| inhibition of protein synthesis in vitro by a lectin from momordica charantia and by other haemagglutinins. | protein synthesis by a rabbit reticulocyte lysate is inhibited by the haemagglutinating lectins from momordica charantia and crotalaria juncea seeds and from the roe of rutilus rutilus, and by a commercial preparation of the mitogenic lectin from phytolacca americana. the haemagglutinins from the seeds of ricinus communis and of vicia cracca acquired inhibitory activity after their reduction with 2-mercaptoethanol. | 1979 | 508306 |
| non-repetitive dna sequence divergence in phylogenetically diploid and tetraploid teleostean species of the family cyprinidae and the order isospondyli. | non-repetitive dna of anciently tetraploid teleostean species was analysed for the presence of duplicated sequences. closely related diploid species were investigated in comparison. from the reassociation kinetics of total nuclear dna, rate constants and fraction sizes of classes of repetitive and non-repetitive sequences were determined. dna fractions enriched in the slowest renaturing sequence class were determined. dna fractions enriched in the slowest renaturing sequence class were prepared ... | 1979 | 533669 |
| additional precipitation reactions of lectins with human serum glycoproteins. | highly purified human serum glycoproteins were treated with neuraminidase and examined for their cross reaction with several lectins with anti-galactosyl specificity: beta-d-galactosyl structures are thought to be the main terminal sugar residues that become attached de novo after removal of neuraminic acid. the following lectins were tested: tridacnin from the bivalve clams tridacna maxima and tridacna gigas, the agglutinin from the sponge axinella polypoides, the lectin from the roach rutilus ... | 1978 | 564939 |
| dactylogyrids on the gills of roach in central finland: features of infection and species composition. | monogenean parasites were examined from the gills of 660 roach (rutilus rutilus) in four interconnected lakes in central finland between february and november 1986 and in three of the same lakes between february and december 1988. one of the lakes is eutrophic and polluted due to a paper and pulp mill, one is oligotrophic and in a natural state, and the other two lakes are eutrophic. the prevalence of dactylogyrus infection was always high. differences between the lakes and the years were observ ... | 1991 | 1743852 |
| parasitic protozoa of cyprinid fishes: protozoa of the roach rutilus rutilus (linnaeus, 1758) in czechoslovakia. | in the years 1985-1988, a total of 254 specimens of the roach, rutilus rutilus, captured in 23 localities of south bohemia, were examined for the presence of protozoan parasites. only 17 specimens (6.7%) were free of infection, whereas the others were infected at least with one parasite species, mixed infections were observed most frequently. the following species were found rarely: myxidium rhodei léger, 1905 in the liver and muscles. pleistophora mirandellae vaney et conte, 1901 in ovaries, tr ... | 1991 | 1916526 |
| a cortical lectin from the oocytes of rutilus rutilus stimulates mitogenic activity and release of soluble factors from human lymphocyte cultures and inhibits protein synthesis in a cell-free system. | 1. a cortical granule lectin was isolated from vitellogenic oocytes of a bony fish, the roach rutilus rutilus. 2. the lectin agglutinates human erythrocytes, is specific for l-rhamnose and is composed of different polypeptide subunits. 3. the lectin is the first lectin of animal origin that inhibits protein-synthesis by a rabbit reticulocyte lysate, and is also mitogenic for human lymphocytes. | 1991 | 2022291 |
| [the presence of enterovirus in species of shellfish and fish]. | enteroviruses were isolated from 12% of the digestive tract samples collected from anodonta cygnea (9.4%) and dreysena polymorpha (13.2%) shell species and from 8.4% of the branchiae sample from fish species rutilus rutilus, perca fluviatilis and silurus glanis. the isolated belonged to the following antigenic types: echo 2 and 7, coxsackie b 2, 4 and 6, and poliovirus 1 and 2. | 1990 | 2171625 |
| effects of chemical pollution on the activities of hepatic xenobiotic metabolizing enzymes in fish from the river rhône. | polychlorobiphenyl (pcbs) levels and hepatic xenobiotic metabolizing enzyme activities were measured in fish from three locations of the river rhône to study the consequences of a constant loading of pcbs from a pcb incineration plant. our results show that levels of pcbs and enzyme activities were higher in fish living downstream from the plant than in fish from two locations upstream, suggesting enzyme induction by pcbs (known to be potent inducers in laboratory conditions). enzyme activities ... | 1988 | 3145559 |
| [the occurrence of parasites in the bream (abramis brama l.), roach (rutilus rutilus l.) and perch (stizostedion lucioperca l.) in the włocławek dam reservoir on the vistula river]. | | 1988 | 3388868 |
| [on the demonstration of a new protectin anti-e streptoc. rut and of anti-g streptoc. sal in the roe of rutilus rutilus by streptococcus agglutination reactions]. | | 1968 | 4233171 |
| [temperature characteristics of tissue respiration in skeletal muscles of the roach rutilus rutilus lacustris and the albino rat]. | | 1972 | 4648001 |
| the effect of bacillus thuringiensis var. israelensis on toxorhynchites rutilus rutilus (diptera: culicidae) in the presence and absence of prey. | | 1982 | 6128423 |
| chemical dissection of stereovilli from fish inner ear reveals differences from intestinal microvilli. | a quick method was developed for isolating the stimulus-receiving apparatus (stereovilli = 'stereocilia') from the vestibular apparatus of fish (scardinius erythrophthalmus and rutilus rutilus) in sufficient quantity and purity to study the solubilities and stabilities of their structural elements by electron microscopy. the stereovilli were adsorbed to a support and, after various treatments, negatively stained or metal shadowed after freeze drying. for comparison, and in order to ensure the va ... | 1984 | 6512567 |
| 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 ... | 1994 | 7706678 |
| survey of the paratenic hosts of anguillicola crassus in lake velence, hungary. | anguillicola crassus infection of paratenic hosts was investigated in lake velence, hungary, in october 1992. a total of 155 specimens of 8 species (gymnocephalus cernuus, lepomis gibbosus, stizostedion lucioperca, abramis brama, alburnus alburnus, cyprinus carpio, pseudorasbora parva and rutilus rutilus) were examined: all species proved to be infected. there were large differences in the prevalence of infection among fishes, but the prevalence was generally higher in perciform fishes and it wa ... | 1994 | 7810405 |
