla l.) at the pateira de fermentelos. five exposure sites were selected, i.e., site a, site b, site c, site d an ...200616483656
the swimbladder nematode anguillicola crassus in the european eel anguilla anguilla and the japanese eel anguilla japonica: differences in susceptibility and immunity between a recently colonized host and the original host.the swimbladder nematode anguillicola crassus originates from asia where it is a parasite of the japanese eel anguilla japonica. after its introduction to europe about 25 years ago, the parasite spread rapidly within the indigenous populations of the european eel anguilla anguilla and subsequently the prevalence and mean intensity appeared to stabilize. under experimental and aquaculture conditions the naïve new host appears to be more susceptible to a. crassus compared to the original host. bot ...200616768856
metal and metallothionein content in tissues from wild and farmed anguilla anguilla at commercial size.metallothionein and metal content (cd, zn, hg, cu, fe, pb and mn) were determined in various organs of commercially available eel (anguilla anguilla) of similar size obtained from a local farm and from the albufera lake in valencia (spain). farmed fish showed statistically significant higher cd concentrations in liver and kidney whereas wild individuals had higher levels of pb in blood and zn in kidney. significant positive correlations were found between metallothionein and cd in kidney of farm ...200717157913
parasite fauna of selected fish species of lake miedwie.a total of 136 fishes, representing 9 species (perch, perca fluviatilis l.; pike, esox lucius l.; european eel, anguilla anguilla (l.); common bream, abramis brama (l.); roach, rutilus rutilus (l.); tench tinca tinca (l.); european whitefish, coregonus lavaretus (l.); vendace, coregonus albula (l.); and zander, sander lucioperca (l.)), from lake miedwie were studied within 1997-1999. the necropsies yielded 41 parasite species (taxa). the most diversified were parasite faunas of pike (19 parasite ...200216888943
oxidative stress and genotoxic effects in gill and kidney of anguilla anguilla l. exposed to chromium with or without pre-exposure to beta-naphthoflavone.fish in the aquatic environment can be subjected to a multipollution state and the occurrence of sequential exposures is an important aspect of eco-toxicological research. in this context, a preceding exposure can affect a toxic response to a subsequent exposure. therefore, the current study was based on sequential exposures, viz. to a pah-like compound (beta-naphthoflavone, bnf) followed by a heavy metal (chromium, cr), focusing on the assessment of oxidative stress responses and their role in ...200616784884
anguillicola papernai (nematoda: anguillicolidae) and other helminths parasitizing the african longfin eel anguilla mossambica.the swim bladder nematode anguillicola papernai moravec & taraschewski, 1988 has been investigated as regards its occurrence in longfin eels anguilla mossambica (peters) in rivers in south africa. a. papernai revealed a prevalence of around 50% and a mean intensity of about 6 adult worms at 1 sampling site but were less abundant in 3 others. field observations suggest a more narrow habitat preference than that of anguillicola crassus and a seasonal pattern of abundance. african longfin eels harb ...200515819434
the dynamics of the nematode anguillicola crassus, kuvahara 1974 in eel anguilla anguilla (l. 1758) in the sebou estuary (morocco).the european eel is a vulnerable fish by its complex life cycle, by the impact of pollution of the near total of freshwater aquatic environments, and by the gravity and the diversity of its parasites (nematodes, cestodes, trematodes, the copepoda, coccidia...). it is classified in the red book of threatened species. the anguillulose is the principal parasitic pathology of an eel either in the natural environment or in the aquaculture. the eels taken in the three zones of the sebou estuary of var ...200717096144
availability of in vitro vitellogenin assay for screening of estrogenic and anti-estrogenic activities of environmental chemicals.vitellogenin (vtg) protein, vtg mrna, other egg yolk proteins, vitelline envelope proteins and their mrnas are produced in the liver of oviparous species by stimulation of endogenous estrogen and exogenous estrogenic chemicals. the vtg assay based on enzyme-linked immunosorbent assay (elisa) has been widely used for many fish species to screen estrogenic and anti-estrogenic activities of chemicals and sewage effluents using immature fish and/or male fish. in order to reduce the number of fish fo ...200616883298
