molecular evolution of glycogen phosphorylase and aminotransferases of vertebrate muscle tissue.comparative biochemical studies on phosphorylase b, aspartate aminotransferase and alanine aminotransferase in muscles of various vertebrates (the lamprey lampetra fluviatilis, dogfish squalus acanthias, rays dasyatis pastinaca and raja clavata, teleosts scorpaena porcus, spicara smaris, esox lucius, tinca tinca, abramis brama, lucioperca lucioperca, cyprinus carpio, salmo ischchan, frog rana temporaria, tortoise testudo horsfieldi) revealed some peculiarties of their molecular evolution. it was ...197717251
presence of dna polymerase in lymphosarcoma in northern pike (esox lucius).northern poke lymphosarcoma dna polymerase was partially purified from particulate fractions banding at 1.15 to 1.16 g/ml from homogenates prepared from frozen necropsies of tumor-bearing pike. the enzyme behaves as a typical reverse transcriptase, in that it prefers ribotemplates to deoxytemplates. the isoelectric point (pl 5.5) is similar to that of avian myeloblastosis virus polymerase. the pike enzyme elutes from a phosphocellulose column at 0.22 m potassium phosphate, the same as avian myel ...197769492
immunological and ultrastructural characterization of true histiocytic lymphoma in the northern pike, esox lucius epidemic of a malignant neoplasm occurs in northern pike, esox lucius l., from the aland islands of finland. the neoplasm is morphologically similar to other pike hemic tumors reported in other areas of the world. pike normal tissues showed evolutionary conservation with the mammalian intermediate filament proteins cytokeratin, desmin, vimentin, neurofilament protein, and glial fibrillary acidic protein; tumor cells are positive for vimentin, suggesting that the neoplasm is of mesenchymal ori ...19902201440
helminth position within the intestine of naturally infected pike (esox lucius) relative to host stomach contents.the positions of 3 cestode species, triaenophorus crassus forel, triaenophorus nodulosus (pallas), and proteocephalus pinguis larue, and a nematode, raphidascaris acus (bloch), within the intestine of naturally infected pike (esox lucius l.) were evaluated with respect to the presence or absence and state of digestion of host stomach contents. the positions of scolices and strobilae of the cestodes did not vary with respect to host stomach contents. by contrast, r. acus was anterior (near the st ...19892614600
[tracheliastes polycolpus nordm. 1832 (lernaeopodidae) in the narew river].in the course of ichthyological inventory investigations in the main water-course of the narew river the occurrence of tracheliastes polycolpus nordm. was recorded on ide leuciscus idus (l.) and pike esox lucius l. a comparison of the occurrence of this parasite in other rivers of poland is presented.19892728457
radiocesium in muscle tissue of reindeer and pike from northern sweden before and after the chernobyl accident. a retrospective study on tissue samples from the swedish environmental specimen bank.after the chernobyl accident in april 1986, considerable deposition of radionuclides occurred regionally in eastern, central and northwestern sweden. locally, the fallout of radiocesium exceeded the remainder from atmospheric nuclear weapons tests by several magnitudes. since the end of the 1960s samples of organs from various plant and animal species, annually collected at different localities, have been preserved in the swedish environmental specimen bank (esb). in this work samples from the e ...19921604304
new species in genus azygia looss, 1899 (trematoda, azygiidae)a new species azygia inopinata is described from esox lucius the species was found in two lakes of southern karelia. marita is characterized by the equality of suckers and globular pharynx; the average size of eggs is 0.061 x 0.033 mm. the intermediate host(in the experiment) is galba plaustris. the larva is cercaria mirabilis braun.1975130603
triaenophorus nodulosus and t. crassus in fish from northern finland.10,288 fish specimens of 34 species from three water bodies in northern finland were studied mainly in 1978-1982 triaenophorus nodulosus and t. crassus parasites. six of the 31 species from the bothnian bay were found to harbour t. nodulosus plerocercoids, four of the 11 from the cold, oligotrophic lake yli-kitka in northeastern finland and only one of the 6 from the small, eutrophic lake kuivasjärvi. the ruff (gymnocephalus cernuus) was most essential intermediate host in the lakes, as supporte ...19892488051
noradrenaline, dopamine, 5-hydroxytryptamine and tryptophan concentrations in the brains of four cohabiting species of fish.1. the concentrations of the neurotransmitters noradrenaline, dopamine and 5-hydroxy-tryptamine and the amino acid tryptophan were determined in the telencephalon, optic lobes and rest of the brains of four species of fish collected from a stream in central saskatchewan. 2. the species investigated were white sucker (catostomus commersoni), longnose sucker (catostomus catostomus), longnosed dace (rhinichthys cataractae) and northern pike (esox lucius). 3. significant differences were found in th ...19882898995
the primary structure of the parvalbumin ii of pike (esox lucius).the amino acid sequence of the parvalbumin ii of the pike is reported. the protein has a molecular weight of 11 435. it consists of a single polypeptide chain of 107 amino acid residues with an acetyl group blocking the n-terminus and an alanine residue at the c-terminus. the molecule has been enzymically cleaved by trypsin, thermolysin and by the protease of the staphylococcus aureus strain v8. chemical cleavages make use of the cnbr reaction and of the sulfocyanoethylation method. the comparis ...19761009932
cutaneous tumor of northern pike, esox lucius l. ii. expression of surface and cytoplasmic immunoglobulins and alpha-naphthyl acetate esterase by mononuclear cells from lymphoid tissues and tumor.rabbit anti-pike igm antibodies showed that up to 95% of mononuclear (mn) cells isolated on ficoll-isopaque gradients from peripheral blood, spleen, and head kidney of northern pikes carrying cutaneous tumors were surface (sig) and cytoplasmic (cig) immunoglobulin positive by indirect immunofluorescence. on the contrary, rabbit anti-winter flounder igm antibodies gave totally negative results. monoclonal anti-carp igm antibodies stained approximately 40-56% of peripheral blood, splenic, and head ...19883350193
micronuclei induction in pike (esox lucius) in swedish lakes contaminated with radiocaesium.micronuclei frequency in fish from swedish lakes with high concentrations of radiocaesium was investigated. the frequency of micronucleus induction in fish varied in different lakes but was not correlated with caesium concentrations.19921511626
