| variability of hard parts of opisthaptor of two species of gyrodactylus nordmann, 1832 (monogenoidea) from phoxinus phoxinus (l.). | the morphological and metrical variability of hard parts of opisthaptor was studied in the representatives of local populations of gyrodactylus aphyae malmberg, 1957 and g. macronychus malmberg, 1957. the changes within the range of variability, which were observed during the year, correspond to regular and periodical changes in the environmental temperatures. the hard parts of opisthaptor were much smaller in specimens occurring during warm seasons than in specimens occurring during cold season ... | 1976 | 1278817 |
| cerebrospinal fluid-contacting neurons, sensory pinealocytes and landolt's clubs of the retina as revealed by means of an electron-microscopic immunoreaction against opsin. | opsin-immunoreactive sites of hypothalamic cerebrospinal fluid (csf)-contacting neurons, pinealocytes and retinal cells were studied in various vertebrates (carassius auratus, phoxinus phoxinus, triturus cristatus, bombina bombina, rana esculenta) by means of postembedding immuno-electron microscopy with the use of the protein a-gold labeling method. the retina of the rat served as a general reference tissue for the quality of the immunocytochemical reaction. a strong opsin immunoreaction (rat-a ... | 1983 | 6226359 |
| the distribution of the metacercariae of diplostomum phoxini in the brain of minnows, phoxinus phoxinus. | quantitative data are presented on the spatial distribution of metacercariae of the digenean trematode diplostomum phoxini (faust, 1918) in the brains of minnows, phoxinus phoxinus (linnaeus, 1758), from two scottish populations. sequential examination of serial histological sections revealed metacercariae to be unevenly distributed throughout the brain, aggregating in specific regions including the cerebellum, the medulla oblongata and the optic lobes. in addition, a number of metacercariae wer ... | 1997 | 9229570 |
| long-term recovery of macrobenthos and fish assemblages after water pollution abatement measures in the river petite baïse (france). | riverine ecosystems are subject to a large variety of man-made influences, and in recent years a new public awareness of the need to protect rivers has emerged within the industrialized world. the present study focuses on the effect of abatement of pollution from one factory on the recovery of fish and macroinvertebrate species richness in the river petite baïse over a 20-year period (1973-1993). until 1973, the petite baïse (75 km in length) received not only factory waste (nitrogenous rich eff ... | 1997 | 9353205 |
| the ecology of diplostomum phoxini infections in two minnow (phoxinus phoxinus) populations in scotland. | data are presented on the infection dynamics of the brain-dwelling metacercariae of diplostomum phoxini (digenea: trematoda) parasitizing european minnow (phoxinus phoxinus) populations in a lowland river (river endrick) and a highland loch (loch maragan) in central scotland. prevalence of the parasite approached 100% in all samples taken from both populations over a 12-month period, and within each population the intensity of infection increased with increasing host fork length. however, the tw ... | 1997 | 9705677 |
| ectoparasitic species of the genus trichodina (ciliophora: peritrichida) parasitising british freshwater fish. | seven species of the genus trichodina ehrenberg, 1838 were identified during a sampling programme of twenty freshwater fish species from approximately sixty sites in scotland, england and wales. species found include: trichodina acuta lom, 1961 from cyprinus carpio l., carassius auratus l., oncorhynchus mykiss (walbaum), salmo trutta l. and phoxinus phoxinus l.; trichodina domerguei wallengren, 1897 from gasterosteus aculeatus l.; trichodina tenuidens faure-fremiet, 1944 from gasterosteus aculea ... | 1998 | 9805782 |
| brown trout and european minnow as target species for genotoxicity tests: differential sensitivity to heavy metals. | brown trout (salmo trutta) and european minnow (phoxinus phoxinus) were evaluated as target species to carry out genotoxicity tests. assessment was made of their relative abundance in wild; their distribution areas; and their sensitivity to heavy metals, intraperitoneally exposing individuals of both species to a low dose (1.7 mg/kg body weight) of different heavy metals. micronuclei were scored in renal erythrocytes 24 h after treatment. cadmium chloride significantly induced micronuclei in bot ... | 1999 | 10381308 |