phylogenetic identification of aeromonas strains isolated from carcasses of pig as new members of the species aeromonas allosaccharophila.the first description of the species aeromonas allosaccharophila was only based on two strains (the type strain cect4199, and a duplicate cect4200) isolated from diseased elvers (anguilla anguilla) of an eel-farm located in valencia, spain, and one stool isolate (atcc35942) from a female with diarrhoea and food poisoning in south carolina, u.s.a. in the present study, 17 aeromonas isolates obtained from carcasses of pigs and from the equipment for the cleaning process, and one strain recently is ...200717080292
presence of lactobacilli in the intestinal content of freshwater fish from a river and from a farm with a recirculation system.lactobacilli are gram-positive and catalase negative rods commonly found in lactic acid fermented foods and in the gastrointestinal tract of mammals and birds. few studies have described lactobacilli in freshwater fish. we analysed the presence of lactobacilli in the intestines of young and adult freshwater fish inhabiting a river environment and from fish reared in an aquaculture unit with a water recirculation system. various species of lactobacilli were present in relatively high number in th ...200616943040
genotyping of marine viral haemorrhagic septicaemia virus isolated from the flemish cap by nucleotide sequence analysis and restriction fragment length polymorphism patterns.a total of 14 viral haemorrhagic septicaemia virus (vhsv) isolates obtained from greenland halibut reinhardtius hippoglossoides caught at the flemish cap, a fishing ground in the north atlantic ocean near newfoundland, were characterised using restriction fragment length polymorphism (rflp) and nucleotide sequence analysis. rflp analysis was performed on a 1259 bp fragment of the glycoprotein (g) gene, and a 305 nucleotide region within the nucleoprotein (n) gene was used for sequence analysis. ...200617240749
spatio-temporal dynamics of the nematode anguillicola crassus in northeast tunisian lagoons.anguillicola crassus, parasite nematode of the european eel anguilla anguilla, was recorded for the first time in tunisia (1999) in the ichkeul lagoon. its distribution has since spread toward bizerte and ghar el melh lagoons. the monthly epidemiological survey reveals that a. crassus exists throughout the year in the ichkeul lagoon. in this lagoon, its prevalence is low in winter (12% in december), with a marked increases in the spring reaching a maximum in march (35%), before it starts to decr ...200617027639
direct calorimetry of free-moving eels with manipulated thyroid status.in birds and mammals, the thyroid gland secretes the iodothyronine hormones of which tetraiodothyronine (t4) is less active than triiodothyronine (t3). the action of t3 and t4 is calorigenic and is involved in the control of metabolic rate. across all vertebrates, thyroid hormones also play a major role in differentiation, development and growth. although the fish thyroidal system has been researched extensively, its role in thermogenesis is unclear. in this study, we measured overall heat produ ...200717082966
parasite fauna of the eel, anguilla anguilla (linnaeus, 1758), from the polish part of the vistula lagoon.eel is one of the most valuable commercial fish species of the vistula lagoon. for this reason its infection by non-indigenous species of parasites is the subject of the interest of sciencists.200617120993
parasite fauna of the european eel (anguilla anguilla l, 1758) from the russian part of the vistula lagoon (baltic sea).the european eel is one of the major fishing objects of the russian fishery zone of the vistula lagoon (baltic sea). this is the reason that its parasite fauna was studied within 1998-2005.200617120994
characteristics of the peripheral blood of the anguillicola crassus (kuwahara, niimi et tagaki, 1974) and trypanosoma granulosum laveran et mesnil, 1902 infested eel (anguilla anguilla l.) ascending the river rega (north-western poland).the study was aimed at characterising the peripheral blood of eel (anguilla anguilla l.) ascending the river rega and infested with anguillicola crassus (kuwahara, niimi et itagaki, 1974) and trypanosoma granulosum laveran et mesnil, 1902. material and methods: haematological assays were performed on 58 eel individuals caught in august and september 2001 and in july 2002. the nematode anguillicola crassus was identified in the swim bladder lumen of 44 eel individuals. the mean infestation intens ...200718441878
the pathogenic helminth parasites of eels.although 63 and 55 species of helminths have been reported from each species of atlantic eel and from 29 to 19 for each species of pacific eel only the monogeneans pseudodactylogyrus bini and p. anguillae and the nematode anguillicola crassus, originally specific to species of pacific eels, can be considered serious pathogens. none of the three are normally pathogenic to their preferred natural eel host species in the wild. pseudodactylogyrus spp. only cause serious local gill damage when presen ...200717498176