| mosquito host range and specificity of edhazardia aedis (microspora: culicosporidae). | edhazardia aedis was transmitted horizontally to its natural host, aedes aegypti, and to 6 alternate hosts: ae. albopictus, ae. triseriatus, ae. taeniorhynchus, anopheles quadrimaculatus, orthopodomyia signifera and toxorhynchites rutilus rutilus. the microsporidium produced both binucleate and uninucleate spores in all susceptible hosts. transovarial transmission, however, was only successful in ae. aegypti. therefore, while e. aedis can infect a variety of mosquito species from diverse genera, ... | 1993 | 7902414 |
| occurrence and histological response of raphidascaris acus (nematoda: ascaridoidea) in roach from four lakes differing in water quality. | seasonality and size-related infection of raphidascaris acus larvae from the inner organs and intestine of roach (rutilus rutilus) were studied in 4 lakes of differing water quality and pollution level in central finland between august 1985 and november 1986. the influence of r. acus larvae on the liver and pancreatic tissues of roach was examined histologically in additional material from 1989 and 1990. the inner organs of roach were most heavily infected with r. acus in the eutrophic, polluted ... | 1994 | 8026896 |
| ligula intestinalis (l.) (cestoda: pseudophyllidea): polarization of cyprinid leucocytes as an indicator of host- and parasite-derived chemoattractants. | freshly isolated pronephric leucocytes from roach, rutilus rutilus and gudgeon, gobio gobio were exposed to extracts of plerocercoids of ligula intestinalis from these two cyprinid fish. addition of the extracts or an increase in incubation temperature from 10 to 20 degrees c induced polarization of neutrophils and l1 granulocytes. cells were transformed from their typical spherical shape to elongate forms possessing a ruffled leading edge. extracts obtained from gudgeon-ligula stimulated polari ... | 1993 | 8278223 |
| the capacity of liver microsomes to form benzo[a]pyrene-diolepoxide-dna adducts and induction of cytochrome p450 1a in feral fish exposed to pulp mill effluents. | an investigation was made of cytochrome p4501a (cyp1a) induction, determined by the activity of erod (7-ethoxyresorufin o-deethylase), and formation of benzo[a]pyrene-diolepoxide-dna (bpde-dna) adducts, measured by synchronous fluorescence spectrophotometry, in liver microsomes of perch (perca fluviatilis), bream (abramis brama), and roach (rutilus rutilus). fish were collected from the southern part of lake saimaa (finland), an area polluted by effluents from the pulp and paper industry. in add ... | 1996 | 8950535 |
| subchronic effects of pulp and paper mill effluents on the immunoglobulin synthesis of roach, rutilus rutilus. | roach (rutilus rutilus), from a unpolluted lake, were caged in a lake receiving treated waste waters from a pulp and paper mill 16 km upstream, and simultaneously a group of fish were held in cages in the unpolluted reference lake. the level of serum immunoglobulin of the fish kept in cages in these lakes was quantified. serum immunoglobulin levels decreased when the fish were transferred to the contaminated lake and remained significantly reduced for the 8-week period fish were monitored. in an ... | 1995 | 8964248 |
| a focus of opisthorchiidosis in germany. | epidemiological investigations were carried out in a focus of opisthorchiidosis in brandenburg state of germany. 9 out of 23 cats harboured adult flukes in their livers. beside opisthorchis felineus, metorchis bilis was found in 4 cats. muscle samples of 227 cyprinid fish belonging to 6 species (rutilus rutilus, scardinius erythrophthalmus, alburnus alburnus, abramis brama, a. ballerus, blicca bjoerkna) were examined for trematode metacercariae. 12 different types of cysts were found. o. felineu ... | 1996 | 9060173 |
| isolation and characterisation of mrna encoding the salmon- and chicken-ii type gonadotrophin-releasing hormones in the teleost fish rutilus rutilus (cyprinidae). | the complementary dnas (cdna) encoding the [trp7,leu8]-gonadotrophin-releasing hormone (salmon-type gnrh; sgnrh:genebank accession no. u60667) and the [his5,trp7,tyr8]-gnrh (chicken-ii-type gnrh; cgnrh-ii: genebank accession no. u60668) precursor in the roach (rutilus rutilus) were isolated and sequenced following reverse transcription and rapid amplification of cdna ends (race). the sgnrh and cgnrh-ii precursor cdnas consisted of 439 and 628 bp, and included open reading frames of 282 and 255 b ... | 1997 | 9460654 |
| immunoreactivity of roach, rutilus rutilus, following laboratory exposure to bleached pulp and paper mill effluents. | in order to study immunomodulation, controlled laboratory experiments were carried out with roach (rutilus rutilus) exposed to bleached kraft mill effluent (bkme) or spent bleach liquor (sbl) from two pulp and paper mills using elementary chlorine and chlorine dioxide for bleaching. the total number of immunoglobulin-secreting cells (isc) and the number of specific antibody-secreting cells (asc) were determined by elispot assay. exposure to bkme resulted in decreased numbers of isc in the spleen ... | 1997 | 9469879 |
| 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 ... | 1998 | 9652133 |
| development of monogenean communities on the gills of roach fry (rutilus rutilus). | the formation and development of monogenean communities on the gills of roach fry was followed in 1992 from early june to october (size range 9 to 47 mm). roach fry (n = 291) were sampled weekly from the small, humic river rutajoki in central finland. a further 209 roach fry were reared in a fish farm supplied by water from the river. four dactylogyrus species were found: d. nanus, d. crucifer, d. micracanthus and d. suecicus. other species found on the gills were gyrodactylus sp. and paradiploz ... | 1999 | 10363281 |
| bioaccumulation of mercury in various fish species from orlík and kamýk water reservoirs in the czech republic. | the study evaluated contamination of fish by mercury in two important czech water reservoirs, orlík and kamýk, which receive water from the whole watershed of otava and vltava rivers. contamination of these reservoirs reflects the situation in southern and western bohemia. six environmentally representative sites were sampled in the area of interest and the evaluation was based on regression models relating hg concentrations in fish tissues to the age of fish. a total number of 170 analyzed indi ... | 1999 | 10381300 |
| pcb and pah impacts on cytochrome p-450-dependent oxidases in roach (rutilus rutilus) from the seine river (france). | roach were sampled in the seine river along a gradient of polyaromatic hydrocarbon (pah) concentrations at three stations: marnay upstream of paris and epinay and poses downstream of paris. two hepatic monooxygenase activities: erod (ethoxyresorufine-o-deethylase) and ae (aldrin epoxydase) and muscle residues of pcbs and pahs were investigated during three periods of the year (before spawning, during spawning, and postspawning). before spawning, erod and ae activities were significantly correlat ... | 1999 | 10398775 |
