| localization of alkaline and acid phosphatase activity in the intestine of healthy breams (abramis brama l.) and those infected with plerocercoid of tapeworm ligula intestinalis (linné 1758). | the examination included 40 breams 4 to 7 years old (18 infected and 22 uninfected). alkaline and acid phosphatase activity, as shown by the azo-coupling method, has been localized in the oesophagus and the intestine, being the strongest in the epithelium. it was distinctly less intensive in the lamina propria mucosae and in the intermuscular connective tissue of the oesophagus, in the submucosa, in the cells of auerbach plexus and in the blood vessel walls. besides only the acid phosphatase act ... | 1977 | 409038 |
| an indication of change in ligula intestinalis (linn.) occurrence in spottail shiners, notropis hudsonius (clinton), from western lake erie, 1929-1977. | | 1979 | 540285 |
| calcification in an ageing ligula intestinalis (l) plerocercoid from a bream (abramis brama l.). | light and transmission electron microscopy of the strobila of a large old ligula intestinalis plerocercoid has revealed microcrystals with a morphology similar to that of microapatite crystals from vertebrates. analysis of the microcrystals with emma-4 showed them to contain calcium and phosphorus. the tissue in the immediate vicinity of the microcrystals shows signs of necrosis while further away it is histologically normal. | 1977 | 919699 |
| effect of the cestode ligula intestinalis on spottail shiners, notropis hudsonius. | | 1976 | 1000429 |
| tricarboxylic acid cycle enzymes in the plerocercoid of ligula intestinalis (cestoda: pseudophyllidea). | all enzymes of the tricarboxylic acid cycle are present in subcellular fractions of the plerocercoid of ligula intestinalis but the low activity of aconitase and malate dehydrogenase in the forward direction suggests that the complete cycle may be of questionable importance to the parasite. as in other helminths and intertidal molluscs, succinate, formed via a partial reversal of the tricarboxylic acid cycle, is a major end-product of anaerobic glucose degradation. | 1975 | 1114868 |
| [alkaline and acid phosphatases and hemosiderin in the internal organs of bream (abramis brama l.) infected with plerocercoid ligula intestinalis (linne, 1758)]. | | 1975 | 1146335 |
| on some cestodes parasitizing freshwater fish in italy. | the paper presents a systematic survey of some cestodes parasitizing freshwater fish in italy. the following eight species were recorded: monobothrium wageneri, cyathocephalus truncatus, triaenophorus nodulosus (plerocercoids and adults), bothriocephalus acheilognathi, b. claviceps, ligula intestinalis (plerocercoids), schistocephalus sp. (plerocercoids) and proteocephalus percae from perca fluviatilis which is reported from freshwater fish in italy for the first time. all the tapeworms recovere ... | 1992 | 1339972 |
| a double surface membrane in plerocercoids of ligula intestinalis (cestoda: pseudophyllidea). | the tegument of ligula intestinalis plerocercoids is delimited by a membrane complex that in electron microscopy appears heptalaminate. we suggest that the plerocercoids are covered by two closely apposed lipid bilayers. double membranes, which are well known in schistosomes, are thus not a unique feature of blood parasitic digenea but could be documented for the first time in a cestode species that lives in the peritoneal cavity of its host. the surface-membrane complex of plerocercoids was los ... | 1992 | 1557324 |
| parasitological serendipity: from schistocephalus to echinococcus. | attention is drawn to the situation nowadays, whereby workers are encouraged to undertake research which appears useful or of economic importance, although the history of science indicates that many major discoveries have been the result of 'serendipity'--'the chance observation falling on the receptive eye'. some of the more important examples in medicine and parasitology are reviewed. the author then relates how he was given a stickleback infected with the plerocercoid of schistocephalus solid ... | 1990 | 2210935 |
| changes in numbers and growth of ligula intestinalis in the spottail shiner (notropis hudsonius), and their roles in transmission. | eighteen species of fishes were collected during the open water (1985-1987) and winter seasons (1985-1986) from dauphin lake, manitoba, canada (51 degrees 17'n, 99 degrees 48'w) and examined for plerocercoids of ligula intestinalis (l.). plerocercoids were most prevalent (5.3%) in spottail shiners (notropis hudsonius), the major fish host for ligula in dauphin lake. detailed analysis of the spottail shiner-ligula host-parasite system revealed that the number of plerocercoids differed between yea ... | 1989 | 2760769 |
| [abnormal location of ligula intestinalis l. in scardinius erythrophthalmus l. from lake trasimeno]. | | 1986 | 2944464 |
| [the parasite fauna of east germany. 9. the helminth fauna of lutra lutra]. | alimentary tract, liver, kidneys and lungs of 25 otters, died of several causes during 1982-1987 in gdr were included in helminthological investigations. parasites were detected in 8 animals. one cestode: taenia martis and 3 trematodes: isthmiophora melis, opisthorchis felineus and pseudamphistomum truncatum are regarded to be certain parasites of this host. other findings like ligula intestinalis, azygia luccii and piscicola geometra and the fragment of a pseudophyllidean enter the alimentary t ... | 1988 | 3177936 |
