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[pleistophora ladogensis sp. n., a microsporidian (protozoa, microsporidia) from the musculature of the burbot, lota lota, and of the smelt, osmerus eperlanus eperlanus ladogensis].the parasite develops inside the fibres of the cross-striated musculature. on the histologic sections of the affected tissue most young stages of p. ladogensis are represented by 2--6 nucleic cells 5--6 mu in size. mature pansporoblasts have a thick and solid membrane. their average size is 43 (18--60) mu. the number of spores in pansporoblasts is over 16. live spores are egg-shaped and are 5.4 (5.0--5.8).2.9 (2.7--3.3) mu in size. the length of the polar filament is 100 to 180 mu.1978151848
eox and organochlorine compounds in fish and ringed seal samples from lake ladoga, russia.information about the pollution of lake ladoga, the largest lake in europe, has been controversial. various effluents and drainage waters affect the quality of the lake water. wastewaters have caused eutrophication of parts of lake ladoga, but concentrations of persistent organic pollutants in the lake's food webs are poorly understood. in this study, concentrations of some organochlorine compounds, chlorophenols (cps), and extractable organic halogen (eox) were determined in smelt (osmerus eper ...200011057612
[the role of fish parasites in fresh-water ecosystems exemplified by a parasite of the smelt (osmerus eperlanus)].the european smelt osmerus eperlanus had been accidentally introduced into the ecosystem of the syamozero lake (karelia). the population of this species has achieved a high density and caused serious changes in the structure and trophic relationships of fish community of the syamozero ecosystem. the microsporidia glugea hertwigi weisenberg, 1921 has become a new and super-dominant parasite of the european smelt in this ecosystem. the invasion of microsporidia has caused a mass death of fishes, t ...200010862398
sscp-based identification of members within the pseudoterranova decipiens complex (nematoda: ascaridoidea: anisakidae) using genetic markers in the internal transcribed spacers of ribosomal dna.the anisakid nematodes morphologically corresponding with pseudoterranova decipiens sensu lato (s.l.) (krabbe, 1878) from different seal or sea lion hosts and geographical origins, previously identified as pseudoterranova krabbei, p. decipiens (s.s.), p. bulbosa, p. azarasi and p. cattani by multilocus enzyme electrophoresis, were characterized using a dna approach. also a population of p. decipiens (s.l.) from chaenocephalus aceratus, the blackfin icefish, from antarctica and another from osmer ...200212118717
feeding ecology of pelagic fish species in the gulf of riga (baltic sea): the importance of changes in the zooplankton community.the feeding ecology of four pelagic fish species was studied in relation to their prey availability in the gulf of riga (baltic sea) during the summer 1999-2006. the zooplankton community was dominated by the cladoceran bosmina longispina, rotifers keratella cochlearis and k. quadrata and the copepod eurytemora affinis, with the highest interannual variability in abundance recorded for b. longispina. the last influenced the diet of adult sprat sprattus sprattus, juvenile smelt osmerus eperlanus ...201021155782
[a new type of pleurocercoids in the genus diphyllobothrium from smelts in the far east of the ussr].the research has demonstrated that 35.8% of hypomesus pretiosus girard and 55.9% of osmerus eperlanus dentex steindachner in various regions of the far east of the ussr (khabarovsk and primorye territories and sakhalin) are affected by diphyllobothriid larvae of a hitherto unknown type, indicated as the g type. parasites are localized on the internal organs of a intermediate host such as esophagus, stomach, liver and genital organs. diphyllobothriid larvae of the g type do not invade man, thus t ...19911923569
vitamins a1 and a2 in hepatic tissue and subcellular fractions in mink feeding on fish-based diets and exposed to aroclor 1242.two-month-old female mink were fed diets based on either baltic herring (clupea harengus membras) or freshwater smelt (osmerus eperlanus) for 21 weeks. a portion of the smelt-fed mink were exposed orally to polychlorinated biphenyls (pcbs), aroclor 1242 (1 mg/d). retinol (vitamin a1), 3,4-didehydroretinol (vitamin a2), and their different fatty acyl esters were studied in hepatic tissue, microsomes, and cytosol by argentated reversed-phase high-performance liquid chromatography. as a result of a ...200211833811
