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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
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
brominated flame retardants and polychlorinated biphenyls in fish from the river scheldt, belgium.levels of polybrominated diphenyl ethers (pbdes), hexabromocyclododecanes (hbcds), and polychlorinated biphenyls (pcbs) were measured in several fish species originating from the river scheldt (belgium). five sampling locations were chosen in a highly industrialized area along the river, while two ponds in the vicinity of the river served as reference sites. the present study is a follow-up of a survey performed in 2000 which reported extremely high levels of pbdes and hbcds in eel (anguilla ang ...200818400299
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
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
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
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
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
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
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
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
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
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
biomonitoring of polybrominated diphenyl ether (pbde) pollution: a field study.polybrominated diphenyl ethers (pbdes) and cytochrome p450 enzyme activities were investigated in european eels (anguilla anguilla) collected from seven sites in a coastal lagoon in the north-western mediterranean sea, orbetello lagoon (italy). twelve pbde congeners were measured in muscle and two cyp1a enzyme activities, 7-ethoxyresorufin-o-deethylase (erod) and benzo(a)pyrene monooxygenase (bp(a)pmo), were investigated in liver microsomal fraction in order to obtain insights into the health of ...200818485829
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
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
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
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
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
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
the effect of thawing methods on the quality of eels (anguilla anguilla).physical (colour), chemical (ph, total volatile basic nitrogen (tvb-n), thiobarbituric acid values (tba)) and microbiological (total aerobic mesophylic bacteria, salmonella, coliform, yeast and mould counts) analyses were carried out on thawed european eel (anguilla anguilla). different thawing treatments were used (in a refrigerator, in water, in air at ambient temperature and in a microwave oven). the results obtained were compared statistically with those of fresh fish. ph, tba and a(∗) value ...200826047438
brush-border amino acid transport mechanisms in carnivorous eel intestine.brush-border membrane vesicles (bbmv) were prepared from european eel (anguilla anguilla) intestinal epithelium by a magnesium-ethylene glycolbis(beta-aminoethyl ether)-n,n,n',n'-tetraacetic acid (egta) precipitation technique. amino acid transport by these purified vesicle preparations was investigated using either radiolabeled substrates or the voltage-sensitive fluorescent dye 3,3'-diethylthiadicarbocyanine iodide [disc2(5)]. all amino acids tested exhibited carrier-mediated, na+-dependent an ...20092782453
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
effects of the swimbladder parasite anguillicola crassus on the migration of european silver eels anguilla anguilla in the baltic sea.in a mark-recapture study in 2006, migrating european anguilla anguilla silver eels were caught, tagged and released in the baltic sea and recaptures in commercial pound nets examined for possible effects on migration of infection with the swimbladder parasite anguillicola crassus. the overall recapture rate was 36%. the prevalence of infection was lowest at the northernmost sampling site. there were no significant differences between infected and uninfected a. anguilla in condition indices, bod ...200920735694
f-type lectin from the sea bass (dicentrarchus labrax): purification, cdna cloning, tissue expression and localization, and opsonic activity.recently described biochemical and structural aspects of fucose-binding lectins from the european eel (anguilla anguilla) and striped bass (morone saxatilis) led to the identification of a novel lectin family ("f-type" lectins) characterized by a unique sequence motif and a characteristic structural fold. the f-type fold is shared not only with other members of this lectin family, but also with apparently unrelated proteins ranging from prokaryotes to vertebrates. here we describe the purificati ...200919162197
improvement of european eel sperm cryopreservation method by preventing spermatozoa movement activation caused by cryoprotectants.sperm production has been obtained from european and japanese eels, but its quality and quantity tend to be changeable. so, its cryopreservation has been tried in both species. dimethyl sulfoxide (me(2)so) is the best cryoprotectant for european eel sperm, but increases the medium osmolality, inducing the activation of spermatozoa motility. to avoid this, different combinations of ph (6.5 and 8.5) and nahco(3) concentrations (20, 40 and 80mm) were tested with two me(2)so concentrations (5% and 1 ...200919508865
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
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
massive encapsulation of larval anguillicoloides crassus in the intestinal wall of japanese eels.abstract:200919832983