| [the biochemical effects of plerocercoids of the tapeworm ligula intestinalis (l.) on the bream abramis brama (l.)]. | | 1988 | 3388862 |
| [parietal digestion of the plerocercoid of ligula intestinalis]. | | 1972 | 4668521 |
| the fine structure of the developing pseudophyllid tegument with reference to ligula intestinalis and schistocephalus solidus. | | 1967 | 5583392 |
| occurrence and pathology of ligula intestinalis infections in british fishes. | | 1968 | 5647108 |
| comparative fine structure of outer tegument of ligula intestinalis and schistocephalus solidus. | | 1968 | 5652495 |
| histochemical and biochemical studies on some enzymes of ligula intestinalis (cestoda:pseudophyllidea). | | 1966 | 5910461 |
| schistocephalus solidus and ligula intestinalis: pinocytosis by the tegument. | | 1981 | 6164566 |
| a novel phosphagen phosphotransferase in the plerocercoids of schistocephalus solidus (cestoda: pseudophyllidea). | neither phosphagens nor phosphagen phosphotransferase activity could be detected in fasciola hepatica, hymenolepis diminuta, moniezia expansa or in the plerocercoids of ligula intestinalis. the plerocercoids of schistocephalus solidus, however, possess an active taurocyamine phosphotransferase, although it too contains no detectable phosphagens. the taurocyamine phosphotransferase of s. solidus has an absolute requirement for a divalent metal ion and atp could not be replaced by itp, gtp, ctp or ... | 1981 | 6259575 |
| [further information on fish parasites from lake trasimeno. ii. observations on the population of scardinius erythrophthalmus l]. | an investigation was carried out to identify the actual state of parasitism in the scardinius erythrophthalmus l. population of trasimeno lake (umbria, italy). seasonal samples of fishes were taken in different points of the litoral and pelagic zones. the parasites found, together with the somatometric values and the characteristics of their localizations are reported. it has been found: a high number of infested specimens; eleven species of parasites, of which five were not yet known to be in t ... | 1983 | 6414493 |
| immunolabelling of fish host molecules on the tegumental surface of ligula intestinalis (cestoda: pseudophyllidea). | immunoblotting, sds-page and western blotting procedures were used to demonstrate cross-reactivity of a polyclonal anti-carp igm antibody with components of roach serum. the polyclonal antibody labelled 2 major bands in both immune and normal roach sera corresponding to molecular masses of approximately 90 and 65 kda. one of these bands (65 kda) was considered to be heavy chain of fish immunoglobulin whilst the identity of the other remains uncertain. this cross-reaction has been exploited in im ... | 1995 | 7622332 |
| [iso-osmotic regulation in cestodes from freshwater fishes]. | the content of sodium, potassium, calcium, and magnesium ions was determined in cestodes ligula intestinalis, eubothrium rugosum, and triaenophorus nodulosus. in freshwater fishes the total concentration of na, k, ca, mg ions in cestode tissue water is practically similar to that of fishes muscles and in serum. it was suggested that examined cestodes have isoosmotic regulation of the water-salt balance. | 1994 | 7816510 |
| 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 |
| length-weight relationship of ligula intestinalis plerocercoids in adult silver bream and discussion on estimation of the parasite age. | the paper comprises an evaluation of ligula intestinalis infection in adult silver bream (blicca bjoerkna), from the nové mlýny reservoirs (czech republic), from 1991 to 1993. the prevalence (mean 4.39%) and intensity (mean 1.39 spec.) of infection were very low, ranging from 1.48% (1.11 spec.) in april-may to 11.52% (1.36 spec.) in november-december. the length-weight relationship of single infection plerocercoids was characterized by the regression and correlation coefficients of linear and ex ... | 1995 | 8541892 |
| immunocytochemical evidence for the presence of prolactin in the plerocercoid of ligula intestinalis (cestoda: pseudophyllidea). | immunoreactivity to prolactin in the nervous system of the plerocercoid of ligula intestinalis was demonstrated by immunocytochemical method. numerous prl immunoreactive perikarya with long varicose fibres were observed in the peripheral nervous system in the worm, mainly in the transversal muscle layer and medullary parenchyma of the midbody. a few fibres were found in the main nerve cords of the central nervous system. prl positive neurons sent their processes to associate with the main nerve ... | 1995 | 8868218 |
| 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 |
| [the parasite-host relations in the system of ligula intestinalis (l.) (cestoda, pseudophyllidae)--the bream]. | proteins and reducing sugars were assayed. the total proteolytic and amylolytic activities were determined in flushes of body cavity of the breams infected and noninfected by plerocercoids ligula intestinalis. infection with l. intestinalis markedly affected the composition of the medium and the activity of enzymes functioning in the body cavity of the bream: protein content increased, total proteolytic activity remained practically unchanged, while the content of reducing sugars and total amylo ... | 1999 | 10576859 |
| 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 |
| 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 |