nematodes of the intestine and swimbladder of the european eel anguilla anguilla (l.) ascending pomeranian rivers.the study focused on the eel (length and weight averaging 23.1 cm and 13.7 g, respectively) ascending pomeranian rivers in summers of 1999 - 2003. the swim bladder was examined in 322 individuals, the intestine being examined in 272 fish. anguillicola crassus was present in the swim bladder of 184 fish. infection prevalence varied between the rivers, the highest prevalence being recorded in the eel caught in the radew (65.6%) and the lowest in the wieprza (41.7%). the intensity of infection was ...200416892600
occurrence of edwardsiella tarda in wild european eels anguilla anguilla from mediterranean spain.pure cultures of edwarsiella tarda were isolated from body ulcers and internal organs of wild european eels caught in a mediterranean freshwater coastal lagoon (albufera lake, valencia, spain) over a 1 yr period. overall, the e. tarda isolation rate from wild eels was 9%, but this increased to 22.8% in diseased individuals. all 22 e. tarda isolates belonged to the 'wild-type' biogroup of the species and were virulent for eels (lethal dose that kills 50% of exposed individuals [ld50 dose]: 10(4.8 ...200617240756
anguilla anguilla l. oxidative stress biomarkers: an in situ study of freshwater wetland ecosystem (pateira de fermentelos, portugal).pateira de fermentelos (pf) is a natural freshwater wetland in the central region of portugal. in the last decade, the introduction of agricultural chemicals, heavy metals, domestic wastes, as well as eutrophication and incorrect utility of resources resulted in an increased water pollution. the present research work was carried out to check the various oxidative stress biomarker responses in european eel (anguilla anguilla l.) gill, kidney and liver due to this complex water pollution. eels wer ...200616725179
dioxins and dioxin-like pcbs in different fish from the river elbe and its tributaries, germany.in a long-term program polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (pcdd/fs) as well as dioxin-like polychlorinated biphenyls (dl-pcbs) were analyzed in the muscle tissue of eels (anguilla anguilla), bream (abramis brama), european chub (leuciscus cephalus) and ide (leuciscus idus) from the river elbe and its tributaries mulde and saale. the variation of the pcdd/f and dl-pcb concentrations in all fish samples is very large, whereby the dl-pcbs predominate in comparison t ...200717382467
detection of hexabromocyclododecane and its metabolite pentabromocyclododecene in chicken egg and fish from the official food control.during routine gas chromatography with electron capture detection (gc/ecd) analysis of chicken eggs, we observed that the most prominent peak in some samples did not match the retention time of any of the food contaminants screened. subsequent gc coupled with mass spectrometry (gc/ms) studies clarified that the mass spectrum of the peak was very similar to hexabromocyclododecane (hbcd), which was also identified by gc/ms in the egg. the unknown compound was positively identified as pentabromocyc ...200717419640
effects of ph, sodium bicarbonate, cryoprotectants and foetal bovine serum on the cryopreservation of european eel sperm.the main objective of the present study was to evaluate the influence of ph and bicarbonate concentration in the activation or inhibition of european eel (anguilla anguilla) spermatozoa and to evaluate the effect of different cryoprotectants: dimethyl sulphoxide (dmso), acetamide, ethylene glycol, propanol, glycerol and methanol (meoh). the effect of these factors was evaluated comparing the percentage of motile cells, the percentage of alive cells (by hoechst staining) and the spermatozoa morph ...200818199265
quality attributes of farmed eel (anguilla anguilla) stored under air, vacuum and modified atmosphere packaging at 0 degrees c.the shelf life of fresh eel in various packaging conditions of atmospheric air, vacuum and modified atmosphere packaging (map) (40% co(2), 30% n(2) and 30% o(2)) at 0 degrees c was investigated. all raw eel samples received acceptable sensory scores during the first 11+/-1 days of storage in atmospheric air, 11+/-1 days of storage in vacuum and finally 18+/-1 days of storage in map conditions. using the microbial quality indicators the shelf life of eel packed in air, vacuum and map was estimate ...200717613370
biochemical characterization of a s-glutathionylated carbonic anhydrase isolated from gills of the antarctic icefish chionodraco hamatus.gill cytoplasmic carbonic anhydrase of the haemoglobinless antarctic icefish chionodraco hamatus (ice-ca) was directly sequenced and consists in 259 residues with an acetylated n-terminus. the molecular mass, deduced from the sequence, was 28.45 kda, while mass spectrometry analysis of the native protein gave higher values. treatment with dithiothreitol abolished this difference, indicating possible post-translational modifications. isoelectric focusing analysis of ice-ca suggested s-thiolation, ...200717510781