| gyrodactylus sommervillae n. sp. (monogenea) from abramis brama (l.) and rutilus rutilus (l.) (cyprinidae) in oxfordshire, uk. | gyrodactylus sommervillae n. sp. (monogenea) is described from the skin, fins and gills of abramis brama (l.) and rutilus rutilus (l.) from blenheim palace lake, oxfordshire, uk. g. sommervillae n. sp. closely resembles g. aphyae malmberg, 1957, g. kearni ergens, 1990 and g. lamberti ergens, 1990 in the approximate shape of the marginal hook sickle and the anchors, but can be separated on the precise shape of the marginal hooks and the ventral bar. | 1999 | 10613531 |
| experimental detection of the actinospores of myxobolus pseudodispar (myxosporea: myxobolidae) in oligochaete alternate hosts. | the development of myxobolus pseudodispar gorbunova, 1936, an intracellular myxosporean muscle parasite of the roach rutilus rutilus l., was studied in experimentally infected oligochaetes. in one experiment, uninfected tubifex tubifex müller and limnodrilus hoffmeisteri (claparéde) were exposed to mature spores of m. pseudodispar. triactinomyxon spores developed both in t. tubifex and l. hoffmeisteri specimens. triactinospores were first released from the oligochaetes 76 d after initial exposur ... | 1999 | 10686672 |
| interspecific comparison of cadmium and zinc contamination in the organs of four fish species along a polymetallic pollution gradient (lot river, france). | the impact of cadmium (cd) and zinc (zn) discharges related to an old zinc ore treatment facility in the lot river (france) was investigated in four fish species (the chub: leusciscus cephalus, the roach: rutilus rutilus, the perch: perca fluviatilis and the bream: abramis brama). the organisms were sampled in four stations along the polymetallic contamination gradient. cd and zn analysis were carried out in five organs (gills, posterior intestine, liver, kidneys and skeletal muscle) in order to ... | 2000 | 10807038 |
| co-existence of nine gill ectoparasites (dactylogyrus: monogenea) parasitising the roach (rutilus rutilus l.): history and present ecology. | co-existence among potentially competing species can be favoured by niche specialisation and/or by reducing the overall intensity of competition via aggregated utilisation of fragmented resources. we investigated the respective roles of niche specialisation and aggregation in the case of nine congeneric monogenean parasites on the gills of roach (rutilus rutilus l.) belonging to the genus dactylogyrus. the position of each individual parasite of the nine dactylogyrus species was recorded. niche ... | 2000 | 10996326 |
| effects of primary- and secondary-treated bleached kraft mill effluents on the immune system and physiological parameters of roach. | the present study was designed to examine, whether, effluents from a modern pulp and paper mill using elemental chlorine-free/total chlorine-free (ecf/tcf) bleaching, exert effects on the immune system of fish and, in addition, to relate these findings to physiological parameters known to be affected by bleached kraft-mill effluents (bkme). roach (rutilus rutilus) were exposed in laboratory conditions to primary- or secondary-treated effluent from a pulp and paper mill. in order to study their c ... | 2000 | 10998499 |
| 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 |
| ultraviolet b irradiation modulates the immune system of fish (rutilus rutilus, cyprinidae). part iii: lymphocytes. | the effects of short-term exposure to ultraviolet b (uvb) radiation on lymphocyte-related parameters were studied under controlled laboratory conditions using roach (rutilus rutilus), a cyprinid teleost, as the model fish. in vitro lymphoproliferative responses stimulated with a t-cell-specific mitogen, concanavalin a (cona), or a b-cell-specific activator, lipopolysaccharide (lps), were decreased in exposed fish. also nonstimulated proliferation was lower than in unexposed fish. cona-activated ... | 2001 | 11367572 |
| land use influence on 137cs levels in perch (perca fluviatilis l.) and roach (rutilus rutilus l.). | the environmental influence on chernobyl-derived 137cs levels in perch (perca fluviatilis l.) and roach (rutilus rutilus l.) was revealed using partial least-squares regression (pls). the 53 environmental predictors used describe land use in catchment areas, various catchment area and lake characteristics, lake water chemistry, and fish stock composition. the study showed a profound effect of land use on the 137cs levels in fish. radiocaesium deposited on arable land was retained in the soil to ... | 2001 | 11398373 |
| evidence for endocrine disruption in perch (perca fluviatilis) and roach (rutilus rutilus) in a remote swedish lake in the vicinity of a public refuse dump. | a two-year study on perch (perca fluviatilis) in lake molnbyggen, sweden, located in a pristine area but with a public refuse dump in the vicinity, has been conducted. the mechanistic approach through a set of biomarkers during the first year included age, condition, somatic growth, liver, gonad, and spleen weights, and a number of other physiological variables, in addition to ethoxyresorufin o-deethylase, glutathione-s-transferase, glutathione reductase, catalase, and the formation of dna adduc ... | 2001 | 11446832 |
| [molecular characterization of diplozoidae populations on 5 species of cyprinidae: new data on parasite specificity]. | the genus diplozoon (platyhelminth) exhibits one of the most striking modes of reproduction. adults reproduce after the permanent fusion of two larval hermaphrodites, which play a symmetrical role. the diplozoidae are also exceptional among the monogenea polyopisthocotylea for two other reasons. they represent the only group really diversified on continental freshwater fishes; however, this diversification is difficult to evaluate since few morphoanatomical criteria are available to distinguish ... | 2001 | 11510416 |
| long-term dynamics of ligula intestinalis and roach rutilus rutilus: a study of three epizootic cycles over thirty-one years. | data are presented on 2 full epizootic cycles and the start of a third of ligula intestinalis in roach rutilus rutilus in a small lake, and the relationships of these cycles to the densities of rudd, scardinius erythrophthalmus, and great crested grebes, podiceps cristatus, over 31 years. the parasite was introduced to the lake by p. cristatus in 1973 at a time when the roach population had increased in response to eutrophication to a level at which individual fish growth was stunted and the hit ... | 2001 | 11578089 |