| [the parasitic communities of the minnow (phoxinus phoxinus l>)]. | phoxinus phoxinus being a widely distributed through palaearctic and ecologically specialised species is a good model to study parasite communities. 72 specimens of p. phoxinus from 5 localities of the siberia and mongolia has been studied by the author and 651 specimens--from 5 localities in kola peninsula by the other researches. 595 specimens were studied by b. s. shulman (1983) year around. to describe infra- and component parasite communities the brillouin, shannon, berger-parker indexes we ... | 2000 | 10920840 |
| nestedness in assemblages of gyrodactylids (monogenea: gyrodactylidea) parasitising two species of cyprinid--with reference to generalists and specialists. | the structure of gyrodactylid assemblages in individual fishes of two species of cyprinid was determined. a total of 100 specimens of minnow, phoxinus phoxinus, and 137 specimens of roach, rutilus rutilus, were investigated for presence of gyrodactylids. host specificity, specialists vs. generalists, was noted in each host fish. a nested pattern was recorded in parasite assemblages of minnow, the host with a dominant number of specialist gyrodactylids. a non-nested pattern was observed in parasi ... | 2000 | 11027780 |
| rodlet cells and other inflammatory cells of phoxinus phoxinus infected with raphidascaris acus (nematoda). | rodlet cells (rcs), and other inflammatory cells, namely eosinophile granule cells (egcs), eosinophilic granulocytes and epithelioid cells in the liver, pancreas and peritoneal serosa of uninfected and naturally parasitized minnow phoxinus phoxinus (linnaeus, 1758), were studied by light and electron microscopy. forty-eight minnows were examined and in 18 fishes encysted larvae of the nematode raphidascaris acus (bloch, 1779) were encountered, mainly in the pancreas. the number of larvae in the ... | 2000 | 11129382 |
| [parasite communities and a fish spawn]. | high values of dominance index, low values of evenness and shannon index are characteristic of component parasite communities of prespawning (prosopium cylindraceum) and spawn migratory fishes (coregonus autumnalis, oncorhynchus nerka). autogenic specialists are dominant in the component parasite communities of c. autumnalis. the component parasite communities of p. cylindraceum and o. nerka are dominant in a content of generalist species. the o. nerka parasite communities are communities "sente ... | 2002 | 11962200 |
| 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, ... | 2003 | 12733793 |
| the crossroads of molecular, typological and biological species concepts: two new species of gyrodactylus nordmann, 1832 (monogenea: gyrodactylidae). | nucleotide sequences of nuclear ribosomal dna internal transcribed spacers (its) were used to confirm morphological identification of gyrodactylus species in fennoscandia. three pairs of morphologically similar or cryptic species are compared in this study. g. branchicus malmberg, 1964 and g. rarus wegener, 1910, hosted by the sticklebacks gasterosteus aculeatus l. and pungitius pungitius (l.), respectively, displayed a genetic divergence of 0.9-1.3% along 774 nucleotides of its (jukes & cantor ... | 2003 | 12815215 |
| the life cycle and seasonal changes in the occurrence of pomphorhynchus laevis (palaeacanthocephala, pomphorhynchidae) in a small isolated lake. | in a small isolated lake in slovakia, the fish acanthocephalan pomphorhynchus laevis using gammarus balcanicus and the minnow phoxinus phoxinus, respectively, as its intermediate and final hosts, represented a dominant helminth species. its prevalence and intensity of infection in fish showed no significant variation during a year fluctuating above the mean values of 89% and 6.6 worms per fish. the mean prevalence of p. laevis larvae in gammarus was 41.4% with a maximum in the late summer and au ... | 2003 | 14535165 |
| its rdna sequences of pomphorhynchus laevis (zoega in müller, 1776) and p. lucyi williams and rogers, 1984 (acanthocephala: palaeacanthocephala). | the internal transcribed spacers (its-1 and its-2) of the ribosomal rna gene of pomphorhynchus laevis (zoega in müller, 1776) (acanthocephala) isolated from various fish species across central and southern europe were compared with those of p. lucyi williams and rogers, 1984 collected from the largemouth bass micropterus salmonoides boulenger from the usa. the nucleotide sequences of its regions of p. laevis from minnows phoxinus phoxinus (l.) and chub leuciscus cephalus (l.) from two distant lo ... | 2003 | 14574091 |