three rhamnose-binding lectins from osmerus eperlanus mordax (olive rainbow smelt) roe.three rhamnose-binding lectins were purified from the roe of osmerus eperlanus mordax (olive rainbow smelt) by affinity chromatography and ion-exchange chromatography. the apparent molecular weights of osmerus eperlanus mordax lectin (oml) -1, -2 and -3 were 25000, 32000 and 26000, respectively, on sodium dodecyl sulfate-polyacrylamide gel electrophoresis (sds-page) under reducing conditions. on native page, these three lectins showed different migration patterns (rm value; 0.37, 0.53 and 0.66, ...19938364467
parasitation with pseudoterranova decipiens (nematoda) influences the survival rate of the european smelt osmerus eperlanus retained by a screen wall of a nuclear power plant.a total of 354 adult european smelts osmerus eperlanus (l.) were tested for their ability to survive the screen system of the cooling water inflow of a power plant. with increasing number of musculature parasitic third-stage larvae of pseudoterranova decipiens, the survival rate of o. eperlanus decreased while the total number of externally visible injuries as well as the number of seriously injured specimens increased. the results indicate that even a single specimen of p. decipiens influences ...19989676248
occurrence of microsporidians glugea hertwigi and pleistophora ladogensis, in smelt osmerus eperlanus from two german rivers, north sea coast.monthly samples of smelt osmerus eperlanus (linnaeus, 1758) were collected from july 1985 to may 1986, in the river elbe (germany), and examined for infections with microsporidians. two microsporidians were found: glugea hertwigi weissenberg, 1911, infecting the digestive tract and pleistophora ladogenis voronin, 1978, infecting the skeletal musculature. g. hertwigi infection led to the formation of xenomas, whereas p. ladogensis was characterized by diffuse infections, with the production of ma ...201627596859
importance of the kidneys in metabolism of vitamins a1 and a2 and their fatty acyl esters in mink feeding on fish-based diets and exposed to aroclor 1242.two-month-old female mink (mustela vison) were fed diets based on freshwater smelt (osmerus eperlanus), baltic herring (clupea harengus membras), or north-atlantic herring (clupea harengus harengus) for 21 weeks. half of the smelt-fed mink were exposed to the commercial polychlorinated biphenyl (pcb) preparation aroclor 1242 (1 mg/day) in the feed. retinol (vitamin a(1)), 3,4-didehydroretinol (vitamin a(2)), their fatty acyl esters, and vitamin e were studied in the kidneys by reversed-phase hig ...200312649044
a novel fish herpesvirus of osmerus eperlanus.a herpesvirus of smelt (osmerus eperlanus) was identified by thin section electron microscopy. degenerated cells of skin lesions located on the back fin of smelt showed either intranucleic- or cytoplasmic herpesvirus-specific structures. in the nuclei "naked" virus capsids with a diameter of about 100 nm were observed. the diameter of the complete virion including its unilaterally extended envelope ranged from 200 to 350 nm. remarkably, in complete virions the electron-opaque tegument is complet ...201020480219
acute infection by glugea hertwigi weissenberg in young-of-the-year rainbow smelt, osmerus eperlanus mordax (mitchill). 19676070675
sealworm pseudoterranova decipiens s.s. infection of european smelt osmerus eperlanus in german coastal waters: ecological implications.european smelt osmerus eperlanus (n = 501) from the german wadden sea (north sea) near the city of cuxhaven were examined for their infestation with parasitic anisakid nematodes, especially with sealworms of the genus pseudoterranova. the distribution of third-stage larvae (l3) in the musculature and viscera of the fish was analyzed. in total, we isolated 543 l3 from the hosts' body cavity and musculature. a subsample of 105 larvae were identified as the (sibling) species p. decipiens s.s. using ...201323446971