| ligula intestinalis--a tapeworm contraceptive. | human contraceptives are 'big business', but might the real breakthrough come out from the pharmaceutical industry but from a tapeworm? ligula intestinalis can induce infertility in infected fish of the carp family - both males and females. if the mechanism for this can be discovered, this humble flatworm could drastically change contraceptive practices with one pill for all. | 2002 | 12486303 |
| [effect of ligula intestinalis on lipid metabolism in blood of the host abramis brama]. | the results of analysis in the blood of healthy and ones infected with the plerocercoides ligula intestinalis bream abramis brama l. over index common lipids (cl) and them quality content, peroxidation (pol), peroxide gemoliz erythrocytes (pge), common antioxidant activity (caa) are displayed. it is plerocercoids l. intestinalis effects points character lipids exchanges. at ones infected individual comparatively with healthy increase of cl, alteration correlation lipids fraction, intensification ... | 2003 | 12916398 |
| [apropos of regulation of the tone of plerocercoids in the tapeworm ligula intestinalis]. | | 1964 | 14267821 |
| the taxonomic status of digramma (pseudophyllidea: ligulidae) inferred from dna sequences. | the traditional classification of the ligulid tapeworms into 2 genera, ligula bloch, 1782 and digramma cholodkovsky, 1914, remains controversial. molecular data of sequences for the 5' end of the nuclear 28s ribosomal ribonucleic acid (rrna) gene, the mitochondrial cytochrome c oxidase subunit i (coi) gene, and the nicotinamide adenine dinucleotide dehydrogenase subunit 1 (nd1) gene, as well as the first internal transcribed spacer (its1) of the nuclear ribosomal deoxyribonucleic acid (dna), wer ... | 2003 | 14533692 |
| endocrine disruption, parasites and pollutants in wild freshwater fish. | disruption of the endocrine system has been shown to occur in wild freshwater fish populations across the globe. effects range from subtle changes in the physiology and sexual behaviour of fish to permanently altered sexual differentiation, impairment of gonad development and/or altered fertility. a wide variety of adverse environmental conditions may induce endocrine disruption, including sub-optimal temperatures, restricted food supply, low ph, environmental pollutants, and/or parasites. furth ... | 2003 | 14667177 |
| the phylogeny of diphyllobothriid tapeworms (cestoda: pseudophyllidea) based on its-2 rdna sequences. | phylogenetic analysis of sequences of the its-2 rrna genes of 20 samples of pseudophyllidean cestodes of the family diphyllobothriidae (ligula, digramma, diphyllobothrium, and schistocephalus) from different hosts and geographical regions revealed that: (1) the inclusion of ligulids (previously family ligulidae) to the diphyllobothriidae is correct; (2) schistocephalus appears as the most basal taxon of the diphyllobothriidae, well separated from ligula and digramma, thus supporting the validity ... | 2004 | 15278441 |
| studies on tapeworm physiology; further observations on the development of ligula intestinalis in vitro. | | 1949 | 15392801 |
| parasitism in fish--an endocrine modulator of ecological relevance? | wild bream (abramis brama) were collected from the river elbe, and the influences of parasitic infection by the tapeworm ligula intestinalis on endocrine and related functions (vitellogenin [vtg]; plasma sex steroids: 17beta-estradiol [e2], 11-ketotestosterone [11-kt] and testosterone [t]; relative gonad [gsi] and liver [hsi] growth; maturation stages of germ cells [ms]; prominence of spawning tubercles [sti]) were investigated. distinct regional differences in infection rates of bream with l. i ... | 2005 | 15820100 |
| ligula intestinalis infection as a potential source of bias in the bioindication of endocrine disruption in the european chub leuciscus cephalus. | european chub leuciscus cephalus collected from five localities in the lowland and subalpine regions of austria were analysed for oestrogenic effects of endocrine-disrupting chemicals and the presence of the plerocercoid of the tapeworm ligula intestinalis. of 1494 chub analysed, only seven (six males, one female) were found to be infected with single, but large plerocercoids up to 15 cm in length. ligula-infected fish showed comparatively immature gonads, as demonstrated by the gonadosomatic in ... | 2005 | 15831119 |
| [peculiarities of lipid peroxidation indices in ligula intestinalis (cestoda: pseudophyllidea) and its host--abramis brama (l.)]. | a comparative analysis of indices of peroxidation lipids in tissues of ligula inteslinalis plerocercoids and in the intermediate fish host, the bream abramis brama, was performed for the content of common lipids (cl), malonate di-aldehyde (mda), which is a product of lipid peroxidation (pol), and common antioxidate activity (caa). the dependence of indices upon size of parasites is recovered. the long-sized parasites had higher rate of mda and intense caa. the higher rate of mda and low one of c ... | 2005 | 15907025 |
| comparative study on the accumulation of heavy metals in different organs of tench (tinca tinca l. 1758) and plerocercoids of its endoparasite ligula intestinalis. | concentrations of heavy metals (cu, fe, zn, mn, cr, pb and cd) in some organs of tench and tissues of its parasite found in kovada lake (turkey) were analyzed using atomic absorption spectrophotometry and subsequently compared with the data from sediments and water. only cu, fe, zn and mn were detected in water, sediment, plerocercoids of ligula intestinalis and fish samples, while levels of cr, pb and cd were below the detection limits. four elements were found at higher concentrations in the p ... | 2005 | 15986243 |