| micronucleus test in freshwater fish species: an evaluation of its sensitivity for application in field surveys. | brown trout, salmo trutta, european eel, anguilla anguilla, and european minnow, phoxinus phoxinus, three fish species inhabiting european freshwater ecosystems, were evaluated for their use as in situ pollution biomarkers using the micronucleus test in renal erythrocytes. experimental exposure (by immersion) to different concentrations of cyclophosphamide, colchicine, and cadmium showed that brown trout are more sensitive to the three compounds than minnows and eels. in situ surveys of wild fre ... | 2003 | 14575685 |
| the response of stream-dwelling fish to liming. | the fish fauna in 22 limed and seven unlimed small streams was monitored using yearly electrofishing to assess the effects of liming on species occurrence and abundance. the liming techniques were divided into three main methods, lake liming, doser liming and wetland liming, to evaluate whether different strategies had different effects on the fish fauna. the predominant species at the investigated stations were salmonids, mainly brown trout (salmo trutta) and atlantic salmon (salmo salar). othe ... | 1992 | 15091941 |
| toxicity of acid aluminium-rich water to seven freshwater fish species: a comparative laboratory study. | the present study focuses on the relative sensitivity among freshwater fish species to aqueous aluminium. seven common scandinavian fish species were exposed to acidic al-rich water, acidic al-poor water, and approximately neutral water as a control. the relative sensitivity among the species to an acute aluminium challenge was documented, and was in the following order: atlantic salmon, salmo salar, as the most sensitive; then roach, rutilus rutilus; minnow, phoxinus phoxinus; perch, perca fluv ... | 1997 | 15093412 |
| [seasonal dynamics of the component community structure of parasites of the minnow phoxinus phoxinus (l.)]. | the material represented by 75 specimens of minnow of the age 2-2(+) was collected according to the standard technique in the chovju river (tributary of the vychegda river, a region of the settlement nizniy chov, district of syktyvkar town) during the period june-september 2000. the quantitative estimation of the structure of the component parasite communities was performed by calculating errors of the equation of regression for each species group separately, with subsequent summarizing of means ... | 2004 | 15553771 |
| phylogenetic and taxonomic relationships of northern far eastern phoxinin minnows, phoxinus and rhynchocypris (pisces, cyprinidae), as inferred from allozyme and mitochondrial 16s rrna sequence analyses. | analyses of allozyme (18 loci) and partial mitochondrial dna (mtdna) sequences (1295 bp, 16s rrna) support the classification of phoxinin minnows from the northern far east into 2 genera of 8 species: phoxinus phoxinus, rhynchocypris oxycephalus, r. perenurus, r. czekanowskii, r. kumgangensis, r. semotilus, r. lagowskii and r. sp. (bergi ?). although r. lagowskii from japan and the amur basin and r. sp. from vladivostok region to korea have been classified into a single species by many authors a ... | 2006 | 16702765 |
| [the occurrence of tumors in the minnow phoxinus phoxinus (l.), their influence upon the parasite fauna, component community of parasites, and organism of the host]. | the occurrence of tumors, their influence upon the organism of phoxinus phoxinus (l.), its parasite fauna, and parasite component community were investigated in the upstream of the pechora river. according to the data obtained, tumors could occur in the fishes of every age group, but one-year (0+) or two-year (1+) old minnow is affected by tumors more frequently. the tumors lesion extensiveness ranges from 0.02 to 3 %. from 1 to 3 tumors were recorded on one fish specimen. the investigated tumor ... | 2006 | 16913295 |
| the role of rodlet cells in the inflammatory response in phoxinus phoxinus brains infected with diplostomum. | european minnows, phoxinus phoxinus l., are commonly infected with diplostomum phoxini faust, 1918 metacercariae. a sub-sample of 34 minnows collected from the river endrick, stirlingshire, scotland revealed that 50% of the population were infected (n = 17), with the cerebellum, medulla oblongata and the optic lobe regions of the minnow brain bearing the heaviest infections (13.7 +/- 2.6 mean +/- s.e.; 1-38 range). serial histological sections through the brains of both uninfected and infected m ... | 2007 | 17182257 |