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
anthropogenic impacts on the orbetello lagoon ecosystem.the aim of the present study was to assess the environmental quality of orbetello lagoon (tyrrhenian coast, italy), using a biomonitoring method based on measuring organochlorinated pollutants in the anguilla anguilla, chosen as sentinel organism, and remote sensing data obtained by elaboration of landsat 7 enhanced thematic mapper (etm) data of 2002. polychlorinated biphenyls and organochlorine pesticides were determined by gas chromatography/mass spectrometry in muscle of european eels capture ...200919651809
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
monitoring of herpesvirus anguillae (hva) infections in european eel, anguilla anguilla (l.), in northern germany. 200919460086
[non-indigenous and non-specific parasitic nematodes--the background and the consequences].introduction of the host is the main reason behind introduction of the parasite, e. g., nematodes. the introduction of the japanese eel (anguilla japonica) in europe in the 1980s resulted in expansion of the swimbladder nematode anguillicola crassus which soon invaded not only populations of the european eel (a. anguilla), but also other local fish. the raccoon (procyon lotor) is native to north america. it is the specific host of strongyloides procyonis and baylisascaris procyonis. more than 90 ...200920209803
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
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
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
temporal analysis of electroretinographic responses in fishes with rod-dominated and mixed rod-cone retina.photoreceptor content of fish retinas could be accessed by comparative electroretinographic (erg) studies using flickering light stimuli that could separate rod-mediated vision where critical flicker frequency (cff, frequency when the eye loses its ability to resolve individual light pulses) is usually less than 15 hz from cone-mediated vision. four fish species inhabiting different photic environments (small-spotted dogfish shark--scyliorhinus canicula, eel--anguilla anguilla, painted comber--s ...200920037193
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
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
ammonia sensitivity of the glass eel (anguilla anguilla l.): salinity dependence and the role of branchial sodium/potassium adenosine triphosphatase.eel aquaculture is capture based and thus dependent on the fishery for juvenile glass eels. this fishery typically takes place in estuaries where salinity varies and ammonia levels can be elevated. also, during capture and transport glass eels are kept at high densities and ammonia from endogenous production can increase to toxic levels. ammonia is known to have detrimental effects on fish growth and survival. in the present study, the salinity dependence of ammonia sensitivity in glass eels acc ...200918717620
development of real-time rt-pcr assays for eel gonadotropins and their application to the comparison of in vivo and in vitro effects of sex steroids.gonadotropins, luteinizing hormone (lh) and follicle-stimulating hormone (fsh), are key factors in the brain-pituitary-gonad axis and understanding their regulation remains essential for future management of eel reproduction. in this regard, we developed quantitative real-time rt-pcr (qrtrt-pcr) assays for the expression of european eel lhbeta, fshbeta and gpalpha subunits, using the light cycler system. the qrtrt-pcr was adapted to permit detection of the three gonadotropin subunit mrnas in ind ...200917418843
oceanic spawning migration of the european eel (anguilla anguilla).european eels (anguilla anguilla) undertake a approximately 5000-kilometer (km) spawning migration from europe to the sargasso sea. the larvae are transported back to european waters by the gulf stream and north atlantic drift. however, details of the spawning migration remain unknown because tracking eels in the atlantic ocean has, so far, eluded study. recent advances in satellite tracking enable investigation of migratory behavior of large ocean-dwelling animals. however, sizes of available t ...200919779192
developmental dynamics of cone photoreceptors in the eel.many fish alter their expressed visual pigments during development. the number of retinal opsins expressed and their type is normally related to the environment in which they live. eels are known to change the expression of their rod opsins as they mature, but might they also change the expression of their cone opsins?200920025774
phospholamban s-nitrosylation modulates starling response in fish heart.the frank-starling mechanism is a fundamental property of the vertebrate heart, which allows the myocardium to respond to increased filling pressure with a more vigorous contraction of its lengthened fibres. in mammals, myocardial stretch increases cardiac nitric oxide (no) release from both vascular endothelium and cardiomyocytes. this facilitates myocardial relaxation and ventricular diastolic distensibility, thus influencing the frank-starling mechanism. in the in vitro working heart of the e ...200919726482
guanylin-like peptides, guanylate cyclase and osmoregulation in the european eel (anguilla anguilla).three guanylin-like peptides, guanylin, uroguanylin and renoguanylin and two guanylate cyclase type c (gc-c) receptor isoforms were cloned and sequenced from the european eel (anguilla anguilla). all peptides and both receptors (gc-c1 and gc-c2) were predominantly expressed within the intestine and kidney of both sexually immature yellow, and sexually maturing, migratory silver eels. the derived amino acid sequences for the pre-prohormones and guanylate cyclase isoforms had structural features i ...200919028495