| [the effect of ligula intestinalis on some lipid exchange indexes of the spleen of the host, bream abramis brama of different age]. | the results of the comparative analysis of the spleen in healthy individuals of bream abramis brama and those infected by the ligula intestinalis plerocercoids are given. two age groups of bream were studied. the comparison was carried out by the index of common lipids (cl), the content of common lipids, the intensity of lipid peroxidation (pol), and the common antioxidant activity (caa). the dependence of the lipid exchange character in the fishes infected by ligula on age, as well as on differ ... | 2005 | 16134785 |
| 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 |
| how parasitism and pollution affect the physiological homeostasis of aquatic hosts. | parasitism poses a serious threat to hosts under certain circumstances, while the well-being of organisms is also negatively affected by environmental pollution. little information is available on the simultaneous effects of parasites and pollutants on the physiological homeostasis of organisms. the present paper demonstrates that parasites: (i) may influence the metabolism of pollutants in infected hosts, (ii) interact with pollution in synergistic or antagonistic ways, and (iii) may induce phy ... | 2006 | 16768858 |
| suppression of aromatase activity in populations of bream (abramis brama) from the river elbe, germany. | aromatase activity was determined in brain and gonads of wild bream collected along the river elbe, germany, and correlated with other endocrine and reproductive endpoints such as plasma sex steroid concentrations, secondary sex characteristics (sti), plasma vitellogenin, gonad size (gsi), and maturation stages of germ cells (ms) that were reported for the same fish in a previous study. furthermore, regional patterns of aromatase activity were correlated to a number of environmental factors such ... | 2007 | 16860843 |
| [an investigation of parasites of tench (tinca tinca l., 1758) in beyşehir lake]. | the aim of this study that was carried out from march 15, 2003 to february15, 2005 was to determine the parasites of tench (tinca tinca l., 1758) inhabiting the beyşehir lake. during the study, a total of 334 tenches (t. tinca ) were caught in different regions of beyşehir lake monthly and investigated parasitologically. endoparasites in tenches were found to be plerocercoids of ligula intestinalis, caryophyllaeus laticeps, bothriocephalus acheilognathi and proteocephalus torulosus from cestoda, ... | 2006 | 17309041 |
| 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 |
| geography and host specificity: two forces behind the genetic structure of the freshwater fish parasite ligula intestinalis (cestoda: diphyllobothriidae). | parasite species with global distributions and complex life cycles offer a rare opportunity to study alternative mechanisms of speciation and evolution in a single model. here, genealogy and genetic structure, with respect to geography and fish host preference, have been analyzed for ligula intestinalis, a tapeworm affecting freshwater fish. the data analyzed consisted of 109 tapeworms sampled from 13 fish host species in 18 different localities on a macrogeographic scale. two mitochondrial gene ... | 2008 | 18513725 |
| spermiogenesis and spermatozoon of the tapeworm ligula intestinalis (diphyllobothriidea): phylogenetic implications. | using transmission electron microscopy, spermiogenesis and the spermatozoon ultrastructural organization are described in ligula intestinalis (linnaeus, 1758) (diphyllobothriidea), a parasite of the great crested grebe podiceps cristatus (linnaeus, 1758). spermiogenesis starts with the differentiation zone of 2 striated rootlets, 2 centrioles giving rise to 2 flagella, and an intercentriolar body. the latter is composed of 5 electron-dense layers separating 4 electron-lucent layers. in the early ... | 2009 | 18576887 |
| do glial cells exist in the nervous system of parasitic and free-living flatworms? an ultrastructural and immunocytochemical investigation. | it is still unclear whether flatworms have specialized glial cells. at present there are no special methods available for the identification of glial cells in flatworms. the aim of this research was to carry out detailed investigations of the cns in two species ofcestodes, and to get an idea whether these cells may fit into the concept of glia. three types of glial cells have been found in grillotia erinaceus: (1) fibroblast-like cells in the cerebral ganglion (cg); (2) glial cells in bulbar ner ... | 2008 | 18652394 |
| [preliminary studies on the cestodofauna of goosander mergus merganser l., 1758 from west pomerania]. | the research included 54 individuals of the goosander mergus merganser l., 1758 (anseriformes, mergini), wintering on lake dabie within the administrative limits of szczecin. seven species of cestoda from two families were found in those ducks. two species from the family diphyllobothriidae were recorded: ligula intestinalis (linnaeus, 1758) and schistocephalus solidus (müller, 1776), and five species from family hymenolepididae: dicranotaenia mergi yamaguti, 1940, fimbriaria mergi grytner-zieci ... | 2008 | 18702321 |