| histopathological and ultrastructural observations of metacercarial infections of diplostomum phoxini (digenea) in the brain of minnows phoxinus phoxinus. | the spatial distribution and histopathological changes induced by metacercariae of the digenean trematode diplostomum phoxini (faust, 1918) in the brains of european minnows phoxinus phoxinus (l.) from the river endrick, scotland, were studied by light and electron microscopy. post-mortem examination of a sample of 34 minnows revealed that 50% (n = 17) of the population was infected with 13.7 +/- 2.6 (mean +/- se; range 1 to 38) metacercariae per infected host. serial histological sections of th ... | 2007 | 17523543 |
| [host age and structure of the component communities of parasites in river minnow phoxinus phoxinus (l.)]. | species composition and structure of the communities of fish parasites in river minnow phoxinus phoxinus (l.) from the pechora river were investigated in two of the pechora-ilychsky biosphere nature reserve, komi republic. the component communities of the parasites in river minnow are shown to have a one-year cycle including the states of development, completion, and destruction. communities in the state of development are characterized by a low variety of species, low values of shannon index, o ... | 2007 | 17957956 |
| 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 ... | 2008 | 18038199 |
| [component communities of parasites in the grayling thymallus thymallus (l.) (salmoniformes, thymallidae) and the minnow phoxinus phoxinus (l.) (cypriniformes, cyprinidae) from the pechora river]. | component communities of parasites of thymallus thymallus and phoxinus phoxinus are described. the communities differ in the number of species and in the number of dominate species, which is one in p. phoxinus and usually two in t. thymallus. in the first case the dominate species is allogenic, while in the second case dominate species are autogenic. values of the species diversity indexes are also different for these communities. the differences between parasite communities of t. thymallus and ... | 2007 | 18052005 |
| monogenean assemblages and the apparent transmission capability of monogeneans between related fish species: an experimental study. | gyrodactylid monogeneans are considered to be the most invasive fish parasites. they are omnipresent on teleost fishes and host change might play a crucial role in their biology. in the present study, related fish species were kept in single- or mixed-species groups to test the ability of gyrodactylus species to change their host fish under experimental conditions. the first group included two percid fish species, perch perca fluviatilis l. and ruffe gymnocephalus cernuus (l.), and the second gr ... | 2008 | 18288490 |
| genotoxic pressure of vineyard pesticides in fish: field and mesocosm surveys. | the present study deals with the genotoxicity assessment of vineyard pesticides in fish exposed in the field or in mesocosm conditions. primary dna damage was quantified as strand breaks using the single cell gel electrophoresis assay (comet assay) applied to fish erythrocytes. in a first experiment, a significant genotoxic effect was observed following an upstream-downstream gradient in early life stages of brown trout (salmo trutta fario) exposed in the morcille river contaminated by a mixture ... | 2008 | 18703238 |
| chromosome studies of european cyprinid fishes: interspecific homology of leuciscine cytotaxonomic marker-the largest subtelocentric chromosome pair as revealed by cross-species painting. | leuciscine cyprinids possess a nearly invariant diploid number (2n = 50) with an extremely uniform karyotype comprising of 8 pairs of metacentric, 13-15 pairs of submetacentric and 2-4 pairs of subtelocentric (st) to acrocentric (a) chromosomes. the largest pair is characteristically an st/a element-the 'leuciscine' cytotaxonomic marker. previously, the interspecific homology of this chromosome pair could not be assessed owing to the inability to produce euchromatic or serial banding patterns. i ... | 2008 | 18709543 |
| [component parasite communities in the minnow phoxinus phoxinus (l.) from ecologically safe and polluted reservoirs]. | a comparative analysis of the structure of component parasite communities in the minnow from ecologically safe or polluted to variable extent reservoirs was made. the analysis showed that the increase of the reservoir pollution by everyday drains, washings of fertilizers from the fields around and the dacha sections causes the change of dominant parasite species in the minnow, alteration of the sum of errors in the regression equation characterizing the spread of values of biomasses of the speci ... | 2008 | 18825919 |