purification and subcellular localization of zn-dependent acid p-nitrophenylphosphatase in frog liver and comparison with other vertebrates.zn2(+)-dependent acid p-nitrophenylphosphatase (zn-acpase) from liver of rana esculenta was purified to homogeneity. the purified enzyme moves as a single electrophoretic band at ph 8.3 in 7.5% acrylamide and was coincident with the enzyme activity. the enzyme has a molecular weight of 102,000 +/- 5,000d and is a dimer with two apparently similar polypeptide chains of 48,000 +/- 3,000d as determined by sodium dodecylsulfate gel electrophoresis. zn-acpase from frog liver requires zn2+ ions for ca ...19902161444
[cytochemical characteristics of the labrocyte-like cells in the capsule of the plerocercoids of triaenophorus nodulosus (pallas, 1781) and diphyllobothrium dendriticum (nitzsch, 1824) cestodes].out of six fish species examined (esox lucius, paracottus kessleri, perca fluviatilis, leuciscus leuciscus baicalensis, coregonus autumnalis migratorius, thymallus arcticus baicalensis) labrocyte-like cells were detected in esox lucius, leuciscus leuciscus baicalensis, coregonus autumnalis migratotius. the cells contain large metachromatic granules. histochemical methods revealed in them sulfated and carboxylic acid mucopolysacharides. the amount of labrocyte-like cells in the capsules around pl ...1977143258
raphidascaris acus (bloch, 1779) in northern pike, esox lucius l., walleye, stizostedion vitreum vitreum (mitchill), and yellow perch, perca flavescens (mitchill), from central canada. 19863735597
[thyroid homeostasis in animals with iodine deficiency].the content of total iodine, its hormonal and nonhormonal fractions as well the level of protein-bound iodine in blood and basic tissue targets in representatives of 4 classes of animals: esox lucius l., rana esculenta, streptopelia decaocto priv., lepus europaeus pall. inhabiting the mountain regions with iodine deficiency in environment and in the lowlands of transcarpathia with higher iodine provision have been investigated. a considerable decrease of general and hormone iodine level in the a ...19883265636
epizootiological and experimental studies of skin tumours in northern pike (esox lucius l.) in the baltic sea. 1976981688
[morphological characteristics and certain biological problems of the representatives of the genus apiosoma (infusoria, peritricha) from the young of predatory fishes].13 species of apiosoma were recorded from the young of esox lucius, lota lota and perca fluviatilis. 7 species were reported from lota lota, 9 species-from esox lucius and 6 species--from perca fluviatilis. apiosomes were found mainly on the body surface and fins of fishes and move seldom on their gills. under changing conditions the transition of parasites from one organ to another is possible. great morphological variability of apiosoma is reflected in variability of shape and size of the body ...1976138836
histochemical localization of alpha-amylase in the pancreas of pike (esox lucius) by indirect immunofluorescence.alpha-amylase is an enzyme, rarely detected histochemically. only a few examples are known in mammals. a method is described for the histochemical detection of an alpha-amylase in the pancreas of pike using a rabbit antiserum against pike amylase and fitc-labelled anti-rabbit immunoglobulin.19892516685
growth, morphology and division of flagellates of the genus trypanoplasma (protozoa, kinetoplastida) in vitro.nine strains of trypanoplasms were grown in axenic culture. cultures of trypanoplasma borreli laveran and mesnil, 1901 from fish hosts blicca bjoerkna, cyprinus carpio, scardinius erythrophthalmus and tinca tinca and of t. guerneyorum minchin, 1909 from esox lucius and trypanoplasma spp. from the leech piscicola geometra were maintained in biphasic blood-agar medium snb-9 supplemented with vitamins and antibiotics. in culture, the flagellates transformed into smaller, elongated stages with a lit ...19902217113
extraction of a secretinlike factor from the intestines of pike (esox lucius). 19744851988
vector specificity of trypanosoma catostomi and its infectivity to freshwater fishes.trypanosoma catostomi was found in 36.2% of 558 white suckers (catostomus commersoni) from ontario, canada. the abundance of actinobdella inequiannulata was 35% (68 leeches/197 suckers examined for leeches). the susceptibility of 3 species of leeches (hemiclepsis marginata, desserobdella phalera, and a. inequiannulata) and 7 species of fishes (c. commersoni, amia calva, anguilla rostrata, ictalurus nebulosus, oncorhynchus mykiss, perca flavescens, and esox lucius) to infection with t. catostomi ...19921738075
the hepatic glutathione content and glutathione s-transferase activity in the pike (esox lucius l.) and rat.1. the content of glutathione and glutathione disulfide and the activity of the glutathione s-transferase were determined in the liver of pike and rat. 2. it was found that the liver of pike contains far less glutathione than the liver of rats, while the glutathione disulfide content was similar in both species. 3. the activity of the hepatic glutathione s-transferase was more effective in pike than in rats.19911764906
morphological patterns in the developing vertebrate retina.changes in the morphology of the early optic cup were observed in embryos of two distantly-related vertebrate species, a teleost fish, northern pike (esox lucius), and chicken (gallus gallus). a similar morphological pattern was noted to appear in both species shortly after the involution of the optic vesicle and the formation of the inner retinal layer. at a gross level, three notches were observed in the retinal margin at approximately nasal, dorsal, and temporal positions, while in histologic ...19911741476
tumors in fish caught in polluted waters: possible explanations.the largest excess in tumor incidence due to pollution (616%) was observed in the fish species: ictalurus nebulosis (the brown bullhead). extensive analysis of waters on the fox river in illinois disclosed a heavy chemical and physical organic and inorganic materials far exceeding state and federal minimal safety standards. additional tests showed the presence of numerous human viral agents in the fox river. certain chemicals in the water appear to be potential carcinogens for fish. two types of ...19751174315
hormonal and metabolite effects on plasma free fatty acids in the northern pike, esox lucius l. 19751205116