| interplay of host specificity and biogeography in the population structure of a cosmopolitan endoparasite: microsatellite study of ligula intestinalis (cestoda). | organisms with wide geographical or phenotypic diversity often constitute assemblages of genetically distinct species or lineages. within parasites, an emergence of host-specific lineages is assumed to create such cryptic variability; however, empirical evaluation of these processes is scarce. here, we analyse populations of a parasite with a complex life cycle, wide host spectrum and global distribution, with the aim to reveal factors underlying the evolution of host- or geography-dependent lin ... | 2009 | 19222754 |
| 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 |
| 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 |
| ligula intestinalis (cestoda: diphyllobothriidae) in kenya: a field investigation into host specificity and behavioural alterations. | within the distribution of ligula intestinalis, a tapeworm affecting freshwater fishes, there are genetically distinct and well-separated phylogenetic clusters. east africa is represented by a single monophyletic clade which is understudied compared with euro-mediterranean clades. the present field investigation in the lake baringo and naivasha catchments, kenya, revealed that this l. intestinalis clade was highly host-specific, present in only 2 of 12 fishes examined; barbus paludinosus in naiv ... | 2009 | 19627635 |
| 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 |
| [a study on the helminth fauna linked to seasonal changes and size of the fish host, leuciscus cephalus l., from lake dam orenler, afyonkarahisar]. | in this study, the presence of helminths on 103 leuciscus cephalus from the orenler dam lake, turkey was investigated from july 2007 to may 2008. five parasite species were found in the host fish: of these species dactylogyrus vistuale was found in the gills (42.7%, 10.6+/-14.8 parasite/fish), diplostomum sp. in the lens of eyes (12.6%, 4.1+/-4.0), bothriocephalus acheilognathi in the intestine (23.3%, 4.8+/-10.4), ligula intestinalis in the body cavity (12.6%, 2.1+/-1.2), and pomphorhynchus lae ... | 2009 | 19851976 |
| 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 |
| metal specific partitioning in a parasite-host assemblage of the cestode ligula intestinalis and the cyprinid fish rastrineobola argentea. | when evaluating metal accumulation patterns in parasite-host assemblages species specific metal requirements should be taken into account. the aim of the present study was therefore to determine the metal specific partitioning in a parasite-host assemblage of the cestode ligula intestinalis and the cyprinid fish rastrineobola argentea and to determine the effect of the parasites on the metal balance of the fish. to this purpose the host-parasite assemblage was analysed for several metals at site ... | 2010 | 20064654 |
| ligula intestinalis (cestoda: pseudophyllidea): an ideal fish-metazoan parasite model? | since its use as a model to study metazoan parasite culture and in vitro development, the plerocercoid of the tapeworm, ligula intestinalis, has served as a useful scientific tool to study a range of biological factors, particularly within its fish intermediate host. from the extensive long-term ecological studies on the interactions between the parasite and cyprinid hosts, to the recent advances made using molecular technology on parasite diversity and speciation, studies on the parasite have, ... | 2010 | 20163752 |
| studies on tapeworm physiology: cultivation and development of ligula intestinalis in vitro. | | 1947 | 20255203 |
| parasites of native and exotic freshwater fishes in south-western australia. | in this study, 1429 fishes of 18 different species (12 native and six exotic) were sampled from 29 localities to compare the levels of parasitism between native and exotic fish species and to examine the relationship between environmental degradation and parasite diversity. forty-four putative species of parasites were found and most of these appear to be native parasites, which have not previously been described. two parasite species, lernaea cyprinacea and ligula intestinalis, are probably int ... | 2010 | 20557630 |
| [investigations on ligula intestinalis plerocercoid l., 1758 infection of some fishes from dam lake kunduzlar (kirka, eskişehir).]. | in this study, the presence of ligula intestinalis plerocercoid in some fish species (cyprinus carpio, carassius gibelio, barbus plebejus, capoeta tinca, chondrostoma nasus, leuciscus cephalus, alburnus escherichii) from the kunduzlar dam, turkey was investigated between august 2008 and may 2009. by the end of the study, ligula intestinalis plerocercoid haqs been identified in the body cavity of 3 host fishes [chondrostoma nasus (1.1%, 5.0+/-0), leuciscus cephalus (12.1%, 1.5+/-0,6), and alburnu ... | 2010 | 20597057 |
| ligula intestinalis infection is associated with alterations of both brain and gonad aromatase expression in roach ( rutilus rutilus). | the tapeworm ligula intestinalis commonly infests roach (rutilus rutilus) and is responsible for the inhibition of gonad development. in order to better understand the effect of the plerocercoid on fish physiology, and to discriminate parasitization effects from those of endocrine-disrupting compounds (edc), cyp19b and cyp19a aromatase expression was investigated by real-time quantitative polymerase chain reaction (pcr) in brain and gonads of ligulosed roach, caught from a reference site. data w ... | 2010 | 21062527 |