| [application of the dynamic phase portrait method for the analysis of structural transformations in the component parasite communities of the minnow phoxinus phoxinus (l.)]. | the present study aimed to investigate structural changes in communities of fish parasites by the method of dynamic phase portrait. this method allows revealing equilibrium states of communities and analyzing a response of community near and far from these states. seasonal succession of the parasite communities in phoxinus phoxinus of different age from the rivers ulcheksha and chovju is considered as an example. the obtained phase portrait were found to reflect the seasonal succession of the pa ... | 2009 | 19370980 |
| [seasonal dynamics of the structure of component communities of parasites in the young minnow phoxinus phoxinus (l.)]. | component communities of parasites of phoxinus phoxinus from the chovju river near syktyvkar city (komi republic) are investigated in seasonal aspect. material for the study has been collected in may-september 2000 from 90 host specimens of ages 0+-1+. calculations of diversity indices and other coefficients have been made by two ways -- for metazoan parasites only and for whole parasite community including protozoan species. in both these cases three states of the community have been establishe ... | 2009 | 19505016 |
| [structure of component parasite communities in the grayling, thymallus thymallus l. (salmoniformes, thymallidae), and minnow, phoxinus phoxinus l. (cypriniformes, cyprinidae), from the upper reaches of the pechora river]. | a comparative analysis of parasite communities in the grayling and minnow has been performed. these communities differ in the number of constituent species and in that the community of the minnow is dominated by one allogenic species, whereas that of the grayling usually has two dominants, both being autogenic species. the values of species diversity indices characterizing these communities are also different. differences between the parasite communities of these fish species reflect the positio ... | 2009 | 19548620 |
| 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 ... | 2009 | 19827362 |
| experimental transmission of malacosporean parasites from bryozoans to common carp ( cyprinus carpio) and minnow ( phoxinus phoxinus). | to address whether a fish host is involved in the life cycles of malacosporeans of the genus buddenbrockia, cohabitation experiments with different bryozoan and fish species were conducted. samples were analysed by malacosporean-specific pcr, partial sequencing of the 18s rdna, and light and electron microscopy. co-habitation challenges with bryozoans resulted in malacosporean infections detected mainly in the kidney of common carp (cyprinus carpio) and minnow (phoxinus phoxinus). sequences of t ... | 2010 | 19849888 |
| [parasite fauna and features of the parasite community structure in the minnow phoxinus phoxinus (linnaeus) from yenisei and kacha rivers]. | phoxinus phoxinus is a species widely distributed throughout palaearctic and is a good model for investigation of parasite communities. species composition and structure of parasite communities in the minnow from the streams if different types, namely yenisei river near krasnoyarsk city and its left affluent kacha river, were examined. indices of shannon, simpson, and berger-parker were used to describe the component parasite communities. twenty five parasite species of seven classes were reveal ... | 2010 | 20349627 |
| forebrain structure in phoxinus phoxinus, a teleost of the cyprinid family. | | 2016 | 4791443 |
| [fauna and structure of parasite communities of the common minnow phoxinus phoxinus in the rivers of southern yakutia]. | in southern yakutia, the common minnow hosts 37 species of parasites, including the most numerous groups, such as infusoria, myxozoa, and monogenea. specific parasites include myxobolus lomi, myxobolus mongolicus, epistylus phoxini, apiosoma phoxini, trichodina mira, paratrichodina phoxini, gyrodactylus laevis, gyrodactylus limneus, gyrodactylus macronychus, gyrodactylus magnificus, and diplostomum phoxini. the component parasite communities are characterized by high rates of evenness and divers ... | 2015 | 26373189 |