[the causes of the formation of an intensive focus of triaenophoriasis in the upper tuloma river reservoir].observations on the triaenophorus crassus invasion in coregonus lavaretus and esox lucius were carried out in the period of 1984 to 1989 in the upper tuloma river [correction of verkhnetulomsk] water reservoir and pechozero water body (the pecha river) which form a common basin. significant differences were noted in the infection rate of fishes with this parasite in the above water bodies. in pechozero, where there are preserved natural conditions and therefore an ecological equilibrium in the h ...19911839932
isolation and characterization of infectious pancreatic necrosis virus from pike (esox lucius).a nonenveloped icosahedral virus measuring 60 (+/-5)nm in diameter has been isolated from pike fry (esox lucius). the isolate is stable to heat, lipid solvent and acid. iododeoxyuridine has no effect on its replication. serologically, the virus related to the major european strains of infectious pancreatic necrosis virus (ipn) sp and ab. the isolate is neutralized by normal trout serum and is not pathogenic for trout fry or for young pike. a line of chse-214 cells persistently infected with the ...1978697575
a model for the turnover of 137cs and potassium in pike (esox lucius). 1978748259
studies of the etiology and epizootiology of lymphosarcoma in esox (esox lucius l. and esoxmasquinongy). 1976790463
skin tumours of northern pike (esox lucius l.). i. sarcoma in a baltic pike population. 19685752913
cylindroid lamella-particle complexes in lymphoma cells by northern pike (esox lucius).cells of the malignant lymphoma of northern pike of canada contained cylindrical structures with central cores of cytoplasmic elements and walls composed of lamellae in a spiral arrangement, separated by ribosome-like particles or by membranes. these cylindroids were similar, if not identical, to structures in the cells of certain human lymphomas and leukemias. in cross and longitudinal sections, the lamellae showed a pattern of light and dark bands resulting in an approximately 95 a-period that ...1976187772
morphological survey of teleost organs important in carcinogenesis with attention to fixation.key features of the gross and microscopic anatomy of teleost liver, digestive tract, kidney, and skin were reviewed from the world literature. illustrations of the above and new findings were obtained from light as well as scanning and transmission electron micrographs of tissues from 7 freshwater fish species: alosa sapidissima, american shad; esox lucius, northern pike; lepomis macrochirus, bluegill sunfish; pimephales promelas, fathead minnow; stizostedion vitreum, walleye; oryzias latipes, j ...19846087142
initial characterization of drug-metabolizing systems in the liver of the northern pike, esox lucius.nadph-cytochrome c reductase, cytochrome -450, benzo[a]pyrene mono-oxygenase, epoxide hydratase, and glutathione s-transferase activities in the liver of the northern pike (esox lucius) have been measured and partially characterized. the level of these systems in pike liver is between 13.2 and 133% of the corresponding levels in rat liver, with the exception of glutathione s-transferase, whose specific activity in the high-speed supernatant fraction of pike liver is 305% of that in rat liver. in ...19806103796
preparation and characterization of subcellular fractions from the head kidney of the northern pike (esox lucius), with particular emphasis on xenobiotic-metabolizing enzymes.the present study was designed to prepare and characterize subcellular fractions from the head kidney of the northern pike (esox lucius), with special emphasis on the preparation of a microsomal fraction suitable for studying xenobiotic metabolism. the purity of the different fractions obtained by differential centrifugation as well as the recovery of different cell components was determined using both enzyme markers and morphological criteria. finally, the subcellular distributions of several d ...19852983737
immunological classification of a pike lymphoma.monoclonal and polyclonal antibodies against mammalian intermediate filament (if) proteins were used to demonstrate if expression in tissues and lymphoma tumors of northern pikes, esox lucius l., from the aland islands of finland by indirect immunofluorescence microscopy. frozen sections of pike tissues demonstrated ifs in a manner confirming their evolutionary conservation and subclass specificity. tumor cells showed morphological resemblance to head kidney cells and were positive for vimentin ...19863765362
a comparative study on glyoxalase ii from vertebrata.s-2-hydroxyacylglutathione hydrolase (glyoxalase ii) from the liver of animals belonging to the various vertebrate classes (oryctolagus cuniculus, gallus gallus, python molurus, rana esculenta, esox lucius) have been purified from 100,000 g supernatants of liver homogenates, using acetone fractionation and affinity chromatography. subsequent comparative studies were concerned with some molecular and kinetic properties. isoelectric focusing gave evidence for a single form of liver glyoxalase ii i ...19873495432
esox lucius and some other organisms as indicators of mercury contamination in swedish lakes and rivers. 19685761129
interactions of calcium binding proteins, parvalbumin and alpha-lactalbumin, with dipalmitoylphosphatidylcholine vesicles.interactions of ca2+ binding proteins, pike (esox lucius) parvalbumins pi 4.2 and 5.0, and bovine and human alpha-lactalbumins, with dipalmitoylphosphatidylcholine vesicles were studied by means of scanning microcalorimetry and intrinsic tyrosine and tryptophan fluorescence methods. the interactions of pike parvalbumins are modulated by ca2+ and mg2+ binding to the protein and induce some changes in the physical properties of both the proteins and liposomes. liposomes increased thermal stability ...19883396853
hemoglobin heterogeneity in the pike, esox lucius, and isolation of a homogeneous component.the hemolysate of the pike, esox lucius, contains multiple molecular forms of hemoglobin molecules. analytical gel electrofocusing, disc-gel electrophoresis and gel filtration chromatography indicate that the hemoglobin heterogeneity may be due to different charge isomers with mol. wt values similar to that of the human. ion exchange chromatography on cm-cellulose permits to separate a hemoglobin component in a pure form. globin chains analysis of this fraction and their isolation was also repor ...19863791960