methylmercury bioconcentration in muscle tissue of the european eel (anguilla anguilla) from the adour estuary (bay of biscay, france). 200717543349
element concentrations in the swimbladder parasite anguillicola crassus (nematoda) and its host the european eel, anguilla anguilla from asi river (hatay-turkey).the european eel's swimbladder nematode, anguillicola crassus, sampled from the asi river (orontes river) in antakya (hatay, turkey) in may 2006 were analysed by inductively coupled plasma-atomic emission spectrometry (icp-aes) for their some heavy metal (cd, cr, cu, fe, hg, mn, pb and zn) levels. the metal concentrations of the parasites were compared to different organs (swimbladder, liver, muscle and skin) of the fish hosts. the parasite contained statistically highly significantly amounts of ...200817661155
do eel parasites reflect the local crustacean community? a case study from the rhine river system.in 2003, the parasite fauna of 197 european eels anguilla anguilla, captured at three different locations (laufenburg, karlsruhe and beneeden leeuwen) in the river rhine, was analysed. the eels harboured a total of 18 species, among them the protozoa (myxidium giardi, myxobolus kotlani and trypanosoma granulosum), acanthocephalans (acanthocephalus anguillae, acanthocephalus lucii, echinorhynchus truttae, pomphorhynchus laevis), nematodes (paraquimperia tenerrima, pseudocapillaria tomentosa, cama ...200717578598
vaccination of eels (anguilla japonica and anguilla anguilla) against anguillicola crassus with irradiated l3.the original host of the swimbladder nematode anguillicola crassus, the japanese eel (anguilla japonica) and the recently colonized european eel (anguilla anguilla) were immunized with 40 irradiated (500 gy) 3rd-stage larvae (l3) of this parasite and challenged with an infection of 40 normal l3. the immunization induced a significant reduction of the number of adult worms developing from the challenge infection in a. japonica, but not in a. anguilla. the induced resistance (calculated using the ...200818302804
heavy metal distribution in tissues of six fish species included in human diet, inhabiting freshwaters of the nature park "hutovo blato" (bosnia and herzegovina).the aim of the study was to quantify heavy metal (mercury, lead, cadmium, and arsenic) concentration in tissues (muscles, liver, kidney, gills, and gonads) of six fish species (carp: cyprinus carpio, tench: tinca tinca, pumpkinseed: lepomis gibosus, prussian carp: carassius auratus gibelio, hasselquist: salmo dentex, eel: anguilla anguilla) from the freshwaters of the nature park hutovo blato, bosnia and herzegovina, and determine whether they are potentially harmful for human health if included ...200817687582
pathogenesis of herpesvirus anguillae (hva) in juvenile european eel anguilla anguilla after infection by bath immersion.a clinical infection in post-larval (glass) european eels anguilla anguilla was successfully induced after artificial bath immersion with herpesvirus anguillae (hva), isolated from diseased european eel. hva caused a clinical infection after 7 d post-inoculation (pi); virus was detected by polymerase chain reaction (pcr) from day 1 pi; virus isolation was positive from day 7 pi, and hva antigen was detected by immunohistochemistry in gills and stomach from day 4 pi. tissue changes were found by ...200718159668
helminth communities of european eels anguilla anguilla (linnaeus, 1758) from the vistula lagoon and puck bay, poland.within 2001-2002 a total of 621 eel anguilla anguilla (l., 1758) (488 from the vistula lagoon and 133 from the puck bay) were examined. fifteen parasite taxa were recovered: pseudodactylogyrus anguillae (yin et sproston, 1948), brachyphallus crenatus (rudolphi, 1802), deropristis inflata (molin, 1859), diplostomum spp., bothriocephalus claviceps (goeze, 1782), proteocephalus macrocephalus (creplin, 1825), anguillicola crassus (kuwahara, niimi et itagaki, 1974), camallanus lacustris (zoega, 1776) ...200516838624
european eel (anguilla anguilla l.) metallothionein, endocrine, metabolic and genotoxic responses to copper exposure.this study investigated anguilla anguilla (european eel) physiological and genotoxic responses to copper (cu) and their relation with metallothionein (mt) protection. eels were exposed during 7 days to cu 0.2 micromol/l. mt induction was assessed in gill and liver, revealing significant response only in liver. endocrine responses displayed a plasma free triiodothyronine (t3) and cortisol significant decrease, though the thyroid-stimulating hormone (tsh) and free thyroxine (t4) concentrations wer ...200818192012