| gyrodactylus laevisoides n. sp. (monogenea: gyrodactylidae) infecting northern redbelly dace phoxinus eos cope (cyprinidae) from nova scotia, canada. | gyrodactylus laevisoides n. sp. is described from the gill rakers of red belly dace, phoxinus eos cope (cyprinidae), from nova scotia, canada. gyrodactylus laevisoides n. sp. is the second species of gyrodactylus nordmann, 1832 described from this host and is characterised by weakly curving hamuli, a small ventral bar lacking anterolateral processes, stout dorsal bar, small marginal hooks with sickles larger proximally than distally and having a small circular process on the heel, a mco with spi ... | 2013 | 24163028 |
| ancient and modern genome shuffling: reticulate mito-nuclear phylogeny of four related allopatric species of gyrodactylus von nordmann, 1832 (monogenea: gyrodactylidae), ectoparasites on the eurasian minnow phoxinus phoxinus (l.) (cyprinidae). | phylogenetic analyses including four allopatric species of gyrodactylus von nordmann, 1832 on the eurasian minnow phoxinus phoxinus (l.) (cyprinidae) revealed incongruence between the nuclear its1-5.8s-its2 and mitochondrial cox1 phylogenies due to ancient hybridisation. gyrodactylus pannonicus molnár, 1968 was sampled close to its type-locality, the upper reaches of river tisza, tributary of danube in the black sea basin. faunistic search detected three new related species with maximum composit ... | 2017 | 28130668 |
| fine structure and cellular responses at the host-parasite interface in a range of fish-helminth systems. | a series of ultrastructural-based studies were conducted on the interface region in different fish-helminth systems: (a) an intestinal infection of the cestode monobothrium wageneri in tench, tinca tinca; (b) an extensive intestinal submucosa and mucosal infection in tench by metacercariae of an unidentified digenean trematode; (c) an intestinal infection in brown trout, salmo trutta, by the acanthocephalan dentitruncus truttae; (d) an extraintestinal infection by larvae of the acanthocephalan, ... | 2015 | 25613477 |
| a fine structural review on the spermatozoa of cyprinidae with attention to their phylogenetic implications. | the fine structural organization and dimensions of spermatozoa from species of 4 subfamilies of the cyprinidae (barbus barbus, carassius carassius, cyprinus carpio carpio, cyprinus carpio haematopterus, abramis brama, alburnoides bipunctatus, alburnus alburnus, chalcalburnus chalcoides mento, chondrostoma nasus, hypophthalmichthys molitrix, leuciscus cephalus, phoxinus phoxinus, rutilus rutilus, rutilus meidingerii, scardinius erythrophthalmus, vimba vimba and ctenopharyngodon idella) are compar ... | 2009 | 19688692 |
| the biotransformation of [14c]phenol in some freshwater fish. | 1. the biotransformation of phenol was investigated in eight species of freshwater fish: bream (abramis brama), goldfish (carassius auratus), guppy (poecilia reticulata), minnow (phoxinus phoxinus), perch (perca fluviatilis), roach (rutilus rutilus), rudd (scardinius erythropthalmus) and tench (tinca tinca), when exposed to sublethal concentrations of phenol in the aquarium water. 2. the two conjugates, phenyl sulphate and phenyl glucuronide, were the sole detected products produced by bream, pe ... | 1981 | 7293212 |
| the life cycle of paraquimperia tenerrima: a parasite of the european eel anguilla anguilla. | previous studies on the life history of the nematode eel specialist paraquimperia tenerrima (nematoda: quimperiidae) have failed to determine whether an intermediate host is required in the life cycle. in the laboratory, eggs failed to hatch below 10 degrees c, hatching occurring only at temperatures between 11 and 30 degrees c. survival of the free-living second stage larvae (l2) was also temperature dependent, with maximal survival between 10 and 20 degrees c. total survival of the free-living ... | 2005 | 15946399 |
| habitat use by the fish assemblages of two chalk streams | patterns of habitat use by fish assemblages in two chalk streams in southern england were examined to identify species preferences with respect to major habitat gradients. both study sites, although differing in some physical habitat characteristics, mainly channel width, water temperature and instream cover, could be arranged similarly along a continuum extending from erosional to depositional habitats. twelve fish species were collected from stream surveys conducted during july 1993. the habit ... | 1997 | 9236089 |