[free amino acids in the brain of vertebrates].studies have been made on the content of free amino acids in the brain of the pike esox lucius, frog rana ridibunda, pheasant phasinus colhidus, hare lepus europaeus, as well as their distribution in the white and grey matter of healthy human subjects. differences in the distribution of free amino acid pool were found between man and animals. in the grey matter of human brain, large quantities of free ornithine, phenylalanine, lysine, serine, glycine, alanine, tyrosine, tryptophan, methionine, l ...19846495929
purification and characterization of troponin c from pike muscle: a comparative spectroscopic study with rabbit skeletal muscle troponin c.the conformation of troponin c (tn-c) isolated from the white muscle of pike (esox lucius), in the ca2+ and metal-free states, was studied by circular dichroism, absorption difference spectroscopy, solvent perturbation difference spectroscopy, intrinsic fluorescence, thiol titration, and 1h nuclear magnetic resonance spectroscopy. in addition, the molecular weight of the protein was determined by sedimentation equilibrium and polyacrylamide gel electrophoresis in the presence of sodium dodecyl s ...19827150538
mesophilic aeromonads in wild and aquacultured freshwater fish.numbers and species of motile aeromonas were determined in freshly caught freshwater fish, in the surrounding environment, and also during iced chilled storage of fish specimens. although no significant differences were observed in water samples, initial levels for skin, gill, and intestines were significantly lower in farmed rainbow trout (oncorhynchus mykiss) than in wild brown trout (salmo trutta) and pike (esox lucius). during storage of wild specimens, naturally occurring aeromonads grew fa ...200111348001
[the forms of the population variability of the chitinoid formations in tetraonchus monenteron (monogenea: tetraonchidae)].population variability of the adhesive apparatus and copulatory organ of tetraonchus momenteron from young and adult pikes (esox lucius) from rybinsk reservoir (volga river system) and adult pikes from lake baikal has been studied. comparison analysis of seven plastic and one meristic characters allowed to discover differences between the groups of monogeneans from young and adult pikes from "rybinsk" population by frequently of the variations of number of the tight coils of copulatory organ sup ...19948177612
formation of mutagenic metabolites from benzo(a)pyrene and 2-aminoanthracene by the s-9 fraction from the liver of the northern pike (esox lucius): inducibility with 3-methylcholanthrene and correlation with benzo[a]pyrene monooxygenase activity.the mutagenicity of benzo[a]pyrene and 2-aminoanthracene in the ames test using the s-9 fraction from the liver of the northern pike (esox lucius) was tested. s-9 fractions were prepared both from fish injected intraperitoneally with 3-methylcholanthrene and from control animals. in addition benzo[a]pyrene monooxygenase activity was assayed in the same s-9 fractions used in the ames test. s-9 fractions from the liver of the northern pike were found to convert benzo[a]pyrene and 2-aminoanthracene ...19826284388
concentrations of polychlorinated dibenzo-p-dioxins and furans in fish downstream from a ky-5 manufacturing.concentrations of polychlorinated dibenzo-p-dioxins and dibenzofurans (pcdd/fs) were studied in seven fish species, burbot (lota lota), pike (esox lucius), perch (perca fluviatilis), pikeperch (stizopedion lucioperca), bream (abramis brama), salmon (salmo salar) and baltic herring (clupea harengus membras) in river kymijoki and its estuary polluted by ky-5 manufacturing. the fish were caught at 14 localities along the river and its estuary. the selected species represent different trophic levels ...200111372842
preparation and characterization of subcellular fractions suitable for studies of drug metabolism from the trunk kidney of the northern pike (esox lucius) and assay of certain enzymes of xenobiotic metabolism in these subfractions.the present study was designed to prepare and characterize subcellular fractions from the trunk kidney of the northern pike (esox lucius), with special emphasis on the preparation of a microsomal fraction suitable for studying xenobiotic metabolism. the purity of the different fractions obtained by differential centrifugation, as well as the recovery of different organelles, was determined using both enzyme markers and morphological examination with the electron microscope. finally, the subcellu ...19846431981
the adhesive mechanism of the monogenean parasite tetraonchus monenteron from the gills of the pike (esox lucius). 19665968799
fructose-1,6-bisphosphatase genes in animals.a comparison of the amino acid sequences of the liver and muscle fructose-1,6-bisphosphatase (fbpase) isoforms in primates and rodents suggested an ancient duplication event leading to the corresponding genes. we investigated the presence of both genes in the rabbit (order lagomorphs) and in species belonging to further distantly related metazoan taxa. by an analysis of the available complete genomes and proteomes of the nematode caenorhabditis elegans and of drosophila melanogaster only one seq ...200212095679
transport and subcellular distribution of nickel in the olfactory system of pikes and rats.occupational exposure to nickel by inhalation may result in impaired olfactory sense. recent studies have shown that nickel is transported from the olfactory epithelium along the axons of the primary olfactory neurons to the brain. in the present study 63ni2+ was applied in the olfactory chambers of pikes (esox lucius) and the rate at which the metal was transported in the primary olfactory neurons was determined by beta-spectrometry. the results showed a wave of 63ni2+ in the olfactory nerves, ...19989710961
epidermal hyperplasias of northern pike (esox lucius) associated with herpesvirus and c-type particles.northern pike from several locations in central canada were observed to have two different types of hyperplastic epidermal lesions on the body and fins. one type of epidermal hyperplasia consisted of flat lesions, bluish-white in color with a granular or "gritty" appearance. histological examination of this granular lesion showed the presence of grossly hypertrophied cells surrounded by normal sized epidermal cells. the enlarged nuclei in thin section contained many typical herpesvirus capsids m ...19846320780
the thymus glands and lymphosarcoma in the pike, esox lucius l. (pisces; esocidae) in ireland. 19704142390
time trends of chlordane, ddt, and pcb concentrations in pike (esox lucius) and baltic herring (clupea harengus) in the turku archipelago, northern baltic sea for the period 1971-1982. 19826812672