parasite communities of eels anguilla anguilla in freshwater and marine habitats in iceland in comparison with other parasite communities of eels in europe.ninety-five eels from one marine and three freshwater localities in iceland were examined for parasites. twenty species were found, 12 from marine habitat, 12 from freshwater and 4 species were found in both habitats. these are: eimeria anguillae, chilodonella hexasticha, trichodina fultoni, t. jadranica, myxidium giardi, myxobolus kotlani, two zschokkella spp., derogenes varicus, deropristis inflata, diplostonmum sp., plagioporus angulatus, podocotyle atomon, anisakis simplex (larva), eustrongy ...200717886743
differential gene expression analysis in european eels (anguilla anguilla, l. 1758) naturally infected by macroparasites.we analyzed the relationships between the macroparasite community of the european eel and the expression of genes involved in the host physiology during its continental life. the genes studied are implicated in (1) host response to environmental stress, i.e., heat shock protein 70 (hsp70) and metallothionein (mt); (2) osmoregulation, i.e., beta thyroid hormone receptor (betathr) and na+/k+atpase; and (3) silvering, i.e., betathr, freshwater rod opsin (fwo), and deep-sea rod opsin (dso). all were ...200818605780
cadmium uptake by the european eel: trophic transfer in field and experimental investigations.due to its status of threatened species and being heavily contaminated by metals, the european eel (anguilla anguilla) was selected to investigate cadmium contamination levels of fish settled along a historically cadmium-contaminated hydrosystem, the garonne-gironde continuum (france), according to its various location sites and fish length. results have shown an important site effect on cadmium concentrations in liver but not in gills, highlighting the possible predominance of the trophic expos ...200818207239
migratory response of european eel (anguilla anguilla) phagocytes to the eel swimbladder nematode anguillicola crassus.the migratory response of peripheral blood granulocytes and monocytes from the european eel anguilla anguilla (l.) to infective larvae of the swimbladder nematode anguillicola crassus kuwahara, niimi and hagaki, 1974 was examined by means of light microscopical histology and with an in vitro assay using a modified boyden chamber. histological examination of experimentally infected eels revealed that, already 8 days postinfection, an infiltration of inflammatory cells around l3 of a. crassus in t ...200818311570
description of a new echinorhynchid species (acanthocephala) from the european eel, anguilla anguilla, in germany, with a key species of acanthocephalus in europe.acanthocephalus rhinensis n. sp. is described from the european eel. anguilla anguilla (linnaeus, 1758), collected in the rhine river near the city of karlsruhe, germany. it is the sixth species of acanthocephalus koelreuther, 1771 described from european fish. four other species are known from amphibians. the new species is distinguished from the other 5 species infecting fish by having a 1.2-mm-long proboscis armed with 15-21 rows of 13-16 hooks each, lemnisci about as long as receptacle, oblo ...200818576852
biased sex ratio in the european eel (anguilla anguilla) swim-bladder parasite anguillicola crassus, experimentally induced by 11-ketotestosterone.parasites are intimately connected to the host in which they live, and some may be affected by the polluted environment of their host. the present study describes the effect of a steroid hormone (11-ketotestosterone) on the sex ratio of the invasive hematophagous nematode anguillicola crassus kuwahara, niimi & itagaki, 1974, when experimentally injected to european eels, anguilla anguilla. our results showed that this steroid induced a significant male-biased ratio in the nematode a. crassus inf ...200818576815
perfluoroalkyl compounds in danish wastewater treatment plants and aquatic environments.this study reports the results of a screening survey of perfluoroalkyl compounds (pfcs) in the danish environment. the study included point sources (municipal and industrial wastewater treatment plants and landfill sites) and the marine and freshwater environments. effluent and influent water and sewage sludge were analysed for point sources. sediment, blue mussels (mytilus edulis) and liver from plaice (pleuronectes platessa), flounder (platichthys flesus) and eel (anguilla anguilla) were analy ...200818029290
endocrine and metabolic responses of anguilla anguilla l. caged in a freshwater-wetland (pateira de fermentelos--portugal).the present short-term in situ study was carried out in a freshwater-wetland--pateira de fermentelos--considered an enlargement of cértima river, in the centre of portugal. this ecosystem is an important fishing and recreation place, receiving effluents from different origins namely, electroplating industrial effluents containing heavy metals, domestic wastes, as well as pesticides and fertilizers resulting from agriculture activities. the aim of the present research work was to monitor the effe ...200717150242