two distinct dopamine d2 receptor genes in the european eel: molecular characterization, tissue-specific transcription, and regulation by sex steroids.two full-length cdna encoding putative dopamine d2-like receptors were cloned from the brain of female european eel. the deduced protein sequences, termed d2a- and d2b-r, exhibit closer phylogenetic relationships to vertebrate d2 receptors compared with d3 and d4 or d1 receptors. the two protein sequences share 100% identity within the transmembrane domains containing the highly conserved amino acids involved in dopamine binding. accordingly, an apparent single population of sites on eel brain m ...200918974275
molecular cloning and characterization analysis of immunoglobulin m heavy chain gene in european eel (anguilla anguilla).in this study, the immunoglobulin m heavy chain gene of european eel (anguilla anguilla) was cloned and analyzed. the full-length cdna of the igm heavy chain gene (genbank accession no. ef062515) has 2089 nucleotides encoding a putative protein of 581 amino acids. the igm heavy chain was composed of leader peptide (l), variable domain (vh), ch1, ch2, hinge, ch3, ch4, and c-terminus and two novel continuous putative n-glycosylation sites were found close to the second cysteine of ch3 in a. anguil ...200919013650
effects of propanil on the european eel anguilla anguilla and post-exposure recovery using selected biomarkers as effect criteria.the aim of this study was to assess the physiological response of anguilla anguilla to propanil and the degree of recovery after being moved to clean water. preliminary acute toxicity test was carried out in the laboratory and the median lethal concentration (lc50) at 96 h was calculated as 31.33 mg/l (29.60-33.59 mg/l). noec and loec values (at 96 h) were also calculated as 20 and 25mg/l, respectively. the fish were exposed to 0.63 and 3.16 mg/l of propanil for 72 h and allowed to recover for 1 ...200918973941
do otolith annular structures correspond to the first freshwater entry for yellow european eels anguilla anguilla in the baltic countries?to examine the relationship between freshwater entry and otolith annular structures, a total of 113 naturally recruited european eels anguilla anguilla from lithuania and latvia that entered fresh water at least once were collected. in some individuals (8.3-11.3%), the first freshwater entry coincided with a dark check that was distinctly different from neighbouring annuli. in most individuals (81.7-84.9%), the first freshwater entry occurred on rings and increments indistinguishable from other ...200920738518
route choices, migration speeds and daily migration activity of european silver eels anguilla anguilla in the river rhine, north-west europe.downstream migration of anguilla anguilla silver eels was studied in the lower rhine, germany, and the rhine delta, the netherlands, in 2004-2006. fish (n = 457) released near cologne with implanted transponders were tracked by remote telemetry at 12 fixed detection locations distributed along the different possible migration routes to the north sea. relatively more a. anguilla migrated via the waal than the nederrijn, as would be expected from the ratio of river discharges at the bifurcation po ...200920735693
effects of commercial fishing and predation by cormorants on the anguilla anguilla stock of a shallow eutrophic lake.mortality of eels anguilla anguilla in a large shallow lake in france due to predation by the cormorant phalacrocorax carbo was found to be moderate when compared to fishery catches over a 9 year period. the results show that, contrary to previous extrapolations made at the pan-european scale, p. carbo predation in shallow lakes is not invariably a major contributor to a. anguilla mortality, even in the presence of large colonies.200920735692
transcript profiling and dna damage in the european eel (anguilla anguilla l.) exposed to 7,12-dimethylbenz[a]anthracene.the molecular responses induced during and after an acute exposure to 7,12-dimethylbenz[a]anthracene (dmba) were analysed in liver, gill and blood cells of juvenile anguilla anguilla with the aim of developing molecular biomarkers of environmental pah pollution. changes in the mrna expression levels of the cell cycle checkpoint-related rad1 gene and the mrnas of differentially expressed genes by suppression subtractive hybridization (ssh) were analysed in the liver, and related to well-establish ...200919586669
brain derived neurotrophic factor and trk b mrna expression in the brain of a brain stem-spinal cord regenerating model, the european eel, after spinal cord injury.evidence from mammalian studies suggests that brain derived neurotrophic factor (bdnf) and its receptor, trk b, are upregulated in neuronal cell bodies after injury. although fish possess neurotrophins and display rapid functional and morphological recovery after central nervous system (cns) injury, to date few studies have examined neurotrophin expression during cns regeneration. in this study, rt-pcr was used to investigate the effect of complete spinal cord transection on the mrna expression ...200919545610