| [compared parasitic infection of ligula intestinalis (cestoda: diphyllobothridae) in cyprinidae species: rutilus rubilio and scardinius erythrophthalmus in two dam reserves in tunisia]. | monitoring quantitative parameters of parasitism by ligula intestinalis (cestoda: diphyllobothridae) was performed by examining 516 fish belonging to two introduced freshwater species: rutilus rubilio (350 individuals) and scardinius erythrophthalmus (166 individuals). these fish were collected in two dam reserves in tunisia, sidi salem and nebhana. the analysis of the aquatic bird's composition in these two reserves revealed the existence of piscivorous bird species that were previously reporte ... | 2010 | 21077391 |
| inhibition of gametogenesis by the cestode ligula intestinalis in roach (rutilus rutilus) is attenuated under laboratory conditions. | reproductive parameters of ligula intestinalis-infected roach (rutilus rutilus) which were held under long-tem laboratory conditions with unlimited food supply were investigated. although uninfected and infected roach showed no difference in condition factor and both groups deposited perivisceral fat, the gonadosomatic-index was significantly lower in infected female and male roach. quantitative histological analysis revealed that gonad development was retarded upon parasitization in both gender ... | 2010 | 21092374 |
| fish hepatic glutathione-s-transferase activity is affected by the cestode parasites schistocephalus solidus and ligula intestinalis: evidence from field and laboratory studies. | summarythe activity of hepatic glutathione-s-transferase (gst) was analysed in 3 different fish species with respect to fish sex and infection with parasites. in both sexes of laboratory bred three-spined sticklebacks (gasterosteus aculeatus) experimentally infected with schistocephalus solidus (cestoda), a significantly lower gst-activity was found for infected fish compared to control. after field sampling of roach (rutilus rutilus) from lake müggelsee (ms) and the reservoir listertalsperre (l ... | 2011 | 21518465 |
| parasites modify sub-cellular partitioning of metals in the gut of fish. | infestation of fish by parasites may influence metal accumulation patterns in the host. however, the subcellular mechanisms of these processes have rarely been studied. therefore, this study determined how a cyprinid fish (rastrineobola argentea) partitioned four metals (cd, cr, zn and cu) in the subcellular fractions of the gut in presence of an endoparasite (ligula intestinalis). the fish were sampled along four sites in lake victoria, kenya differing in metal contamination. accumulation of cd ... | 2012 | 22100616 |
| [The Seasonal Distribution and Effect of Tench Fish (Tinca tinca L., 1758) Helminthes Parasites Living in Terkos Lake]. | Objective: The aim of this study, carried out from August, 2009 to July, 2010, was to determine the seasonal distribution of tench fish (Tinca tinca L. 1758) helminthes inhabiting the Terkos lake. Methods: Living fish gathered from the study area were brought into the laboratory. The species analysis done by ecto and endo parasites of the fish were investigated. Results: During the study, a total of 165 tenches (T. tinca) were investigated. Endoparasites in tenches were f ... | 2011 | 22203507 |
| haematological characteristics associated with parasitism in bream, abramis brama orientalis. | a parasitological investigation was done on 175 specimens. infections of a. brama orientalis were analyzed according to the age and sex. the fish also were examined for evaluation changes of haematological parameters in relation to parasitic infection. four parasites were found, including-caryophyllaeus laticeps and ligula intestinalis (cestoda), diplostomum spathaceum (platyhelminthes) and trichodina sp. (ciliophora). among identified parasites maximum prevalence and mean intensity were related ... | 2014 | 25320488 |
| in vitro leukocyte response of three-spined sticklebacks (gasterosteus aculeatus) to helminth parasite antigens. | helminth parasites of teleost fish have evolved strategies to evade and manipulate the immune responses of their hosts. responsiveness of fish host immunity to helminth antigens may therefore vary depending on the degree of host-parasite counter-adaptation. generalist parasites, infective for a number of host species, might be unable to adapt optimally to the immune system of a certain host species, while specialist parasites might display high levels of adaptation to a particular host species. ... | 2014 | 24176687 |
| pcbs in fish and their cestode parasites in lake victoria. | polychlorinated biphenyls (pcbs) are classified as persistent organic pollutants (pops) regulated by the stockholm convention (2001). although their production and use was stopped almost three decades ago, pcbs are environmental persistent, toxic, and bioaccumulate in biota. we assessed the levels of 7 pcb congeners (iupac nos. 28, 52, 101, 118, 138, 153, and 180) in sediment and fish (oreochromis niloticus, lates niloticus, and rastrineobola argentea) and evaluated the potential of cestode fish ... | 2016 | 27456696 |
| mass death of predatory carp, chanodichthys erythropterus, induced by plerocercoid larvae of ligula intestinalis (cestoda: diphyllobothriidae). | we describe here the mass death of predatory carp, chanodichthys erythropterus, in korea induced by plerocercoid larvae of ligula intestinalis as a result of host manipulation. the carcasses of fish with ligulid larvae were first found in the river-edge areas of chilgok-bo in nakdong-gang (river), korea at early february 2016. this ecological phenomena also occurred in the adjacent areas of 3 dams of nakdong-gang, i.e., gangjeong-bo, dalseong-bo, and hapcheon-changnyeong-bo. total 1,173 fish car ... | 2016 | 27417095 |