| phenotypic modification of roach (rutilus rutilus l.) infected with ligula intestinalis l. (cestoda: pseudophyllidea). | in european freshwater, cyprinid fish may be heavily infected by plerocercoids of the pseudophyllidea cestode ligula intestinalis (l.). during their development, these parasites grow rapidly to a large size in the fish's body cavity, characteristically distending the abdomen. in this study, the influence of this tapeworm on roach (rutilus rutilus l.) morphology was analyzed. forty-five infected and 45 uninfected roach were collected from the lavernose-lacasse gravel pit in toulouse, south wester ... | 2001 | 11695356 |
| host manipulation by ligula intestinalis: accident or adaptation? | numerous studies have demonstrated that parasites with complex life-cycles can cause phenotypic modifications in their hosts that lead to an increased rate of transmission, and suggest that these modifications are the result of parasitic adaptations to manipulate the host. little attention is paid, however, to separating the possibility of adaptive host manipulation from incidental (if fortuitous) side-effects of infection. in this study we combine statistical and analytical tools to interpret t ... | 2001 | 11719963 |
| sexual disruption in a second species of wild cyprinid fish (the gudgeon, gobio gobio) in united kingdom freshwaters. | to establish whether the intersex condition seen in the roach (rutilus rutilus) in united kingdom (uk) rivers was species specific or a more general phenomenon in fish, evidence for sexual disruption was sought in a second cyprinid species, the gudgeon (gobio gobio). gudgeon were collected from the rivers aire and lea (at locations that receive high-volume discharges of sewage treatment works [stw] effluent and that contain intersex roach) and from two still waters, and their gonads were examine ... | 2001 | 11764169 |
| aggregation of congeneric parasites (monogenea: dactylogyrus) among gill microhabitats within one host species (rutilus rutilus l.). | parasite aggregation within the gill arches of 1 host species (rutilus rutilus l.) was studied in the case of 9 congeneric monogeneans belonging to the genus dactylogyrus. both intra- and interspecific aggregation were followed by considering gill arches as independent patches. parasite species were found to be aggregated both intra- and interspecifically. we showed that the intensity of parasite infection was positively related to intraspecific aggregation only for the more abundant species. no ... | 2001 | 11814047 |
| water temperature influencing dactylogyrid species communities in roach, rutilus rutilus, in the czech republic. | dactylogyrid species (monogenea) communities were studied in roach, rutilus rutilus, collected from two localities in the basin of morava river, czech republic, during the period from april to november 1997 and march to september 1998 to determine the effect of water temperature on parasite abundance, species richness and diversity. dactylogyrid species were found to co-occur on the gills of roach with up to six species found on the same host individual. nine dactylogyrid species were identified ... | 2001 | 11818057 |
| isolation and characterisation of rhabdovirus from wild common bream abramis brama, roach rutilus rutilus, farmed brown trout salmo trutta and rainbow trout oncorhynchus mykiss in northern ireland. | rhabdovirus was isolated from wild common bream abramis brama during a disease outbreak with high mortality in northern ireland during may 1998. rhabdovirus was also isolated at the same time from healthy farmed rainbow oncorhynchus mykiss and brown trout salmo trutta on the same stretch of river and 11 mo later from healthy wild bream and roach rutilus rutilus in the same river system. experimental intra-peritoneal infection of bream and mirror carp cyprinus carpio var specularis with 2 of thes ... | 2001 | 11843142 |
| host manipulation by ligula intestinalis: a cause or consequence of parasite aggregation? | previous investigations suggest that the infection of the cyprinid roach, rutilus rutilus, with the larval plerocercoid forms of the cestode, ligula intestinalis, creates behavioural and morphological changes in the fish host, potentially of adaptive significance to the parasite in promoting transmission to definitive avian hosts. here we consider whether these behavioural changes are important in shaping the distribution of parasite individuals across the fish population. an examination of fiel ... | 2002 | 12062552 |
| [repeated finding of the north american ciliate ambiphrya ameiuri (peritricha: scyphidae) in the rybinsk reservoir]. | the first case of a mass infection of fish fry with the ciliate ambiphrya ameiuri (thompson e. a., 1946) was found during the summer of 1989 in one of spawning zones of the rybinsk reservoir. in june-july of 2000 after the ten-year interval, the second case of infection with this parasite in the first-year roach rutilus rutilus has been observed. the prevalence of a. ameiuri was very low. nine other species of ciliates forming the ectoparasite community were also observed. parasites were dispose ... | 2002 | 12070965 |
| abundance-prevalence relationship of gill congeneric ectoparasites: testing the core satellite hypothesis and ecological specialisation. | we investigated the abundance-prevalence relationships in monogeneans belonging to the genus dactylogyrus. a total of 182 dactylogyrid populations representing nine species were collected from the gills of roach ( rutilus rutilus). local abundance was found to be strongly positively correlated with prevalence. two hypotheses were tested to explain this relationship: (1) the core-satellite hypothesis, and (2) the ecological specialisation hypothesis. abundance was log-normally distributed, and th ... | 2002 | 12107462 |
| the predictability of helminth community structure in space: a comparison of fish populations from adjacent lakes. | patterns in helminth community structure can suggest that various processes are acting to shape parasite communities into organised, non-random assemblages of species. it is not clear, however, whether a pattern observed in one host population at one time would be observed again at another time, or at the same time in a different but comparable host population. here, we test the repeatability of parasite community structure in space, and to a lesser extent time, with data on helminth parasites o ... | 2002 | 12204223 |
| occurrence of flavobacterium psychrophilum in fish-farming environments. | occurrence of flavobacterium psychrophilum in fish farms and fish-farming environments was studied using agar plate cultivation, the immunoflourescence antibody technique (ifat) and nested pcr. characteristics of 64 f. psychrophilum isolates from rainbow trout oncorhynchus mykiss, fish farm rearing water, ovarian fluid and wild fish were serotyped, ribotyped and compared biochemically. virulence of f. psychrophilum isolates from different sources was compared by injection into rainbow trout. add ... | 2002 | 12542087 |