experimental infection and detection of aphanomyces invadans in european catfish, rainbow trout and european eel.european catfish silurus glanis, european eel anguilla anguilla and rainbow trout oncorhynchus mykiss were challenged by intramuscular injection of zoospores of aphanomyces invadans, the oomycete associated with epizootic ulcerative syndrome (eus). the tropical three-spot gourami trichogaster trichopterus is known to be highly susceptible and was used as a positive control. european catfish were highly susceptible and rainbow trout had moderate to low susceptibility, whereas eels appeared largel ...200819244971
an investigation into the prevalence of renibacterium salmoninarum in farmed rainbow trout, oncorhynchus mykiss (walbaum), and wild fish populations in selected river catchments in england and wales between 1998 and 2000.a cross-sectional survey of renibacterium salmoninarum infection in farmed rainbow trout (rbt) and wild fish populations was carried out in 10 farms and six river catchments, respectively, in england and wales. the majority of the wild fish were sampled in 1998 and the farmed fish in 2000. grayling, thymallus thymallus, and brown trout, salmo trutta, were the main wild species sampled. two fish, one grayling and one salmon, salmo salar, were r. salmoninarum culture-positive, compared with 40 con ...200818234016
trace element concentrations in proteocephalus macrocephalus (cestoda) and anguillicola crassus (nematoda) in comparison to their fish host, anguilla anguilla in ria de aveiro, portugal.the use of some fish parasites as bioindicators of heavy metal pollution has been demonstrated as particularly adequate due to their capacity of bioconcentration. this study evaluated the effect of proteocephalus macrocephalus on the accumulation of trace elements in the edible fish, anguilla anguilla, in a contaminated area in portugal (ria de aveiro). also, the model p. macrocephalus/a. anguilla was assessed as a bioindicator system in the presence of the highly prevalent nematode anguillicola ...200919010518
glutathione transferases from anguilla anguilla liver: identification, cloning and functional characterization.glutathione transferases (gsts) constitute a class of detoxifying enzymes involved in phase ii metabolism. using gsh-affinity chromatografy followed by hplc analysis, two gst isoforms were isolated from the anguilla anguilla liver cytosol. the major gst belongs to the piscine-specific rho class and accounted for about 59% of total gst affinity eluted fraction, while the remaining 41% was represented by a pi class gst. both isoforms were cloned, heterologously expressed in escherichia coli and th ...200818804293
spatial variations and temporal trends between 1994 and 2005 in polychlorinated biphenyls, organochlorine pesticides and heavy metals in european eel (anguilla anguilla l.) in flanders, belgium.in flanders, the northern region of belgium, european yellow eel muscle tissue was used as an indicator of environmental and potential human dietary exposure by hazardous chemicals of surface waters and sediments. between 1994 and 2005, over 2800 eel captured at 365 stations were analysed for pcbs, pesticides and heavy metals. contamination of eel in flanders fell within the range of reported concentrations in other watersheds of western europe. a spatial analysis of the data demonstrated that t ...200817825968
brain-derived neurotrophic factor mrna expression in the brain of the teleost fish, anguilla anguilla, the european eel.the spatial expression pattern of brain-derived neurotrophic factor (bdnf) mrna in the brain of the european eel (anguilla anguilla) was determined using non-radioactive in situ hybridization, and mapped and compared to that of other vertebrates. riboprobes were prepared based on a partial cdna coding sequence for a. anguilla bdnf that was amplified using degenerate primers, cloned and sequenced. as in other animal groups, in the eel, bdnf mrna expression was seen in the telencephalon, hypothala ...200919246895
regulation of anguillicola crassus (nematoda) infrapopulations in their definitive host, the european eel, anguilla anguilla.the parasitic nematode anguillicola crassus was recently introduced into populations of the european eel, anguilla anguilla. we investigated, under experimental conditions, the regulation of a. crassus infrapopulations. we tested the effects of (1) the resource-limited habitat of the parasite and (2) the coexistence of several developmental stages in its niche (the swim-bladder) on the composition of the infrapopulations. the results revealed that the respective effects of these factors differed ...200818940021