| dynamics and effects of ligula intestinalis (l.) infection in the native fish barbus callensis valenciennes, 1842 in algeria. | the dynamics of the emergence, duration, and decline phases in epizootic cycles are well known for humans and some crops, but they are poorly understood for host-parasite systems in the wild. parasites may be particularly insidious as they are often introduced unintentionally, simultaneously with their hosts, and later transferred to species in the new location. here we investigate the epizootic dynamics of the tapeworm ligula intestinalis in the hamiz reservoir, algeria, and explore its effects ... | 2016 | 27078654 |
| [parasites of the common roach (rutilus rutilus l.) under the impact of industrial pollution of a lake]. | the consequences of man-induced transformation of lake kostomukshskoe (tailings dump) related to increased mineralization and entry of highly dispersed dredge material not typical for northern lakes were studied using roach parasites as the example. it was found that the roach parasite fauna has been losing rare and scant parasite species of different taxonomic groups, mainly helminthes with an indirect life cycle. common and dominant species of myxosporidians, monogeneans, trematodes of genera ... | 2016 | 26946825 |
| ultrastructural study of vitellogenesis of ligula intestinalis (diphyllobothriidea) reveals the presence of cytoplasmic-like cell death in cestodes. | the tapeworm ligula intestinalis (diphyllobothriidea) is one of the most fascinating cestode parasites because it may cause parasitic castration of its second intermediate host, teleost freshwater fishes, due to inhibition of production of fish gonadotropic hormones. large-sized (length up to 1 m) larvae called plerocercoids develop several months in the body cavity of freshwater fish and affect host behavior to facilitate transmission to the final host, a fish-eating bird. vitellogenesis, i.e. ... | 2015 | 26640506 |
| infections of ligula intestinalis on freshwater fish in kars plateau of north-eastern anatolia, turkey. | this study was conducted to determine the prevalence of ligula intestinalis and infections caused by these on freshwater fish in rivers and streams in the kars plateau of north-eastern anatolia, turkey. | 2015 | 26470929 |
| competition and facilitation between a disease and a predator in a stunted prey population. | the role of diseases and parasites has received relatively little attention in modelling ecological dynamics despite mounting evidence of their importance in structuring communities. in contrast to predators, parasites do not necessarily kill their host but instead they may change host life history. here, we study the impact of a parasite that selectively infects juvenile prey individuals and prevents them from maturing into adults. the model is inspired by the ligula intestinalis tape worm and ... | 2015 | 26147293 |
| [age-related dynamics of roach infection rate with ligula intestinalis (cestoda: ligulidae) plerocercoids and probability of its usage for the calculation of host death rate]. | results of special parasitological dissections of roach samples from catches with the same fishing gear and at the same station (monakhovo cove, chivyrkui bay of the lake baikal) and at the same time in different years (1998-2002) are given. stability of age-related dynamics of roach infection rate with ligula intestinalisis in different years with the maximum of prevalence and mean abundance in fish of 3+ age, and the following sharp decrease in these rates in elder age groups, was revealed. ba ... | 2015 | 25693329 |
| immune response in spirlins (alburnoides bipunctatus, bloch 1782) infested by ligula intestinalis parasite. | ligula intestinalis parasite is a cestode that can cause remarkable damages to fishes. sds-page is one of the methods that can be used to determine the immune serum band polymorphism and immune responses in fishes infested by ligula intestinalis. this study reports the results of an investigation conducted using sds-page focusing on immune serum band polymorphism and on the reaction of the immune system in spirlins (alburnoides bipunctatus) infested by pleurocercoids of ligula intestinalis paras ... | 2013 | 24058932 |
| influence of the cestode ligula intestinalis and the acanthocephalan polymorphus minutus on levels of heat shock proteins (hsp70) and metallothioneins in their fish and crustacean intermediate hosts. | it is a common method to analyse physiological mechanisms of organisms - commonly referred to as biomarkers - to indicate the presence of environmental pollutants. however, as biomarkers respond to a wide range of stressors we want to direct the attention on natural stressors, i.e. on parasites. after two years maintenance under controlled conditions, roach (rutilus rutilus) revealed no influence on levels of metallothionein by the parasite ligula intestinalis. the same was found for gammarus fo ... | 2013 | 23770459 |