piscivory and trophic position of anguilla anguilla in two lakes: importance of macrozoobenthos density.the feeding habits of the european eel anguilla anguilla (>300 mm total length, l(t)) were compared in two lakes of different environmental state: lake grosser vätersee (lgv), germany (clear water, mesotrophic and submerged macrophytes), and lake vallum (lv), denmark (turbid, eutrophic and no submerged macrophytes). the density of macrozoobenthos was higher in lv (3500 individuals m(-2)) than in lgv (1500 individuals m(-2)). the abundance of small prey fishes (40-99 mm l(t)) was highest in lv. i ...200920735691
salinity-linked growth in anguillid eels and the paradox of temperate-zone catadromy.temperate-zone anguillid eels use both saline (marine or brackish) and fresh waters during their continental phase, but use of fresh waters is paradoxical because on average these fishes grow more rapidly in saline than in fresh waters. based on data from anguillid eels whose habitat-residency histories had been determined by sr:ca otolithometry, superiority of growth rates in saline water is much greater in american eels anguilla rostrata in north-eastern north america (mean saline:fresh growth ...200920735690
size selectivity of fyke nets for european eel anguilla anguilla.size selectivity of fyke nets for european eels anguilla anguilla was investigated by reviewing the results of published experimental studies. a general size selectivity model was then derived that can be easily incorporated into demographic models to simulate population dynamics, assess and monitor abundance and length structure of eel stocks and forecast the consequences of different management options.200920735696
morphological and genetic seasonal dynamics of european eel anguilla anguilla recruitment in southern france.the fine scale morphological and genetic dynamics of successive waves of anguilla anguilla glass eel recruitment was studied over a 2 year period at a southern european mediterranean location (camargue, france) with continuous recruitment. using morphometric [total length (l(t)), mass (m), condition (k) and pigmentation stage] as well as genetic (allozyme) markers, the aim was to test for the existence of temporally separated spawning groups and explore the relation between genetic variability a ...200920735688
estimates of the mortality and the duration of the trans-atlantic migration of european eel anguilla anguilla leptocephali using a particle tracking model.using lagrangian simulations, based on circulation models over three different hydroclimatic periods in the last 45 years in the north atlantic ocean, the trans-atlantic migration of the european eel anguilla anguilla leptocephali was simulated via the passive drift of particles released in the spawning area. three different behaviours were modelled: drifting at fixed depth, undergoing a vertical migration or choosing the fastest currents. simulations included mortality hypotheses to estimate a ...200920735679
regulation of expression of the myo-inositol monophosphatase 1 gene in osmoregulatory tissues of the european eel anguilla anguilla after seawater acclimation.previous microarray studies in our laboratory identified a number of genes that were differentially expressed in "silver" eels after transfer from freshwater (fw) to seawater (sw). a group of genes, which are related to the synthesis, processing, and transport of certain known osmolytes in mammalian cells, have been identified. one gene implicated with osmolyte production is myo-inositol monophosphatase (impa1). the aim of this study was to compare the expression of impa1 in the major osmoregula ...200919456379
panmixia in european eel revisited: no genetic difference between maturing adults from southern and northern europe.previous studies of genetic structure in the european eel have resulted in seemingly conflicting results, ranging from no detectable heterogeneity to small but statistically significant differences and isolation by distance patterns among eels sampled across the continental range. differences with respect to sampling design and choice of molecular markers, combined with a lack of power estimates, complicate comparisons of existing results. in this study we have used six microsatellite markers an ...200919417764
magnetic particles associated with the lateral line of the european eel anguilla anguilla.magnetization measurements of the european eel anguilla anguilla demonstrated the presence of magnetic material concentrated in the region of the mandibular canals of the lateral line system. the data suggest that the material is magnetite, has a size suitable for magnetoreception and is of biogenic origin. the presence of magnetic particles in the lateral line system is discussed in relation to their possible role in allowing the fish to orientate with respect to the geomagnetic field during th ...200920735659
genetic composition of atlantic and mediterranean recruits of european eel anguilla anguilla based on est-linked microsatellite loci.anguilla anguilla glass eels arriving at two mediterranean and two atlantic sites were tested for differences in genetic composition between regions using a total of 23 microsatellite loci developed from an expressed sequence tag (est) library. hierarchical analysis of molecular variance indicated a non-significant difference between regions (mediterranean v. atlantic), which contrasted with the significant differences observed between samples within regions. the existence of a single spawning s ...200920735687
swimming activity and behaviour of european anguilla anguilla glass eels in response to photoperiod and flow reversal and the role of energy status.to better understand migratory divergences among anguilla anguilla glass eels, the behaviour of individuals caught at the time of their estuary entrance was studied through their response to a light:dark cycle and then to both water current reversal and light:dark cycle. in a first experiment, fish moving with the flow in response to dusk (m(+) fish) and fish that had not exhibited any movement (m(-) fish) were distinguished. anguilla anguilla from these two groups were then individually marked ...200920735685