population structure of the parasitic nematode anguillicola crassus, an invader of declining north atlantic eel stocks.probably half of all animal species exhibit a parasitic lifestyle and numerous parasites have recently expanded their distribution and host ranges due to anthropogenic activities. here, we report on the population genetic structure of the invasive nematode anguillicola crassus, a parasite in freshwater eels, which recently spread from asia to europe and north america. samples were collected from the newly colonized naive host species anguilla anguilla (europe) and anguilla rostrata (north americ ...200818727770
bioaccumulation of polychlorinated biphenyls in the eel (anguilla anguilla) at the camargue nature reserve - france.fish consumption is a potential source of human exposure to pollutants. here, we study residue levels of pcbs in the eel, anguilla anguilla, from the nature camargue reserve in southern france. chromatographic analysis (gc-ecd) found seventy identifiable congeners, among which, 10 are considered as dioxin-like pcbs, such as the non-ortho pcb 81 and the mono-ortho chlorobiphenyls pcb105, 114, 118, 123, 156, 157, 167, 170, 180. toxic equivalents (teq, who 2005 tef-toxic equivalent factors) varied ...200817900770
demonstration of bone resorbing cells in elasmobranchs: comparison with osteoclasts.we have previously shown that elasmobranchs-characterized by a partially calcified cartilaginous endoskeleton-presented a bony vertebral arch containing osteoblasts, osteocytes and resorbing cells. the aim of this study is to test the ability of elasmobranchs to resorb bone tissue. the subcutaneous implantation in dogfish (scyliorhinus canicula) of devitalized mineral-containing bone particles, obtained from a bony fish (the eel, anguilla anguilla) resulted, after 21 2 months, in the formation o ...198918620290
expression and functional characterization of four aquaporin water channels from the european eel (anguilla anguilla).the european eel is a euryhaline teleost which has been shown to differentially up- and downregulate aquaporin (aqp) water channels in response to changes in environmental salinity. we have characterized the transport properties of four aquaporins localized to osmoregulatory organs - gill, esophagus, intestine and kidney. by sequence comparison these four aqp orthologs resemble human aqp1 (eel aqp1), aqp3 (eel aqp3) and aqp10 (aqpe). the fourth member is a duplicate form of aqp1 (aqp1dup) though ...200919684221
gossypol affects ion transport in the isolated intestine of the seawater adapted eel, anguilla anguilla.cottonseed (gossypium sp.) meals are protein rich and inexpensive, but the presence of the polyphenolic dialdehyde, gossypol, is responsible of many toxic effects in animals including fishes. recently an effect on the transepithelial ion transport in rat colon has been demonstrated. in this study we investigated the effect of gossypol on the transepithelial electrical parameters of the isolated intestine of seawater adapted eel, anguilla anguilla, by employing a ussing chamber technique. we show ...200818606239
massive encapsulation of larval anguillicoloides crassus in the intestinal wall of japanese eels.abstract:200919832983
abundant expression and purification of biologically active mitochondrial citrate carrier in baculovirus-infected insect cells.heterologous expression of recombinant proteins is an essential technology for protein characterization. a major obstacle to investigating the biochemical properties of membrane proteins is the difficulty in obtaining sufficient amounts of functional protein. here we report the successful expression of the tricarboxylate (or citrate) carrier (cic) of eel (anguilla anguilla) from spodoptera frugiperda (sf9) cells using the baculovirus expression system. the recombinant cic was purified by affinit ...200919629661
experimental studies on the development of contracaecum rudolphii (nematoda: anisakidae) in copepod and fish paratenic hosts.the larval development of the nematode contracaecum rudolphii (rudolphi, 1819), a common parasite of the proventriculus of cormorants, was experimentally studied. within the eggs cultivated in freshwater under laboratory temperatures of 20-22 degrees c, the developing larva undergoes two moults on days 4-5, attaining the third larval stage. most of the ensheathed third-stage larvae, 291-457 microm long, hatch spontaneously from egg shells on days 5-6. experiments have indicated that hatched ensh ...200919827362
molecular and physiological study of the artificial maturation process in european eel males: from brain to testis.european eel males can be artificially matured (1.5iu hcg/g fish), but the regulatory mechanisms of their reproductive development are practically unknown. spermatogenic stages (s1-s6), biometric characters [eye index (ei), gonadosomatic index (gsi), hepatosomatic index (hsi)] and sperm quality parameters (motility, viability and head spermatozoa morphometry) were analysed. moreover, the present study evaluated the expression of gnrhs (mammal and chicken ii gonadotropin release hormone i) and go ...201019699741