pathogenicity of the gill artery worm philometra obturans (nematoda) in northern pike (esox lucius) in southwest finland.the pathogenicity of female philometra obturans (prenant, 1886) was investigated. fish samples were taken in may and june 2001 from lake littoistenjärvi, in southwest finland. the intensity of infection varied between 1 and 4 worms, these being found in the afferent artery of the 2 outermost gill arches. the prevalence was 33.9% (n = 59). host condition and tissue reactions were investigated through dissection and analysis of histopathology. the parasites obstructed the gill arteries, and the ar ...200415040689
hemic neoplasms in cold blooded animals: lymphosarcoma in the pike esox lucius. 19705006225
expression of melatonin receptors and 2-[125i]iodomelatonin binding sites in the pituitary of a teleost fish.the mechanisms of the photoperiodic control of fish physiology (growth, reproduction) and behavior (locomotor activity) are far from being understood. we show here that 2-[125i]iodomelatonin binds specifically to membrane preparations from pike (esox lucius, l.) pituitaries (kd: 556 pm; bmax: 2.8 fmol/mg proteins). radioautography indicated that the binding was restricted to a part of the pituitary only. using polymerase chain reaction from pike genomic dna we were able to isolate, subclone and ...199910810501
the distribution and host range of species of the blood fluke sanguinicola in british freshwater fish.the distribution of host range of sanguinicola armata, s. inermis and s. volgensis in british freshwater fish are described. s. inermis has been recorded in carp cyprinus carpio, crucian carp carassius carassius and tench tinca tinca in southern, central and eastern england and in koi carp imported from japan. s. armata has been detected in pike esox lucius and tench and s. volgensis has been found in chub leuciscus cephalus, dace leuciscus leuciscus, perch perca fluviatilis, roach rutilus rutil ...19947706678
development of fish mercury concentrations in finnish reservoirs from 1979 to 1994.mercury (hg) concentrations in burbot (lota lota), perch (perca fluviatilis), northern pike (esox lucius), roach (rutilus rutilus), whitefish (coregonus lavaretus) and peled (c. peled) were monitored in 18 reservoirs situated in western and northern finland over a period of 16 years (1979-1994). the reservoirs were impounded from 1964 to 1980. the surface areas ranged between 1 and 417 km2. data from downstream sites and reference lakes were compared to reservoir mercury data. generally, fish hg ...19989652133
catabolism of fish furan fatty acids to urofuran acids in the rat.a mixture of long-chain furan fatty acids was prepared as methyl esters from testes lipids of northern pike (esox lucius). upon feeding these esters to rats, dicarboxylic acids, which still contained the furan structure, were found in the urine. the first phase of a rapid but incomplete catabolism is beta-oxidation of the proximal chain of the furan fatty acids. it proceeds to a distance of three carbon atoms from the ring. omega-oxidation of the terminal alkyl chain, followed by alpha-oxidation ...19836849955
spatial genetic structure of northern pike (esox lucius) in the baltic sea.the genetic relationships among 337 northern pike (esox lucius) collected from the coastal zone of the central baltic region and the finnish islands of aland were analysed using five microsatellite loci. spatial structure was delineated using both traditional f-statistics and individually based approaches including spatial autocorrelation analysis. our results indicate that the observed genotypic distribution is incompatible with that of a single, panmictic population. isolation by distance appe ...200515910318
temporal changes in mercury bioaccumulation by predatory fishes of boreal lakes following the invasion of an exotic forage fish.we evaluated the prediction that mercury concentrations of predatory fishes in boreal lakes would rise following the invasion of an exotic forage fish species (rainbow smelt, osmerus mordax) that was believed to feed at a higher trophic position than native forage fishes. we compared temporal trends (postinvasion minus preinvasion values) in fish mercury bioaccumulation between lakes experiencing recent smelt invasions and reference lakes of central canada. piscivore mercury concentrations in th ...200312959531
mercury in sediment and fish communities of lake vänern, sweden: recovery from contamination.the past effluents of mercury (hg) into lake vänern were considerable. the consequences of, and recovery from these have been monitored through continuous measurements of mercury in sediment and fish. mercury levels in lake sediments in the vicinity of the main source of mercury, a chloralkali plant on the northern shore, have only decreased by slightly more than a half since the mid-1970s, despite a radical decrease in effluents from the source, already during the 1960s. the mercury levels in p ...200111878028
microwave heated vapor-phase digestion method for biological sample materials.a microwave heated, vapor-phase nitric acid-hydrogen peroxide digestion method for pulverized, biological sample materials was developed. sample masses up to 200 mg were digested using calibrated quartz inserts inside first generation type, low-pressure, teflon-pfa microwave vessels. in the first step, samples were digested in the vapor-phase for 80 min using a progressive heating pattern. three ml of 70% nitric acid and 0.5 ml of 30% hydrogen peroxide were used as digestion reagents. in the sec ...200111210223
preparation and characterization of subcellular fractions from the liver of the northern pike, esox lucius.the present study was designed to prepare and characterize subcellular fractions from the liver of the northern pike (esox lucius), with special emphasis on the preparation of microsomal fractions suitable for studying xenobiotic metabolism. the purity of the different fractions obtained by differential centrifugation, as well as the recovery of different organelles, was determined using both enzyme markers and morphological examination with the electron microscope. attempts were also made to in ...19827092940
comparison of mercury and methylmercury in northern pike and arctic grayling from western alaska western alaska, mercury (hg) could be a potential health risk to people whose diet is primarily fish-based. in 2000, total hg (thg) and methylmercury (mehg) were examined in northern pike (esox lucius) and arctic grayling (thymallus arcticus) from two watersheds in western alaska, the yukon and kuskokwim rivers. whitefish (coregonus sp.) were also examined from the kuskokwim river. pike from the yukon and kuskokwim rivers had mean concentrations of thg in muscle of 1.506 and 0.628 mg/kg wet w ...200312656259