| reproductive and health assessment of fathead minnows (pimephales promelas) inhabiting a pond containing oil sands process-affected water. | previous laboratory based studies have shown that oil sands process-affected waters (ospws) containing high concentrations of naphthenic acids (>25 mg/l) have adverse effects on the reproductive physiology of fish. the purpose of this study was to assess the reproductive development and health of a wild population of fathead minnows (pimephales promelas) inhabiting an ospw pond that has moderate concentrations of naphthenic acids (~10 mg/l). fathead minnows were collected at various times during ... | 2013 | 23416413 |
| determination of the electrophoretic pattern of somatic and excretory-secretory proteins of ligula intestinalis parasite in spirlin (alburnoides bipunctatus). | ligula intestinalis parasite is a cestodes that causes remarkable damages to fish. it is also of prime importance in economic and hygienic aspects. sds-page and western blotting are the methods that can be used to determine the electerophoretic pattern of somatic and excretory-secretory proteins of parasites. in this study, after obtaining the plerocercoidal stage of this parasite from the spirlin (alburnoides bipunctatus), its somatic proteins were prepared using ultrasonicae, and excretory-sec ... | 2012 | 23202596 |
| [the nature of changes of some immunophysiological characteristics in bream (abramis brama) infected with plerocercoids (ligula intestinalis) at various stages of parasite development]. | the data from studies of the antimicrobial properties of blood serum, the content of total lipids, and antioxidant activity of immunocompetent tissues and organs of breams abramis brama infected with plerocercoids ligula intestinalis depending on the phase of development of the parasite are presented. the quantitative characteristics of the studied parameters are determined. | 2016 | 23136746 |
| dynamics of metal uptake and depuration in a parasitized cyprinid fish (rastrineobola argentea). | infestation of fish by endoparasites may potentially influence metal uptake and elimination by the host. we quantified the metal uptake rate constant (k(u)) and efflux rate constants (k(e)) of radiolabeled cd and co in the cyprinid fish rastrineobola argentea experimentally infected with the parasite ligula intestinalis. during 24h, the accumulation of cd and co increased linearly with no evident steady state in uninfected fish, infected fish and in the parasite. following aqueous exposures, the ... | 2012 | 22885798 |
| [impact of ligula intestinalis (l.1758) (cestode), on the growth of barbus setivimensis (cyprinidae) in a lake system in algeria]. | the algerian freshwater fish fauna is mainly represented by the cyprinidae family, in particular, the genus barbus. this is represented only by natural populations of the subgenus barbus. the systematic, based mainly on the methods of biometrics, is quite different from one author to another. however, two nominal species are usually cited: barbus callensis (valenciennes, 1842), which is limited to the region of el kala (eastern algeria) and barbus setivimensis (valenciennes, 1842) in other parts ... | 2012 | 22578576 |
| nutritional status and gene expression along the somatotropic axis in roach (rutilus rutilus) infected with the tapeworm ligula intestinalis. | the tapeworm ligula intestinalis inhibits gametogenesis of its fish host, the roach (rutilus rutilus). we investigated whether l. intestinalis infection makes significant demands on nutritional resources and consequently manipulates the endocrine somatotropic axis of roach. two groups of naturally infected and uninfected roach were studied: a field group (natural feeding) and a laboratory group (ad libitum food supply). in females, no significant impact of parasitization on storage substrates (g ... | 2012 | 22542897 |
| host switch and infestation by ligula intestinalis l. in a silver bream (blicca bjoerkna l.) population. | sampling of the fish community was carried out for 20 years in the mirgenbach reservoir, in north-eastern france. the prevalence and the mean intensity of ligula intestinalis (cestoda) were analysed in roach (rutilus rutilus) and silver bream (blicca bjoerkna) populations, the main two infected species. the aim of this study was to investigate the host switch from roach to silver bream and the consequences of l. intestinalis infestation in silver bream, which is an unusual host for this parasite ... | 2012 | 22217256 |
| spatial and temporal distribution of ligula intestinalis (cestoda: diphyllobothriidea) in usipa (engraulicypris sardella) (pisces: cyprinidae) in lake nyasa. | engraulicypris sardella is an endemic and economically important cyprinid species in lake nyasa/malawi which has recently been infected by the tapeworm ligula intestinalis. this parasite is known to induce severe pathological and behavioural effects on other cyprinids, including castration, followed by a collapse of infected populations. as a first step to understanding the dynamics between this parasite and e. sardella, we studied the spatial and temporal variation in prevalence over a period o ... | 2017 | 28818117 |
| the invasive cestode parasite ligula from salmonids and bullies on the south island, new zealand. | freshwater ecosystems are often impacted by biological invasions, including the introduction of exotic parasites capable of infecting native species. here, we report the occurrence of the introduced tapeworm ligula sp. from common bully, gobiomorphus cotidianus, and quinnat salmon, oncorhynchus tshawytscha, in lake hawea, south island, new zealand. this parasite has a complex life cycle, reaching its adult stage in fish-eating birds. worms recovered from the body cavity of fish hosts reached hug ... | 2018 | 29177582 |