uptake and distribution of radioiodine, and the effect of ambient nitrate, in some fish species.125i uptake by the thyroid was most pronounced in the smelt (osmerus eperlanus), perch (perca fluviatilis), rainbow trout (salmo gairdneri), roach (rutilus rutilus) and bleak (alburnus alburnus). unlike other tissues, only the muscle in the species studied no relative accumulation of 125i as compared to the ambient water. the crusian carp (cyprinus carassius) indicated the lowest levels of accumulation of 125i among the species tested. thyroid radioiodine concentration was independent of the len ...19852858311
eye fluke-induced cataracts in natural fish populations: is there potential for host manipulation?manipulation of host phenotype (e.g. behaviour, appearance) is suggested to be a common strategy to enhance transmission in trophically transmitted parasites. however, in many systems, evidence of manipulation comes exclusively from laboratory studies and its occurrence in natural host populations is poorly understood. here, we examined the potential for host manipulation by diplostomum eye flukes indirectly by quantifying the physiological effects of parasites on fish. earlier laboratory studie ...201120800013
selective transfer of polyunsaturated fatty acids from phytoplankton to planktivorous fish in large boreal lakes.lake size influences various hydrological parameters, such as water retention time, circulation patterns and thermal stratification that can consequently affect the plankton community composition, benthic-pelagic coupling and the function of aquatic food webs. although the socio-economical (particularly commercial fisheries) and ecological importance of large lakes has been widely acknowledged, little is known about the availability and trophic transfer of polyunsaturated fatty (pufa) in large l ...201526282609
[microevolutionary aspects of morphological variability and specificity of cestodes by the example of proteocephalus longicollis (zeder, 1800) (proteocephalidae), a parasite of coregonids].morphological variability of the cestode proteocephalus longicollis from the smelt osmerus eperlanus l., which was spontaneously introduced into the syamozero lake, has been studied. it was established that p. longicollis became an abundant element of the smelt parasite fauna during last 20 years, thereby showing the absence of host specificity. it was revealed that morphological polymorphism of p. longicollis from smelt combines features of ecological forms characteristic for aboriginal host sp ...201020795485
recruitment of pelagic fish in an unstable climate: studies in sweden's four largest lakes.pelagic fish population biology was studied in the large swedish lakes vänern, vättern, mälaren and hjälmaren. it is crucial for fish fry in temperate regions to hatch early in the growth season to survive, and achieve large size before winter, and it is suggested that the key factors are to match the spring development of phyto- and zooplankton, but to avoid predation. this is more easily accomplished by the studied spring spawners smelt (osmerus eperlanus) and pike-perch (stizostedion lucioper ...200111878031
[resource availability and its role in development of invasion processes].the state of biotic communities inhabiting different water bodies is analyzed aiming to determination of conditions facilitating development of biological invasions. mass-balance and dynamic models are used to reveal the factors ensuring the invasion of zebra mussel, dreissena polymorpha, in naroch lakes (byelorussia), and smelt, osmerus eperlanus, in lake syamozero (karelia). the results obtained indicate that for invasions leading to trophic chain lengthening, the main factor of successful inv ...201021061642
invalidation of diphyllobothrium hottai (cestoda: diphyllobothriidae) based on morphological and molecular phylogenetic analyses.diphyllobothrium hottai yazaki, fukumoto & abe, 1988 was described based on the morphology of adult worms recovered from golden hamsters that had been experimentally infected with plerocercoids obtained from japanese surf smelts (hypomesus pretiosus japonicus) and olive rainbow smelts (osmerus eperlanus mordax). although d. hottai was considered to be distinct from diphyllobothrium ditremum (creplin, 1825), their taxonomic relationship requires further clarification. in our study, d. hottai and ...201627353020
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