molecular analysis of ependymins from the cerebrospinal fluid of the orders clupeiformes and salmoniformes: no indication for the existence of an euteleost infradivision.ependymins represent the predominant protein constituents in the cerebrospinal fluid of many teleost fish and they are synthesized in meningeal fibroblasts. here, we present the ependymin sequences from the herring (clupea harengus) and the pike (esox lucius). a comparison of ependymin homologous sequences from three different orders of teleost fish (salmoniformes, cypriniformes, and clupeiformes) revealed the highest similarity between clupeiformes and cypriniformes. this result is unexpected b ...19938350351
fish status survey of nordic lakes: effects of acidification, eutrophication and stocking activity on present fish species composition.the status of fish populations in 3821 lakes in norway, sweden and finland was assessed in 1995-1997. the survey lakes were chosen by stratified random sampling from all (126 482) fennoscandian lakes > or = 0.04 km2. the water chemistry of the lakes was analyzed and information on fish status was obtained by a postal inquiry. fish population losses were most frequent in the most highly acidified region of southern norway and least common in eastern fennoscandia. according to the inquiry results, ...200312733793
bacterial microflora of wild brown trout (salmo trutta), wild pike (esox lucius), and aquacultured rainbow trout (oncorhynchus mykiss).initial numbers of bacteria associated with wild (brown trout and pike) and cultured (rainbow trout) freshwater fish as well as with the water in which they were caught were determined. subsequently, a total of 979 randomly selected isolates were characterized and identified to the genus level. for all counts performed (aerobes, psychrotrophs, anaerobes, enterobacteriaceae, and enterococci), no significant differences were observed in water samples, the highest level corresponding to psychrotrop ...199910571316
psychrobacters and related bacteria in freshwater fish.three phenotypic identification systems were employed to identify 106 strains of gram-negative, nonmotile, aerobic bacteria obtained during iced storage of wild (salmo trutta and esox lucius) and farmed (oncorhynchus mykiss) freshwater fish. using diagnostic tables and computer-assisted identification, the isolates were psychrobacter (64 strains), acinetobacter (24 strains), moraxella (6 strains), chryseobacterium (5 strains), myroides odoratus (2 strains), flavobacterium (1 strain), empedobacte ...200010716558
first observation of herpes-like virus particles in northern pike, esox lucius l., associated with bluespot-like disease in ireland.circular whitish granular lesions, 5-12 mm in diameter, were observed on the skin and fins of a wild northern pike, esox lucius, caught in a lake in the republic of ireland. histological examination of the lesions revealed hypertrophied cells in the epidermis with deeply basophilic enlarged nuclei and dark-staining granular material in the cytoplasm. transmission electron microscopy of these cells revealed naked hexagonal herpes-like virus nucleocapsids (97 +/- 7 nm) in their nuclei while the cy ...200415357713
lymphosarcoma in the pike esox lucius l. in ireland. 196414203970
occurrence of monogenea in italian freshwater fish (po river basin).sixteen monogenean species were found on the skin and gills of 10 different fish species collected from north italian water bodies. cleidodiscus pricei from ictalurus melas; dactylogyrus alatus from alburnus alburnus; d. anchoratus, d. formosus and d. vastator from carassius carassius; d. difformis from scardinius erythrophthalmus; d. rutili from rutilus aula; d. tincae and gyrodactylus gasterostei from tinca tinca; d. ergensi from leuciscus cephalus and telestes muticellus; d. vistulae and para ...200212701382
high sensitivity of northern pike larvae to uv-b but no uv-photoinduced toxicity of order to investigate whether increased uv-b radiation is a risk factor, a series of acute laboratory experiments was conducted with larval stages of the northern pike (esox lucius l.), hatching in nordic waters in may. further, a comparative investigation on the acute phototoxicity of retene (7-isopropyl-1-methylphenanthrene), a pah compound recently revealed to posses uv-b-induced phototoxicity in larval coregonids, was conducted with pike larvae. in semi-static experiment, larvae were pre-e ...200415168947
organochlorine concentrations in the saimaa ringed seal (phoca hispida saimensis) from lake haukivesi, finland, 1981 to 2000, and in its diet today.organochlorine and mercury (hg) pollution has been one possible reason for a decline in the size of the population of the saimaa ringed seal (phoca hispida saimensis) in lake haukivesi, finland. in this study, we analyzed changes in the concentrations of organochlorine compounds (ocls) and extractable organic halogen (eox) in the blubber of saimaa ringed seals that died from 1981 to 2000. in addition, the present concentrations and biomagnification factors of ocls and hg from the main prey fish ...200212109735
boating and navigation activities influence the recruitment of fish in a baltic sea archipelago area.we studied the effects of boating and navigation activities on the recruitment of coastal fish in the stockholm archipelago in the nw baltic proper. the impacts were quantified by sampling metamorphosed young-of-the-year (y-o-y) fish in inlets adjacent to i) routes for medium-sized passenger ferries; ii) berths (small marinas) with small boats; and iii) references. species with high preference for vegetation were negatively influenced by boating and navigation activities and species with low pre ...200515865309
endocrine (sexual) disruption is not a prominent feature in the pike (esox lucius), a top predator, living in english waters.the high incidence of intersex roach (rutilus rutilus) in some united kingdom rivers that has been associated with exposure to sewage treatment works (stws) effluent led us to hypothesize that top predator fish also may be affected by estrogenic chemicals, because they are likely to bioaccumulate lipophilic compounds through a predator-prey relationship. to investigate this possibility, pike (esox lucius) were sampled both upstream and downstream of stws and then examined for total estrogenic ac ...200516117120