| epizootic cutaneous papillomatosis in roach rutilus rutilus: sex and size dependence, seasonal occurrence and between-population differences. | epidemiology of epidermal papillomatosis in roach rutilus rutilus was studied in 11 roach populations in finland in 1999 and 2000 during the spawning period. in addition, the seasonal pattern of the disease was described in 1 population. papilloma tumours were observed on the skin and fins of roach in 8 populations out of 11. prevalence of papillomatosis varied from 0 to 62%, being higher in populations subject to industrial or sewage effluents. males and large fish had higher prevalence of papi ... | 2002 | 12553446 |
| parasite communities of freshwater fish under flood conditions. | the parasite communities of the freshwater fish species roach ( rutilus rutilus), bitterling ( rhodeus sericeus amarus) and perch ( perca fluviatilis) were investigated during a major flood. differences in parasite community structure due to changes in the host environment were expected. we therefore tested for differences in parasite species abundance and diversity as a consequence of the flood. potential changes in parasite community structure due to seasonal influences were also considered. w ... | 2003 | 12632164 |
| 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 |
| nuclearia pattersoni sp. n. (filosea), a new species of amphizoic amoeba isolated from gills of roach (rutilus rutilus), and its rickettsial endosymbiont. | a new species of amphizoic amoeba, nuclearia pattersoni sp. n., isolated from gills of rutilus rutilus l. is described. it is characterised by elongate flattened trophozoites of irregular shape. the longer dimension of their bodies is 13.2 (11.0-15.7) microm. filopodia radiating mostly from the poles are 2 to 2.5 times longer than the body. the diameter of less frequently observed spherical trophozoites is 8.2-10.8 microm; their filopodia radiate to all directions. cyst-like stages have shorter ... | 2003 | 14535340 |
| parasite communities as indicators of recovery from pollution: parasites of roach (rutilus rutilus) and perch (perca fuviatilis) in central finland. | we compared parasite communities in fish taken from a polluted lake (l. vatia) and two control lakes before (1986) and after (1995) nine years of markedly reduced chemical and nutrient loading from a pulpmill in central finland. discriminant analyses of the 1995 data, using a function based on the 1986 data, showed that the parasite communities in the fish from the two control lakes had changed relatively little, whereas those from l. vatia had converged on those from the mesotrophic control lak ... | 2003 | 14667171 |
| tuning host specificity during the ontogeny of a fish ectoparasite: behavioural responses to host-induced cues. | the choice between two alternative hosts, brown trout (salmo trutta) and roach (rutilus rutilus), and the response to visual and olfactory cues were studied in the ontogeny of argulus coregoni. the initial preference of the smallest parasites for brighter roach changed at the age of 2 weeks, at the size of about 2 mm, for trout, a typical salmonid host. younger argulids were attracted by a non-specific visual stimulus (white disc over dark background), and they did not respond to olfactory stimu ... | 2004 | 14712391 |
| effect of epidermal papillomatosis on survival of the freshwater fish rutilus rutilus. | epidermal papillomatosis occurs in several marine and freshwater fish species. previously, papillomatosis has been shown to induce mortality in juvenile carp. we studied the effect of epidermal papillomatosis on the survival of adult male roach rutilus rutilus by caging naturally diseased, marked (by us) fish in the field. within the constraints of the experimental design, there was no difference in survival between healthy, slightly diseased and heavily diseased fish. therefore, we conclude tha ... | 2003 | 14735936 |
| occurrence of methyl triclosan, a transformation product of the bactericide triclosan, in fish from various lakes in switzerland. | the bactericide triclosan and methyl triclosan, an environmental transformation product thereof, have been previously detected in lakes and a river in switzerland. both compounds are emitted via wastewater treatment plants (wwtps), with methyl triclosan probably being formed by biological methylation. passive sampling with semi-permeable membrane devices (spmds) showed the presence of methyl triclosan in some lakes, suggesting some potential for bioaccumulation of the compound. in this study, we ... | 2004 | 14750712 |
| myxobolus buckei sp. n. (myxozoa), a new pathogenic parasite from the spinal column of three cyprinid fishes from the united kingdom. | myxobolus buckei sp. n. is described from the spinal column of leuciscus cephalus (l.), rutilus rutilus (l.) and abramis brama (l.) from freshwater rivers in the north of england. the plasmodia develop within the remnants of the embryonic notochord in the intervertebral spaces. the spores are large, measuring (in microm) 14.0 +/- 0.7 x 11.5 +/- 0.6 (mean +/- sd), smooth, round to ellipsoid in valvular view with several sutural edge markings. the polar capsules are pyriform and of equal size, mea ... | 2003 | 14971593 |
| toxic effects of mining effluents on fish gills in a subarctic lake system in nw russia. | the mining company karelian pellet in northwestern russia extracts iron ore and processes it locally into pellets. the production operations affect the environment in the form of air pollution and wastewater emissions to lakes downstream from the factory. the toxic effects of the mining effluents on gills of perch (perca fluviatilis) and roach (rutilus rutilus) were studied. in lakes close to the factory, heavy metal concentrations in gills were not high, even though the metal content in sedimen ... | 2004 | 15041251 |
| [in process citation]. | an oecd study of contaminants in animals sampled from the wild is reviewed briefly. results are presented of analysis of residues of organochlorines of agricultural origin, and of pcbs, in samples of fish taken from the french zone of lac léman at thonon-les-bains. trends in organochlorine contamination in muscle of perca fluviatilis and rutilus rutilus are presented, for the years 1973 to 1981, and show low levels of the chemicals. all values found are lower than the maximum acceptable residue ... | 1987 | 15092795 |
| 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 |
| intraoligochaete development of myxobolus intimus (myxosporea: myxobolidae), a gill myxosporean of the roach (rutilus rutilus). | the infection with myxobolus intimus zaika, 1965 in the gills of the roach rutilus rutilus (l.) from lake balaton was recorded in 28 out of the 39 fish examined. developing and mature plasmodia were detected on the gills exclusively in the spring. the myxobolus intimus infection was found only in 2- to 3-year-old fish. in histological sections, young plasmodia were found in capillaries of the secondary lamellae. more mature, round plasmodia 0.4-0.6 mm in diameter, deformed the respiratory lamell ... | 2004 | 15357397 |