environmental determinism of year-to-year recruitment variability of european eel anguilla anguilla in a small coastal catchment, the frémur river, north-west france.the influence of environmental factors (mainly the river flow) on the year-to-year variability of european eel anguilla anguilla fluvial recruitment in a small coastal catchment, the frémur river (north-west france) was examined. a comprehensive survey of catches from fixed traps at two weirs located at 4.5 km (pont es omnes dam) and 6.0 km (bois joli dam) above the river mouth was carried out between 1997 and 2004. young pigmented elvers (mean +/-s.d. total length, 133.7 +/- 29.6 mm) were recru ...200920735684
pcbs and the energy cost of migration in the european eel (anguilla anguilla l.).the effect of polychlorinated biphenyls (pcbs) on the energy consumption of fasting silver european eel (anguilla anguilla l.) was studied over a 27-day period during which the animals were at rest or were swimming 800 km in blazka swim tunnels. three-year-old female hatchery eels (silver stage) between 73 and 80 cm long weighing around 1 kg were dosed intraperitoneally with pcbs at a nominal dosage of 10x the consumption standard as a mixture representative for planar (7 microg pcb126/kg eel), ...200919371957
depth distribution and biological characteristics of the european eel anguilla anguilla in lough ennell, ireland.using a longline survey, a total of 196 european eels anguilla anguilla were collected at different depths in lough ennell (maximum depth 30 m), central ireland. the catch per unit of effort of a. anguilla that were caught from 1 to 25 m depths was lowest at 0.5-5.0 m and greatest at the deepest depth range (22.5-25.0 m). sub-samples of a. anguilla from depths of <15 m showed little or no difference in size, sex ratio, age, growth rate, condition factor, length-mass relationship, gonado-somatic ...200920735604
cortisol mobilizes mineral stores from vertebral skeleton in the european eel: an ancestral origin for glucocorticoid-induced osteoporosis?endogenous excess cortisol and glucocorticoid (gc) therapy are a major cause of secondary osteoporosis in humans. intense bone resorption can also be observed in other vertebrates such as migratory teleost fish at the time of reproductive migration and during fasting when large amounts of calcium and phosphate are required. using a primitive teleost, the european eel, as a model, we investigated whether cortisol could play an ancestral role in the induction of vertebral skeleton demineralization ...200919223398
isolation and characterization of expressed sequence tag-linked microsatellite loci for the european eel (anguilla anguilla).a european eel (anguilla anguilla) expressed sequence tag database consisting of 795 contigs and 4008 singletons was screened for microsatellites sequences. primers were designed to amplify 96 repeats, of which 86 gave good quality amplification products. twenty-eight microsatellites were selected for further microsatellite genotyping. only two loci were found to be monomorphic; out of the 26 polymorphic loci, number of alleles per locus ranged from two to 14, while the observed and expected het ...200921564612
growth and mortality of european glass eel anguilla anguilla marked with oxytetracycline and alizarin red.the growth and mortality of european glass eel anguilla anguilla 192 days after marking with oxytetracycline and alizarin red s were not significantly different between the two treatments and not different to the unmarked a. anguilla.200920735541
physiological responses to starvation in the european eel (anguilla anguilla): effects on haematological, biochemical, non-specific immune parameters and skin structures.the physiological effects of short-term starvation on some haematological, biochemical and non-specific immune response parameters together with the histological structure of the skin, were investigated in the european eel, anguilla anguilla. blood haemoglobin and haematocrit, serum glucose and cortisol, hemolysins, haemagglutinins, and lysozyme in the plasma, kidney and epidermal extract, were measured in fish after 31, 42 and 58 days of starvation, and compared to those of fed fish. starvation ...201019093221
cephalic morphology of pythonichthys macrurus (heterenchelyidae: anguilliformes): specializations for head-first burrowing.the heterenchelyidae, a family of anguilliformes, are highly specialized fossorial eels. this study was conducted to evaluate the cranial specialization in relation to head-first burrowing behavior in the heterenchelyid, pythonichthys macrurus. thereby, detailed descriptions are provided of the cranial myology and osteology of p. macrurus and its differences with that of representatives of three families: the moringuidae (moringua edwardsi), a head-first burrower; the anguillidae (anguilla angui ...201020730919
european eel (anguilla anguilla) genotoxic and pro-oxidant responses following short-term exposure to roundup--a glyphosate-based herbicide.the glyphosate-based herbicide, roundup, is among the most used pesticides worldwide. due to its extensive use, it has been widely detected in aquatic ecosystems representing a potential threat to non-target organisms, including fish. despite the negative impact of this commercial formulation in fish, as described in literature, the scarcity of studies assessing its genotoxicity and underlying mechanisms is evident. therefore, as a novel approach, this study evaluated the genotoxic potential of ...201020643706