| csf-contacting and other somatostatin-immunoreactive neurons in the brains of anguilla anguilla, phoxinus phoxinus, and salmo gairdneri (teleostei). | a system of somatostatin-immunoreactive neurons was demonstrated in the brains of the eel, anguilla anguilla, the european minnow, phoxinus phoxinus, and the rainbow trout, salmo gairdneri, by means of the light-microscopic indirect immunoperoxidase technique. in the anterior periventricular nucleus, somatostatin-immunoreactive cerebrospinal fluid (csf)-contacting neurons display intensely stained intraventricular dendritic protrusions, perikarya, and axonal processes. the latter taper into a so ... | 1983 | 6137283 |
| molecular diversity of germany's freshwater fishes and lampreys assessed by dna barcoding. | this study represents the first comprehensive molecular assessment of freshwater fishes and lampreys from germany. we analysed coi sequences for almost 80% of the species mentioned in the current german red list. in total, 1056 dna barcodes belonging to 92 species from all major drainages were used to (i) build a reliable dna barcode reference library, (ii) test for phylogeographic patterns, (iii) check for the presence of barcode gaps between species and (iv) evaluate the performance of the bar ... | 2015 | 25186809 |
| [electron microscopical and autoradiographical studies on the so-called yolk-nuclei in the oocytes of nemacheilus barbatulus (l.) and phoxinus phoxinus (l.) (pisces, teleostei) (author's transl)]. | the yolk-nuclei in the oocytes of the teleosts noemacheilus barbatulus (l.) and phoxinus phoxinus (l.) were investigated by electron microscopy, autoradiography and ultrahistochemistry. yolk-nuclei were only found in stage i. they consist of mitochondria, an osmiophilic material and in noemacheilus partly of dictyosomes. it was demonstrated by marking with [3h]-uridine, that the osmiophilic material contains rna. the osmiophilic material gets into the juxtanuclear cytoplasm. there it is surround ... | 1978 | 689247 |
| ultrastructural comparative investigations on the hypophysary cells in fresh-water teleosts under natural conditions. the glycoproteic thyreotrope cells. | the structural und ultrastructural characteristics of the glycoproteic hypophysary cells - considered as tsh producers - were studied with optical and electron microscopical means in 7 species of freshwater teleosts: leuciscus cephalus l., barbus meridionalis petényi h., chondrostoma nasus l., gobio gobio carpathicus vlad., phoxinus phoxinus l., nemachylus barbatulus l. and cobitis taenia l., during the reproductive period and in the period of sexual rest. these cells are present in a relatively ... | 1983 | 6649780 |
| [analysis of parasitic communities in fishes from lake baikal]. | analysis of infracommunities and component communities of fish parasites in lake baikal has been conducted for the first time. it has been revealed that parasite infracommunities for the majority of baikal fishes are weakly balanced and impoverished (the berger-parker index is > 0.5; evension is < 0.5; the brillouin index is < 1). the highest diversity and balance of the communities are characteristic for carnivorous fishes (brachymystax lenok, hucho taimen, thymallus arcticus, esox lucius, and ... | 2007 | 16755724 |
| [chemical danger signal in the "predator-prey" system in fishes]. | studies have been made on peculiarities of defensive reaction in phoxinus phoxinus to external metabolites produced by the pike esox lucius and excreted into the basin. it was shown that the skin and mucose of the pike contain low molecular weight substances (m. w. about 1300) which being introduced into the basin serve as a chemical signal of danger to phoxinus phoxinus. | 2006 | 676587 |
| [2 new species of parasites of fish, myxobilatus schulmani sp. n. and apiosoma longiciliaris sp. n. of the water reservoirs of the kol'sk peninsula]. | two new species of parasitic protozoa are described, one of myxosporidia and the other of peritricha sessilia. myxobilatus schulmani sp. n. from pungitius pungitius is near to m. paragasterostei but differs from it by the rhombus form of the spore, by less dimension of polar capsules. the spore of m. shulmani is longer and less broader than that of m. paragasterostei. apiosoma longiciliaris sp. n. was found on the gills on esox lucius and phoxinus phoxinus. it is near to a. dallii but its micron ... | 2009 | 1187178 |
| increased noise levels have different impacts on the anti-predator behaviour of two sympatric fish species. | animals must avoid predation to survive and reproduce, and there is increasing evidence that man-made (anthropogenic) factors can influence predator-prey relationships. anthropogenic noise has been shown to have a variety of effects on many species, but work investigating the impact on anti-predator behaviour is rare. in this laboratory study, we examined how additional noise (playback of field recordings of a ship passing through a harbour), compared with control conditions (playback of recordi ... | 2014 | 25058618 |