| epizootic cutaneous papillomatosis, cortisol and male ornamentation during and after breeding in the roach rutilus rutilus. | the prevalence of epidermal papillomatosis in roach is known to peak during the spawning period and to be higher in males than in females. the high occurrence of papillomatosis in polluted waters suggests that stress may contribute to the outbreak of the disease. however, little is known about breeding-induced stress in fish and its relationship with diseases. in this study, plasma cortisol concentration, hematocrit and the relative size of the spleen were determined in healthy and diseased male ... | 2004 | 15521317 |
| occurrence of some organic uv filters in wastewater, in surface waters, and in fish from swiss lakes. | organic uv filters are used in personal care products such as sunscreen products, and in cosmetics, beauty creams, skin lotions, lipsticks, hair sprays, hair dyes, shampoos, and so forth. the compounds enter the aquatic environmentfrom showering, wash-off, washing (laundering), and so forth via wastewater treatment plants (wwtps) ("indirect inputs") and from recreational activities such as swimming and bathing in lakes and rivers ("direct inputs"). in this study, we investigated the occurrence o ... | 2005 | 15773466 |
| concentration of selected metals in muscle of various fish species. | the purpose of this study was to assess concentration of selected metals (fe, mn, zn, cu, ni, co, cr, pb, cd, and hg) in the muscle of four common slovak fish species (chub--leuciscus cephalus, barbel--barbus barbus, roach--rutilus rutilus, and perch--perca fluviatilis). furthermore, correlations among the selected metals and order of metal accumulation in the fish muscle were determined. an electrofishing technique was used for collecting the fish from the nitra river (slovakia) in september 20 ... | 2005 | 15792307 |
| bioaccumulation of mercury in muscle tissue of fish in the elbe river (czech republic): multispecies monitoring study 1991-1996. | the study monitored mercury (hg) contamination of fish muscle tissue at 13 geographical sites that can be regarded as crucial points for an ecotoxicological assessment of the czech republic section of the elbe river. the descriptive part of the study was primarily aimed at comparative evaluation of the hg load during the period 1991-1996. the conclusions were supported by multivariate statistical analyses of the content of hg in the muscle tissue of 1251 fish belonging to 23 species with four do ... | 2005 | 15883097 |
| mixtures of estrogenic contaminants in bile of fish exposed to wastewater treatment works effluents. | most effluents from wastewater treatment works (wwtws) contain estrogenic chemicals that include steroidal estrogens and xenoestrogens. we investigated the nature of mixtures of estrogenic contaminants taken up by two species of fish exposed to two wwtws effluents. sexually immature rainbow trout, oncorhynchus mykiss, and sexually mature roach, rutilus rutilus, were exposed to tap water, river water, or one of two estrogenic wwtws effluents for up to 10 days, when the fish were sacrificed and ti ... | 2005 | 15884336 |
| parasite species coexistence and limiting similarity: a multiscale look at phylogenetic, functional and reproductive distances. | the factors that control biodiversity have been the focus of numerous recent investigations; these include species interactions, speciation, environmental gradients and heterogeneity, all of these operating differently at each observation scale. we used a null model to examine the influence of two forces shaping the community structure of dactylogyrus species parasitic on roach (rutilus rutilus) gills: interspecific competition that might prevent the coexistence of the most similar species and e ... | 2005 | 16049715 |
| intersex in wild roach (rutilus rutilus) from danish sewage effluent-receiving streams. | roach (rutilus rutilus) from danish streams that receive discharges of domestic sewage effluent were examined for the presence of alterations to gonadal development. in male roach, intersex was observed at a prevalence of 4.5-5% at reference sites and 6.7-6.5% at sewage effluent-impacted sites. a positive correlation was found between sewage effluent load and intersex frequency among male roach. the highest frequency of intersex (26.5%) was found in the stream kristrup landkanal, which had the h ... | 2006 | 16054215 |
| 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 ... | 2005 | 16117120 |
| the tapeworm ligula intestinalis (cestoda: pseudophyllidea) inhibits lh expression and puberty in its teleost host, rutilus rutilus. | the tapeworm ligula intestinalis occurs in the body cavity of its cyprinid second intermediate host, in this study the roach rutilus rutilus, and inhibits host gonadal development. the mechanism by which infected fish are prevented from reproducing is unknown. comparison of parameters, such as body length and weight, and condition factor and age, between infected and uninfected individuals, indicated only minor effects of parasitism on growth and condition. in contrast, seasonal gonadal developm ... | 2005 | 16322554 |
| factors affecting the intensity of epidermal papillomatosis in populations of roach, rutilus rutilus (l.), estimated as scale coverage. | studies of epidermal papillomatosis in fish populations have only rarely focused on the intensity of the disease, i.e. the number and size of papillomas. furthermore, the methods used to evaluate the intensity of papillomatosis have not been standardized. we tested the reliability of a method based on counting of scales covered by papilloma tumours in roach, rutilus rutilus (l). in addition, we studied the frequency distributions of the number of scales covered by papillomas within populations, ... | 2006 | 16436122 |
| occurrence of uv filters 4-methylbenzylidene camphor and octocrylene in fish from various swiss rivers with inputs from wastewater treatment plants. | uv filters are widely used compounds in many personal care products and cosmetics, such as sunscreens. after use, uv filters are washed off from skin and clothes and enter the aquatic environment. recent studies indicate that some lipophilic uv filters do accumulate in biota and act as endocrine disruptors. in this study, concentrations of 4-mbc (4-methylbenzylidene camphor) and oc (octocrylene), two widely used uv filters, were determined in the muscle tissue of fish (brown trout, salmo trutta ... | 2006 | 16568752 |