oceanic fronts in the sargasso sea control the early life and drift of atlantic eels.anguillid freshwater eels show remarkable life histories. in the atlantic, the european eel (anguilla anguilla) and american eel (anguilla rostrata) undertake extensive migrations to spawn in the oceanic sargasso sea, and subsequently the offspring drift to foraging areas in europe and north america, first as leaf-like leptocephali larvae that later metamorphose into glass eels. since recruitment of european and american glass eels has declined drastically during past decades, there is a strong ...201020573625
qualitative assessment of the diet of european eel larvae in the sargasso sea resolved by dna barcoding.european eels (anguilla anguilla) undertake spawning migrations of more than 5000 km from continental europe and north africa to frontal zones in the sargasso sea. subsequently, the larval offspring are advected by large-scale eastward ocean currents towards continental waters. however, the sargasso sea is oligotrophic, with generally low plankton biomass, and the feeding biology of eel larvae has so far remained a mystery, hampering understanding of this peculiar life history. dna barcoding of ...201020573615
a role for inositol monophosphatase 1 (impa1) in salinity adaptation in the euryhaline eel (anguilla anguilla).this study investigated the expression and tissue distribution of inositol monophosphatase (impa1) and characterized its role in salinity adaptation in the eel. the coding sequence of eel impa1 was determined and confirmed to be orthologous to the mammalian gene/enzyme by phylogenetic analysis and structural modeling. quantitative real-time pcr and western blot techniques indicated up to 17-fold increases in mrna expression and 2-fold increases in protein abundance in major osmoregulatory tissue ...201020547660
persistent organic pollutants (pcb, ddt, hch, hcb & bde) in eels (anguilla anguilla) in scotland: current levels and temporal trends.eels are an ideal biomonitor for persistent organic pollutants (pops) because of their high lipid content, longevity and tendency to remain within a defined range during their freshwater life phase. this study investigated concentrations of pops in eels (anguilla anguilla) from 30 sites across scotland, including polychlorinated biphenyls (pcbs), polybrominated diphenyl ethers (bdes), ddt (and metabolites), hexachlorocyclohexanes (alpha, beta, gamma-hch), hexachlorobenzene (hcb), hexachlorobutad ...201020471146
distribution of perfluorinated compounds in aquatic systems in the netherlands.the distribution of 15 perfluorinated compounds (pfcs) among eel (anguilla anguilla), sediment, and water was investigated for 21 locations in the netherlands. furthermore, for perfluorooctanesulfonate (pfos), a 30 year time series was measured for three locations using historical eel samples. these historical samples revealed concentrations increasing by a factor of 2-4 until the mid-1990s, followed by a return to the initial levels. in the samples described here, pfos dominated aqueous concent ...201020426438
determination of polybrominated diphenyl ethers in fish tissues by matrix solid-phase dispersion and gas chromatography coupled to triple quadrupole mass spectrometry: case study on european eel (anguilla anguilla) from mediterranean coastal lagoons.this paper describes the development and validation of an analytical methodology to determine 28 polybrominated diphenyl ethers (pbdes) in european eel (anguilla anguilla) tissues using matrix solid-phase dispersion (mspd) and gas chromatography coupled to triple quadrupole mass spectrometry (gc-qqq-ms/ms). a total of 28 pbdes were targeted, including tri- to deca-brominated congeners. the robustness and effectiveness of the proposed sample preparation procedure was demonstrated in lipid-rich ee ...201020800720
[cdna cloning and tissue-differential expression of na+/k+/2cl(-)-cotransporter 1-alpha isoform in sarotherodon melanotheron].the gills are the major apparatus for osmoregulation in fish to acclimate the changes of salinities. na+/k+/2cl(-)cotransporter 1-alpha (nkcc1 alpha) is one of the key ion cotransporter locoalized in gill chloride cells which has been associated with the maintence of osmotic homeostasis. the transport process mediated by nkcc1 alpha is characterized by electroneutrality with a stoichiometry of 1na:1k:2cl. sarotherodon melanotheron is one of the most euryhaline teleosts able to withstand variatio ...201021174349
topography and ultrastructure of the tegument of bucephalus anguillae (digenea: bucephalidae), a parasite of the european eel anguilla anguilla (osteichthyen: anguillidae).the tegumental ultrastructure of the intestinal fluke bucephalus anguillae was studied with the use of scanning and transmission electron microscopy. the surface of the tegument is covered by transverse ridges from which protrude numerous closely packed, digitated, and claw-shaped spines. cobblestone-like units of the tegument were observed on the crescent-shaped formation of the rhynchus and at the posterior part of the body. three types of sensory structures were examined, i.e., 2 uniciliated ...201021158617