| behavioural thermoregulation in two freshwater fish species. | in the presence of a vertical thermal gradient, juvenile three-spined sticklebacks gasterosteus aculeatus and minnows phoxinus phoxinus positioned themselves higher in the water column compared with adult conspecifics. this result was consistent regardless of whether age cohorts were tested separately or together. furthermore, juveniles but not adult fishes positioned themselves higher in water column in the presence of a thermal gradient compared with those in the absence of a thermal gradient. ... | 2010 | 20557593 |
| molecular data suggest a multispecies complex of phoxinus (cyprinidae) in the western balkan peninsula. | this study aimed to evaluate the phylogeographic distribution of phoxinus phoxinus sensu lato populations in the balkan peninsula using molecular methods. for the western balkan peninsula, two species (danubian p. phoxinus and adriatic p. lumaireul) have been suggested, but not confirmed by subsequent morphological studies or by genetic data. for the present study, more than 300 specimens were collected from the western balkans. a partial sequence of the mt cyt b gene analysed using bayesian and ... | 2015 | 26143109 |
| southern mexican minnows of the genus notropis (actinopterygii, cyprinidae): genetic variation, phylogenetic relationships and biogeographical implications. | allozyme analyses were performed to determine patterns of genetic variation and phylogenetic relationships within the genus notropis in southern mexico. products of 28 gene loci were resolved in 24 geographic samples belonging to four putative species. these species represent the southern limit of the cyprinidae in north america. five loci were found monomorphic and 11 were diagnostic among species when the outgroup, phoxinus phoxinus, was not taken into account. four groups were identified, but ... | 2001 | 11182485 |
| the lateral line receptor array of cyprinids from different habitats. | the lateral line system of teleost fishes consists of an array of superficial and canal neuromasts (cn). number and distribution of neuromasts and the morphology of the lateral line canals vary across species. we investigated the morphology of the lateral line system in four diurnal european cyprinids, the limnophilic bitterling (rhodeus sericeus), the indifferent gudgeon (gobio gobio), and ide (leuciscus idus), and the rheophilic minnow (phoxinus phoxinus). all fish had lateral line canals on h ... | 2014 | 24142903 |
| the demographic history of populations experiencing asymmetric gene flow: combining simulated and empirical data. | population structure can significantly affect genetic-based demographic inferences, generating spurious bottleneck-like signals. previous studies have typically assumed island or stepping-stone models, which are characterized by symmetric gene flow. however, many organisms are characterized by asymmetric gene flow. here, we combined simulated and empirical data to test whether asymmetric gene flow affects the inference of past demographic changes. through the analysis of simulated genetic data w ... | 2013 | 23718226 |
| species-specific responses to landscape fragmentation: implications for management strategies. | habitat fragmentation affects the integrity of many species, but little is known about species-specific sensitivity to fragmentation. here, we compared the genetic structure of four freshwater fish species differing in their body size (leuciscus cephalus; leuciscus leuciscus; gobio gobio and phoxinus phoxinus) between a fragmented and a continuous landscape. we tested if, overall, fragmentation affected the genetic structure of these fish species, and if these species differed in their sensitivi ... | 2010 | 25567925 |
| evidence for the co-existence of separate strains or species of ligula in lough neagh, northern ireland. | ligula (cestoda: pseudophyllidea) infections in gudgeon (gobio gobio) and roach (rutilus rutilus) differ markedly in the pathology that is observed in the host, particularly with respect to a tissue response and the extent of inhibition of gonadal development. the entire internal transcribed spacer (its) region (its-1, 5.8s and its-2) and the large subunit domains d1-d3 were sequenced and compared in parasites from these fish from lough neagh, northern ireland, together with a single specimen fr ... | 2002 | 12015830 |