| morphological and genetic differences among actinosporean stages of fish-parasitic myxosporeans (myxozoa): difficulties of species identification. | the occurrence and morphology of actinosporean stages of myxosporeans were studied at a fish farm and in the river tisza in hungary. the 43 samples sequenced belonged to 10 'genotypes', from which six were determined as new actinosporean types. based on dna sequence analysis, the assumed actinosporean developmental stages of four myxozoan species were identified. the raabeia type collected from the worm branchiura sowerbyi was identified as myxobolus cultus yokoyama, ogawa & wakabyashi, 1995. th ... | 2006 | 16676228 |
| predicted exposures to steroid estrogens in u.k. rivers correlate with widespread sexual disruption in wild fish populations. | steroidal estrogens, originating principally from human excretion, are likely to play a major role in causing widespread endocrine disruption in wild populations of the roach (rutilus rutilus), a common cyprinid fish, in rivers contaminated by treated sewage effluents. given the extent of this problem, risk assessment models are needed to predict the location and severity of endocrine disruption in river catchments and to identify areas where regulation of sewage discharges to remove these conta ... | 2006 | 16818244 |
| 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 ... | 2002 | 16888943 |
| diversity of the parasite fauna of cyprinid (cyprinidae) and percid (percidae) fishes in the vistula lagoon, poland. | a total of 2398 fish specimens (1091 percidae and 1307 cyprinidae) belonging to 16 species (3 percidae and 13 cyprinidae), caught in the polish part of the vistula lagoon were examined within december 1994-march 1997. the parasites found were identified as belonging to 63 taxa (61 species as well as diplostomum spp. flukes and glochidia unionidae gen. sp. which could not be identified to species) of the microsporea (1), protozoa (1), myxozoa (2), monogenea (10), digenea (15), cestoda (11), nemat ... | 2003 | 16889022 |
| accumulation of some metals in muscles of five fish species from lower nitra river. | this paper reports the results of accumulated selected metals concentrations (fe, mn, zn, cu, ni, co, cr, pb, cd, hg and mehg) in the muscle of five common slovak fish species (chub-leuciscus cephalus, common carp-cyprinus carpio, prussian carp-carassius gibelio, roach-rutilus rutilus, and wels catfish-silurus glanis). furthermore, correlations among the selected metals and order of metal accumulation in the fish muscle were determined. the concentrations of metals (mg/kg wet weight basis) range ... | 2006 | 17000549 |
| association between environmental stress and epidermal papillomatosis of roach rutilus rutilus. | we studied the association between environmental stress and epidermal papillomatosis of roach rutilus rutilus l. in finnish waters using a 'matched pairs' design. populations impacted by industrial and/or sewage effluents were compared to reference populations from pristine sites. we examined both the prevalence (proportion of diseased fish) and intensity (number of scales covered by tumors) of the disease. results of generalized linear mixed models (glmm) indicated that the risk of papillomatos ... | 2006 | 17067068 |
| analysis of nodularin-r in eider (somateria mollissima), roach (rutilus rutilus l.), and flounder (platichthys flesus l.) liver and muscle samples from the western gulf of finland, northern baltic sea. | nodularin (nodln) is a cyanobacterial hepatotoxin that may cause toxic effects at very low exposure levels. the nodln-producing cyanobacterium nodularia spumigena forms massive blooms in the northern baltic sea, especially during the summer. we analyzed liver and muscle (edible meat) samples from common eider (somateria mollissima), roach (rutilus rutilus l.), and flounder (platichthys flesus l.) for nodln-r by liquid chromatography/mass spectrometry (lc-ms) and enzyme-linked immunosorbent assay ... | 2006 | 17089704 |
| trait-mediated indirect effects of predatory fish on microbial mineralization in aquatic sediments. | sediment-dwelling zoobenthos stimulate the mineralization of organic matter and alter nutrient cycling by aerating the sediment via burrows, by feeding on detritus, and by redistributing particles. here we experimentally revealed that abundant benthic chironomids (chironomus riparius) can perceive predatory fish (rutilus rutilus) via chemical cues (kairomones) and spend less time foraging at the sediment surface and more time hiding in their burrows. this predator avoidance behavior significantl ... | 2006 | 17249239 |
| parasite fauna of bream abramis brama and roach rutilus rutilus from a man-made waterway and a freshwater habitat in northern germany. | fifty specimens each of bream abramis brama and roach rutilus rutilus were examined for metazoan parasite fauna and trichodinid ciliates; 25 specimens of each species were collected from the kiel canal, a man-made waterway, and a nearby freshwater lake, the dieksee. this is the first detailed parasitological examination of a. brama and r. rutilus at these locations: 30 parasite species were found, comprising 4 protozoans, 4 myxozoans, 5 digeneans, 3 monogeneans, 2 cestodes, 6 nematodes, 2 acanth ... | 2007 | 17465307 |
| pcb levels and accumulation patterns in waterbird eggs and in their prey at lake kerkini, a north-eastern mediterranean wetland of international importance. | seven "target" pcb levels were determined and compared in waterbird eggs, in their prey, and in water at lake kerkini, northern greece, to investigate pcb bioaccumulation patterns and to define the best bioindicator of target pcbs for this area. pcbs were analysed from eggs of phalacrocorax carbo, podiceps cristatus, ardea cinerea, egretta garzetta, and nycticorax nycticorax and from prey types alburnus alburnus, rutilus rutilus, lepomis gibbosus. carassius auratus, and rana sp. pcbs analysed we ... | 2007 | 17549546 |
| the first record of aspidogaster limacoides diesing, 1834 (aspidogastridae: aspidogastrea) in poland. | aspidogaster limacoides diesing, 1834 was identified in two specimens of roach (rutilus rutilus l.) from middle odra river (lower silesia, sw poland). as the species is new to the polish parasitofauna, a description, measurements and figure are presented. | 2007 | 17912810 |
| the roach (rutilus rutilus) as a sentinel for assessing endocrine disruption. | alterations in development and reproduction as a consequence of exposure to endocrine-disrupting chemicals (edcs) have been demonstrated in many wildlife species. animals living in, or closely associated with, the aquatic environment are particularly vulnerable to endocrine disruption because thousands of chemicals are actively disposed into rivers, estuaries and seas. fish have thus been a focus in endocrine disruption studies, and some of the most comprehensive studies on the disruption of sex ... | 2007 | 17975536 |