sex-related differences in aerobic capacities and reactive oxygen species metabolism in the silver eel.silver european eels (anguilla anguilla l.) need to develop important aerobic capacities to cope with their long fasting spawning migration at depth, particularly males which are about half the size of females. moreover, they have to face potential oxidative stress because reactive oxygen species (ros) production is linked to the increase in metabolic rate. thus, aerobic metabolism was globally evaluated in male and female silver eels exposed to a 10.1 mpa hydrostatic pressure (1,000 m depth). o ...201019680762
reflex bradycardia does not influence oxygen consumption during hypoxia in the european eel (anguilla anguilla).most teleost fish reduce heart rate when exposed to acute hypoxia. this hypoxic bradycardia has been characterised for many fish species, but it remains uncertain whether this reflex contributes to the maintenance of oxygen uptake in hypoxia. here we describe the effects of inhibiting the bradycardia on oxygen consumption (mo(2)), standard metabolic rate (smr) and the critical oxygen partial pressure for regulation of smr in hypoxia (pcrit) in european eels anguilla anguilla (mean +/- sem mass 5 ...201020012057
the effects of contaminants in european eel: a review.european eel (anguilla anguilla (l.)) stocks are in decline in most of their geographical distribution and their status is considered below safe biological limits. recently, there is an increasing awareness that spawner quality might be an essential element in the decline of the species since pollution by bioaccumulating chemical substances may have a large impact on the reproduction success of the eel. this review gives an overview of the literature on the effects of contaminants on the europea ...201019806452
swimming physiology of european silver eels (anguilla anguilla l.): energetic costs and effects on sexual maturation and reproduction.the european eel migrates 5,000-6,000 km to the sargasso sea to reproduce. because they venture into the ocean in a pre-pubertal state and reproduce after swimming for months, a strong interaction between swimming and sexual maturation is expected. many swimming trials have been performed in 22 swim tunnels to elucidate their performance and the impact on maturation. european eels are able to swim long distances at a cost of 10-12 mg fat/km which is 4-6 times more efficient than salmonids. the t ...201020390348
swimming suppresses hepatic vitellogenesis in european female silver eels as shown by expression of the estrogen receptor 1, vitellogenin1 and vitellogenin2 in the liver.when european silver eels (anguilla anguilla) venture into the atlantic ocean for their 6,000 km semelparous spawning run to the sargasso sea, they are still in a prepubertal stage. further sexual development appears to be blocked by dopaminergic inhibition of hypothalamus and pituitary activity. recently, we found that swimming for several weeks in freshwater stimulated the incorporation of fat droplets in the oocytes. so, it was hypothesized that long term swimming in seawater would release th ...201020302623
temporal expression of hepatic estrogen receptor 1, vitellogenin1 and vitellogenin2 in european silver eels.because european silver eels have never been caught during or after their 6000-km reproductive migration to the sargasso sea, all existing knowledge on their sexual maturation comes from hormonal stimulation. silver eels that start their oceanic migration are still immature with pre-vitellogenic oocytes. hence we assumed that vitellogenesis should start with the expression of the estrogen receptor in the liver before the circulating 17beta-estradiol (e2) can have any effect. in this study we fol ...201019766647
arsenic speciation in freshwater fish: focus on extraction and mass balance.arsenic (as) speciation in muscle tissues of freshwater fish was investigated with special emphasis on extraction yields and mass balances. for the quantification of water-soluble as compounds, samples were extracted using a 1:1 (v/v) methanol/water mixture. various extraction parameters, such as extraction volume, number of additional extractions, intermediate and final volume in sample preconcentration were optimized so as to improve the extraction efficiency. arsenic compounds were determined ...201020188911
thirty year monitoring of pcbs, organochlorine pesticides and tetrabromodiphenylether in eel from the netherlands.because of their excellent properties as a biomonitor, yellow eels (anguilla anguilla) have been used for time-trend monitoring of polychlorinated biphenyls (pcbs), organochlorine pesticides (ocps) and tetrabrominated diphenylether (tetra-bde). the program has now lasted for thirty years and has delivered valuable information on trends and spatial differences of these compounds in the delta of the rivers rhine and meuse and other dutch canals, rivers and lakes. specific local pcb, hch and dieldr ...201020185213
the occurrence of persistent chlorinated and brominated organic contaminants in the european eel (anguilla anguilla) in irish waters.the european eel (anguilla anguilla) is a relatively high lipid, long lived species capable of living in a variety of brackish, fresh and marine habitats. as such, eels can accumulate organic pollutants and have been incorporated into environmental monitoring programs as a suitable "bioindicator" species for the determination of the levels of organic contaminants within different water bodies. the global eel stock is now in decline and while the cause of the collapse remains unidentified, it is ...201020153504