ovarian gene transcription and effect of cadmium pre-exposure during artificial sexual maturation of the european eel (anguilla anguilla).european eels are dangerously threatened with extinction. recent advances tend to show that pollution could, in addition to other already identified factors, contribute to this drama. in a previous report, cadmium (cd) pre-exposure was found to strongly stimulate the pituitary-liver-gonad axis of maturing female silver eels, leading, lastly, to oocytes atresia and eels mortality. the present work was performed to get more insights into the effects of cd preexposure on eels' ovaries. the transcri ...200919484408
nitrite modulates contractility of teleost (anguilla anguilla and chionodraco hamatus, i.e. the antarctic hemoglobinless icefish) and frog (rana esculenta) hearts.being the largest form of intravascular and tissue storage of nitric oxide (no) and a signalling molecule itself, the nitrite anion (no(2)(-)) has emerged as a key player in many biological processes. since the heart is under an important no-mediated autocrine-paracrine control, in mammals the cardiac effects of nitrite are under intensive investigation. in contrast, nothing is known in non-mammalian vertebrates. we evaluated nitrite influence on cardiac performance in the perfused beating heart ...200919298789
genetic variability is unrelated to growth and parasite infestation in natural populations of the european eel (anguilla anguilla).positive correlations between individual genetic heterozygosity and fitness-related traits (hfcs) have been observed in organisms as diverse as plants, marine bivalves, fish or mammals. hfcs are not universal and the strength and stability of hfcs seem to be variable across species, populations and ages. we analysed the relationship between individual genetic variability and two different estimators of fitness in natural samples of european eel, growth rate (using back-calculated length-at-age 1 ...200919840264
monitoring of herpesvirus anguillae (hva) infections in european eel, anguilla anguilla (l.), in northern germany. 200919460086
simultaneous use of strontium:calcium and barium:calcium ratios in otoliths as markers of habitat: application to the european eel (anguilla anguilla) in the adour basin, south west france.sr:ca and ba:ca ratios in water from the adour estuary show a clear relationship with the salinity of the surrounding water for salinities <20, while ratios are almost constant above this level of salinity. a positive relationship was observed for the sr:ca ratio, whereas it was inverse for the ba:ca ratio. these two elemental ratios were measured in the otoliths of the european eels (anguilla anguilla l.) using femtosecond laser ablation linked to an icp-ms (fs-la-icp-ms). there was a direct re ...201020338633
thyroid hormone-induced demineralisation of the vertebral skeleton of the eel, anguilla anguilla.the role of thyroid hormones (th) in bone remodelling is controversial. indeed, in humans, while they are necessary for normal growth and development, their overproduction can induce important mineral bone loss and osteoporosis. intense bone resorption is a natural phenomenon also observed in some teleosts, during reproductive migration and fasting. our work aimed at investigating the effects of chronic treatments with th (thyroxin, t4 or triiodothyronine, t3) on bone resorption in a migratory f ...200717280664
changes in gene expression in european eels (anguilla anguilla) induced by infection with swim bladder nematodes (anguillicola crassus).the european eel, anguilla anguilla, is considered an endangered species that is under pressure for many reasons. among others, the introduced parasite anguillicola crassus is thought to play an important role in the decline of eel populations. these nematodes have been shown to negatively affect many fitness-related traits in eels, e.g., growth, osmoregulation, and stress tolerance. nevertheless, there has been little work on the way in which the host-parasite interaction influences the molecul ...200920049987
yellow eel (anguilla anguilla) development in nw portuguese estuaries with different contamination levels.the aims of the present study were to compare the health status of yellow eels (anguilla anguilla) developing in three estuaries of the nw portuguese coast with different levels of pollution and their physiological responses to combined effects of environmental variation and pollution. for this, a field study was performed using a multi-parameter approach, including eels condition indexes and biomarkers, water quality variables and other environmental factors. sixteen biological parameters were ...200919123036
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