| parasite community and mortality of overwintering young-of-the-year roach (rutilus rutilus). | the composition and development of the parasite community of overwintering young-of-the-year (yoy) roach (rutilus rutilus) was studied in outdoor artificial ponds. cumulative mortality of the roach from november until may was about 20%. the prevalences of the epizoic ciliates trichodina sp. and apiosoma sp., and of the monogeneans dactylogyrus suecicus, dactylogyrus nanus, and gyrodactylus sp. in general tended to peak in the beginning of april at a water temperature of about 8 c. however, mean ... | 2007 | 18163330 |
| 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 |
| 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 ... | 2008 | 18485450 |
| molecular and morphometric study of metacercariae and adults of pseudamphistomum truncatum (opisthorchiidae) from roach (rutilus rutilus) and wild american mink (mustela vison). | the presence of metacercariae and adults of the trematode pseudamphistomum truncatum in roach and mink, respectively, was recorded in lake fure north of copenhagen, denmark. this zoonotic digenean opisthorchiid represents a threat to humans due to its ability to infect the biliary system following ingestion of inadequately processed infected fish. therefore precise species identification of infective metacercariae in fish used for human consumption is essential. due to the relatively limited inf ... | 2008 | 18571328 |
| 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 |
| reproductive functions of wild fish as bioindicators of reproductive toxicants in the aquatic environment. | impacts on the reproductive health of wild fish are thought to be suitable early-warning tools indicating contamination of surface waters with endocrine-disrupting compounds. ecotoxicological assessment of these field observations depends on the availability of reliable biomarkers to enable a discrimination of natural variations of reproductive functions from anthropogenic impacts. | 2010 | 19373501 |
| host immunization shapes interspecific associations in trematode parasites. | 1. individuals of free-living organisms are commonly infected by multiple parasite species. under such circumstances, positive or negative associations between the species are possible because of direct or indirect interactions, details in parasite transmission ecology and host-mediated factors. one possible mechanism underlying these processes is host immunity, but its role in shaping these associations has rarely been tackled experimentally. 2. in this study, we tested the effect of host immun ... | 2009 | 19457020 |
| expression of gonadotropin subunits in roach (rutilus rutilus, cyprinidae) infected with plerocercoids of the tapeworm ligula intestinalis (cestoda). | plerocercoids of the tapeworm ligula intestinalis (cestoda: bothriocephalidea) have been reported to inhibit gametogenesis of their intermediate fish hosts. however, mechanistic studies are rare and the proximate cues leading to impaired reproduction still remain unknown. in the present study we investigated the effects of infection by l. intestinalis on reproductive parameters of roach (rutilus rutilus, cyprinidae), a common fish host of this parasite. field studies on roach demonstrated that i ... | 2009 | 19477180 |
| naturally-induced endocrine disruption by the parasite ligula intestinalis (cestoda) in roach (rutilus rutilus). | fish represent the most frequently used vertebrate class for the investigation of endocrine disruption (ed) in wildlife. however, field studies are complicated by exposure scenarios involving a variety of anthropogenic and natural influences interfering with the endocrine system. one natural aspect rarely considered in ecotoxicological studies is how parasites modulate host physiology. therefore, investigations were carried out to characterise the impacts of the parasitic tapeworm ligula intesti ... | 2010 | 19723526 |
| endocrine effects of the tapeworm ligula intestinalis in its teleost host, the roach ( rutilus rutilus). | the effects of parasite infection by the cestode ligula intestinalis on the reproductive function and endocrine system of wild roach rutilus rutilus were evaluated. gonad maturation, plasma vitellogenin, plasma steroid concentrations (i.e. progesterone, 11-keto-testosterone and 17-beta-estradiol) and brain aromatase activity were investigated in relation with parasitization. a low prevalence (8%) of ligulosed roach and a moderate impact of parasitization (mean parasitization index of 8.8%) were ... | 2010 | 19961656 |
| 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 ... | 2010 | 20127367 |
| [metazoan parasites of roach rutilus rutilus (l., 1758), bream abramis brama (l., 1758) and perch perca fluviatilis l., 1758 from lakes of river łyna watershed]. | during the years 2004-2006 the parasitological autopsies of three species of fish: roach rutilus rutilus (l.), bream abramis brama (l.) and perch perca fluviatilis l. from three lakes situated in warmińsko-mazurskie voivodeship were done. the aim of this study was comparable analysis of metazoan parasite communities which occur in roach, bream and perch in three lakes of river łyna watershed. these lakes differ by physical (size, depth, eutrophication degree) and biological factors (composition ... | 2010 | 20450014 |
| environmental factors regulate the effects of roach rutilus rutilus and pike esox lucius on perch perca fluviatilis populations in small boreal forest lakes. | in 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 ... | 2010 | 20537014 |
| biliary parasite pseudamphistomum truncatum (opistorchiidae) in american mink (mustela vison) and eurasian otter (lutra lutra) in ireland. | native eurasian otter (lutra lutra) and introduced american mink (mustela vison) carcasses collected throughout ireland were screened for biliary parasites. secondary intermediate hosts, cyprinid fish, were also examined for opistorchiid metacercariae. twenty-nine mink and 24 otter gall bladders were screened for biliary parasites. a single mink and three otters were found to be infected with the digenetic trematode pseudamphistomum truncatum. eighty-nine percent of roach (rutilus rutilus) from ... | 2010 | 20582437 |
| diet shifts and food selection of perch perca fluviatilis and roach rutilus rutilus in humic lakes of varying water colour. | the field data from four humic lakes suggested that water colour may have both direct and indirect effects on inter- and intra-specific interactions of perch perca fluviatilis and roach rutilus rutilus. the results agree with suggestions that, compared with r. rutilus, p. fluviatilis may be an inferior forager on zooplankton in highly coloured water. as an indirect effect, water colour decreases the coverage of macrophytes and limits suitable littoral habitats, benefiting r. rutilus over p. fluv ... | 2010 | 20646150 |