identification of anguilla anguilla (l.) and anguilla rostrata (le sueur) and their hybrids based on a diagnostic single nucleotide polymorphism in nuclear 18s rdna.the variability of the nuclear 18s rdna was examined for 10 species of freshwater eels: anguilla anguilla, a. australis, a. dieffenbachii, a. japonica, a. marmorata, a. mossambica, a. nebulosa labiata, a. obscura, a. reinhardtii and a. rostrata. we observed that a single nucleotide polymorphism (snp) separated a. anguilla and a. japonica from the remaining taxa. while this snp marker may be used to identify hypothetical hybrids of a. japonica and sympatric eel species, we focused on atlantic eel ...201021565005
olfactory sensitivity to bile fluid and bile salts in the european eel (anguilla anguilla), goldfish (carassius auratus) and mozambique tilapia (oreochromis mossambicus) suggests a 'broad range' sensitivity not confined to those produced by conspecifics alone.teleosts have high olfactory sensitivity to bile salts. to assess whether this phenomenon is involved in intra-specific chemical communication alone, or is part of a more ;broad range' sensitivity to bile salts produced by heterospecifics, we investigated possible differences in the odour of bile between the sexes and among different species - the eel (anguilla anguilla), goldfish (carassius auratus) and mozambique tilapia (oreochromis mossambicus) - using the electro-olfactogram (eog). we also ...201020038666
sequencing, de novo annotation and analysis of the first anguilla anguilla transcriptome: eeelbase opens new perspectives for the study of the critically endangered european eel.once highly abundant, the european eel (anguilla anguilla l.; anguillidae; teleostei) is considered to be critically endangered and on the verge of extinction, as the stock has declined by 90-99% since the 1980s. yet, the species is poorly characterized at molecular level with little sequence information available in public databases.201021080939
chemical contaminants in fish species from rivers in the north of luxembourg: potential impact on the eurasian otter (lutra lutra).contamination levels of pcbs, and of the heavy metals cadmium (cd), lead (pb) and mercury (hg) were analyzed in four fish species from seven rivers in the north of luxembourg. during august and september 2007, 85 samples of fish were collected belonging to four species: the stone loach (barbatula barbatula, n=12 pools), the chub (squalius cephalus, n=36), the barbel (barbus barbus, n=23) and eel (anguilla anguilla, n=14). the concentration of seven indicator pcbs ( summation operator(7)pcbs) rea ...201020060148
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
natural, social, economical and political influences on fisheries: a review of the transitional area of the polish waters of the vistula lagoon.a 60 year (1948-2007) dataset gathered by polish researchers working on the vistula lagoon fish assemblages and fisheries has shown this stressed transitional environment to be always been dominated by a few highly abundant fish species. during this period, the surrounding countries poland and russia (kaliningrad) were transformed from centrally-planned economies with fixed prices to free market systems. the organization of the fishery evolved from one in which the majority of the fishing effort ...201020359718
epidemiology and pathology of anguillicoloides crassus in european eel anguilla anguilla from the tagus estuary (portugal).infection of the european eel anguilla anguilla by the swimbladder nematode anguillicoloides crassus was investigated for the first time at 5 sampling sites in the tagus estuary (portugal). a total of 332 yellow eels were examined, revealing a prevalence of 56% and a mean intensity of 3.2 lumen worms per swimbladder. the effect of the host's sex and size on parasitism descriptors was studied. only total length (tl) was considered a significant determinant, with larger eels harbouring a higher nu ...201020377012
organochlorine pollutants in european eel (anguilla anguilla l.) from poland.the purpose of the current paper is to report the levels of oc pesticides ([summation operator]hchs, hcb, [summation operator]ddts), marker pcbs, pcdd/fs, and dl-pcbs in the muscle tissue of european eel, anguilla anguilla (l.), collected in the vistula and szczecin lagoons (poland), and in the local market. the results obtained were evaluated according to maximum limits adopted by eu, and some national legislatures. the intake of organochlorine contaminants from the consumption of eel from poli ...201020447675
identification of fucosylated glycoconjugates in xenopus laevis testis by lectin histochemistry.glycoconjugates play roles in many physiological and pathological processes. previous works have shown important functions mediated by glycans in spermatogenesis, and the carbohydrate composition of testis has been studied by several approaches, including lectin-histochemical methods. however, the testis of xenopus laevis, an animal model extensively employed in biochemical, cell and developmental research, has not yet been analysed. the aim of this work was to carry out a histochemical study of ...201020617442
genetic signatures in an invasive parasite of anguilla anguilla correlate with differential stock management.in this article, it is shown that available genetic tools for the omnipresent parasite anguillicoloides crassus in european eels anguilla anguilla are sensitive to different immigration rates into local a. anguilla stocks for two separated river systems. relying on four highly polymorphic microsatellite markers, it was inferred that under natural recruitment, nematode samples meet hardy-weinberg expectations for a single panmictic population, while genetic signals show signs for a strong wahlund ...201020646147
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