[taxonomic characteristics and physiological properties of microorganisms from the gut of pike (esox lucius)].the taxonomic composition and distribution of microorganisms differing in the degree of association with the intestinal mucosa of the pike (lucius lucius) has been studied. microorgansism of the families enterobacteriaceae, aeromonadaceae, and vibrionaceae dominate in the gut microflora. numerically prevailing bacterial species are characterized by high proteolytic and amylolytic enzyme activities as well as by high persistence accounted for by antilysozyme and antihistone activities. the result ...200819198074
bioinformatic and enzymatic characterization of the mapeg superfamily.the membrane associated proteins in eicosanoid and glutathione metabolism (mapeg) superfamily includes structurally related membrane proteins with diverse functions of widespread origin. a total of 136 proteins belonging to the mapeg superfamily were found in database and genome screenings. the members were found in prokaryotes and eukaryotes, but not in any archaeal organism. multiple sequence alignments and calculations of evolutionary trees revealed a clear subdivision of the eukaryotic mapeg ...200515794756
trophic transfer of cyanobacterial toxins from zooplankton to planktivores: consequences for pike larvae and mysid shrimps.the aim of this study was to evaluate the potentially harmful effects of zooplankton preexposed to cyanobacteria on two planktivorous animals: a fish larva (pike, esox lucius) and a mysid shrimp (neomysis integer). the planktivores were fed zooplankton from a natural community that had been preexposed to cell-free extract or to purified toxin (nodularin) of the cyanobacterium nodularia spumigena, and the growth, feeding, and pellet production of the planktivores, as well as the toxin content of ...200515892036
[seasonal distributions and effects of parasites in pike (esox lucius l., 1758) inhabiting the işikli dam lake (denizli).]the aim of this study carried out from december 2000-november 2001 was to determine the endoparasites of pike (esox lucius l., 1758) inhabiting the işikli dam lake. a total of 160 samples were caught and investigated parasitologically. bathybothrium rectangulum (cestoda), raphidascaris acus, camallanus truncatus (nematoda) and neoechinorhynchus rutili (acanthocephala) were detected as a result of this study. r. acus was the most prevalent species. the highest seasonal infection in the pike sampl ...200517124691
the effect of high ph on ion balance, nitrogen excretion and behaviour in freshwater fish from an eutrophic lake: a laboratory and field study.slapton ley is a freshwater hyper-eutrophic lake of two basins connected by a narrow channel. one part of the lake experiences summer blooms of cyanobacteria and poor water quality, including elevated water ph (maximum ph recorded=10.54), the other part is shaded by reed beds, and remains clear and neutral. this study used laboratory and field physiological measurements together with radio-tracking to investigate the potential impacts of alkaline ph on the physiology and behaviour of fish from s ...200515892990
four decades of opposing natural and human-induced artificial selection acting on windermere pike (esox lucius).the ability of natural selection to drive local adaptation has been appreciated ever since darwin. whether human impacts can impede the adaptive process has received less attention. we tested this hypothesis by quantifying natural selection and harvest selection acting on a freshwater fish (pike) over four decades. across the time series, directional natural selection tended to favour large individuals whereas the fishery targeted large individuals. moreover, non-linear natural selection tended ...200717498150
accumulation of some heavy metals in raphidascaris acus (bloch, 1779) and its host (esox lucius l., 1758).concentrations of some heavy metals (fe, zn, cu, mn and cr) in liver of pike (esox lucius l., 1758) and its endoparasite [raphidascaris acus (bloch, 1779)] inhabiting işikli lake (turkey) were analyzed using atomic absorption spectrophotometry. only fe and zn were detected in r. acus and liver of fish, while levels of cu, mn and cr were below detection limit (<0.028). the fe and zn level in r. acus were 68.4 and 86.9 times higher than in the liver. nematodes could provide reliable information ab ...200718224628
lymphosarcoma in the pike, esox lucius l., (pisces; esocidae) in ireland. 196314122935
susceptibility of pike esox lucius to a panel of ranavirus order to study the pathogenicity of ranaviruses to a wild european freshwater fish species, pike esox lucius fry were challenged with the following ranavirus isolates: epizootic haematopoietic necrosis virus (ehnv), european sheatfish virus (esv), european catfish virus (ecv), pike-perch iridovirus (ppiv), new zealand eel virus (nzeelv) and frog virus 3 (fv3). the fry were infected using bath challenge at 12 and 22 degrees c. significant mortalities were observed at 12 degrees c for ehnv, esv ...200919402450
coexistence of behavioural types in an aquatic top predator: a response to resource limitation?intra-population variation in behaviour unrelated to sex, size or age exists in a variety of species. the mechanisms behind behavioural diversification have only been partly understood, but density-dependent resource availability may play a crucial role. to explore the potential coexistence of different behavioural types within a natural fish population, we conducted a radio telemetry study, measuring habitat use and swimming activity patterns of pike (esox lucius), a sit-and-wait predatory fish ...200919609567
mercury in fishes of alaska, with emphasis on subsistence the north, the presence of mercury (hg) in food leading to chronic exposure is a scientific, economic and political issue. guidelines have been established for the safe consumption of fish containing hg, however, adherence to these guidelines must be weighed against the health benefits of consuming fish, such as from the omega-3 polyunsaturated fatty acids, vitamins and minerals. alaskan natives generally consume much more fish than the national average. this review summarizes and synthesizes ...200717825359
molecular faunistics of accidental infections of gyrodactylus nordmann, 1832 (monogenea) parasitic on salmon salmo salar l. and brown trout salmo trutta l. in nw russia.salmon salmo salar l. and brown trout s. trutta l. juveniles were examined for the presence of accidental monogenean ectoparasitic species of gyrodactylus nordmann, 1832 in the baltic and white sea basins of russian karelia in order to estimate the frequency of host-switching attempts on an ecological timescale. to collect phylogeographical information and for exact species identification, the parasites were characterised by nuclear internal transcribed spacer sequences of rdna (its) and, for so ...200818038199
invalidity of three palaearctic species of triaenophorus tapeworms (cestoda: pseudophyllidea): evidence from morphometric analysis of scolex hooks.a comparative study of the scolex hook morphology of five species of tapeworms of the genus triaenophorus rudolphi, 1793 (cestoda: pseudophyllidea), parasites of pikes (esox lucius l. and e. reichertii dybowski) in the palaearctic region, was carried out. measurements of scolex hooks of 81 plerocercoids and 492 adults from different hosts and regions were compared using basic statistics and forward stepwise linear discriminant analysis. the shape of the scolex and that of tridental hooks were fo ...200717441435
spermiogenesis and sperm ultrastructure of the pseudophyllidean cestode triaenophorus nodulosus (pallas, 1781).spermiogenesis and ultrastructure of the spermatozoon of the pseudophyllidean cestode triaenophorus nodulosus (pallas, 1781), a parasite of pike esox lucius, has been studied by transmission electron microscopy. spermiogenesis involves firstly the formation of a zone of differentiation with two centrioles associated with striated roots, and an intercentriolar body between them, subsequent growth of the two flagella of unequal length, and a formation of a median cytoplasmic process exhibiting pat ...200516240127
arsenic concentration and speciation in five freshwater fish species from back bay near yellowknife, nt, canada.the concentration of total arsenic and five different arsenic species [as(iii), as(v), monomethylarsonic acid (mma), dimethylarsenic acid (dma), and arsenobetaine (asb)], were measured in the muscle, liver and gastrointestinal tract (git) of five different fish species [lake whitefish (coregonus clupeaformis), walleye (stizostedion vitreum), northern pike (esox lucius), white sucker (catostomus commersoni) and longnose sucker (catostomus catostomus)] from back bay, great slave lake, near the cit ...200818214701
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
environmental factors regulate the effects of roach rutilus rutilus and pike esox lucius on perch perca fluviatilis populations in small boreal forest this study of 18 small boreal forest lakes, the effects of abiotic and biotic factors (roach rutilus rutilus and pike esox lucius) on various population variables of perch perca fluviatilis were examined. as a single variable, the gillnet catch per unit effort (cpue) of r. rutilus was negatively related to the mean mass of small (< 200 mm) and the growth rate of young (1-2 years) p. fluviatilis. the mean mass of large (> or = 200 mm) p. fluviatilis was the highest at intermediate cpue of r. r ...201020537014
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
differential habitat use and antipredator response of juvenile roach (rutilus rutilus) to olfactory and visual cues from multiple predators.the indirect, behavioral effects of predation and predator-predator interactions can significantly alter the trophic ecology of many communities. in numerous instances, the strength of these effects may be determined by the ability of prey to identify predation risk through predator-specific cues and respond accordingly to avoid capture. we exposed juvenile roach (rutilus rutilus), a common forage fish in many brackish and freshwater environments, to vision and/or olfactory cues from two predato ...201020127367
assessment of larval deformities and selenium accumulation in northern pike (esox lucius) and white sucker (catostomus commersoni) exposed to metal mining effluent.uranium mining and milling operations in northern saskatchewan (canada) release effluents with elevated levels of certain trace metals and metalloids, including selenium. the goal of the present study was to evaluate the presence of selenium-induced deformities in northern pike (esox lucius) and white sucker (catostomus commersoni) larvae originating from adults collected downstream of a uranium mine. eggs were fertilized in the field and incubated in the laboratory following a two-way (crossove ...200918939891
transmission of tetracapsuloides bryosalmonae (myxozoa: malacosporea) to fredericella sultana (bryozoa: phylactolaemata) by various fish species.tetracapsuloides bryosalmonae is a myxozoan parasite of salmonids and freshwater bryozoans, which causes proliferative kidney disease (pkd) in the fish host. to test which fish species are able to transmit t. bryosalmonae to bryozoans, an infection experiment was conducted with 5 pkd-sensitive fish species from different genera. rainbow trout oncorhynchus mykiss, brown trout salmo trutta, brook trout salvelinus fontinalis, grayling thymallus thymallus and northern pike esox lucius were cohabitat ...200818500029
quantitation of ranaviruses in cell culture and tissue samples.a quantitative real-time pcr (qpcr) based on a standard curve was developed for detection and quantitation of ranaviruses. the target gene for the qpcr was viral dna polymerase (dnapol). all ten ranavirus isolates studied (epizootic haematopoietic necrosis virus, ehnv; european catfish virus, ecv; european sheatfish virus, esv; frog virus 3, fv3; bohle iridovirus, biv; doctor fish virus, dfv; guppy virus 6, gv6; pike-perch iridovirus, ppiv; rana esculenta virus italy 282/i02, rev282/i02 and shor ...201021087639
microwave-assisted double insert vapour-phase digestion of organic samples.a microwave-assisted double insert multimode vapour-phase digestion method was developed for the digestion of organic samples. the experimental set-up was based on a third generation-type teflon microwave vessel, equipped with an automatic pressure regulating type vessel cover. a borosilicate glass holder insert, containing a smaller quartz sample insert, was fitted inside the vessel. sulphuric acid was added to the holder insert as a microwave absorbing and temperature transferring liquid, whic ...200919185121
selective exploitation of large pike esox lucius--effects on mercury concentrations in fish populations.the present study outlines two main trends of mercury transfer patterns through the fish community: 1) the hg concentrations increase with increase in the trophic level, with top predators having the highest concentrations, and 2) a fast growth rate may dilute the concentrations of hg in fish muscle tissue (growth biodilution). in 2004, an extensive reduction in number of large pike (esox lucius l.), was initiated by selective gillnet fishing in lake arungen, norway, in order to increase the pik ...200818485450
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