| use of confidence ellipses to detect effects of parasites on the growth of yellow perch, perca flavescens. | determining the causes of mortality in populations of fish is inherently difficult. to simplify the determination of whether parasite-induced mortality occurs, parasitologists have relied on 3 types of subjective analyses of graphs. peaked host age-parasite intensity curves concomitant with a decrease in the degree of dispersion (measured by variance-to-mean ratio) of parasites in older age-classes of fishes, a slope of less than 2.0 for a log-log graph of variance versus mean intensity of infec ... | 1992 | 1738070 |
| helminth position within the intestine of naturally infected pike (esox lucius) relative to host stomach contents. | the positions of 3 cestode species, triaenophorus crassus forel, triaenophorus nodulosus (pallas), and proteocephalus pinguis larue, and a nematode, raphidascaris acus (bloch), within the intestine of naturally infected pike (esox lucius l.) were evaluated with respect to the presence or absence and state of digestion of host stomach contents. the positions of scolices and strobilae of the cestodes did not vary with respect to host stomach contents. by contrast, r. acus was anterior (near the st ... | 1989 | 2614600 |
| parasitological study of a population of tiber river eels (anguilla anguilla). | a study was conducted on the parasitofauna of anguilla anguilla caught in the section of the tiber river south of rome (italy). the sample examined consisted of 417 specimens that were classified by stage (elver, young yellow eel, yellow eel and silver eel) and season of sampling. the following species were identified: trypanosoma granulosum, eimeria anguillae, myxidium giardi, sphaerospora reichenowi, myxobolus sp., trichodina anguilli, ichthyohodo sp., gyrodactylus anguillae, bothriocephalus c ... | 1987 | 3508508 |
| raphidascaris acus (bloch, 1779) in northern pike, esox lucius l., walleye, stizostedion vitreum vitreum (mitchill), and yellow perch, perca flavescens (mitchill), from central canada. | | 1986 | 3735597 |
| [biological characteristics of raphidascaris acus (anisakidae: ascardata), a parasite of freshwater fish]. | | 1974 | 4449652 |
| liver pathology of yellow perch, perca flavescens (mitchill), infected with larvae of the nematode raphidascaris acus (bloch, 1779). | larvae of the nematode raphidascaris acus were found free or encapsulated in the liver of yellow perch. blood vessels were distorted or destroyed during larval migrations and larvae were eventually encapsulated in a thick-walled whitish nodule. successful walling-off of the parasite resulted in the formation of a collagenous nodule and a complete loss of the worm. no mortality of perch was associated with larval r. acus but the introduction of susceptible fishes into a lake harboring this parasi ... | 1984 | 6530717 |
| 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 |
| the amphipod gammarus fossarum as a natural true intermediate host of the nematode raphidascaris acus. | a single third-stage larva of the fish nematode raphidascaris acus (bloch, 1779) (body length 1.77 mm) was found in 1 of 775 gammarids gammarus fossarum koch examined from the jihlava river, czech republic. this is the first confirmed record of the advanced l, of this species from an invertebrate host, showing that an invertebrate may serve as true intermediate host of this nematode, in addition to lower aquatic vertebrates. until now, invertebrates have generally been considered as paratenic ho ... | 1996 | 8691386 |
| the contributions of host age and size to the aggregated distribution of parasites in yellow perch, perca flavescens, from garner lake, alberta, canada. | the independent effects of host age and size on parasite abundance are examined in yellow perch from garner lake in east-central alberta. older, larger perch tend to have more species of parasites combined with larger parasite infrapopulations. sexual size dimorphism in perch generates 2 different size classes within each age class >2+ yr, thus allowing the opportunity to separate the effects of age and size on the recruitment of parasites by perch. the abundances of diplostomum adamsi and bothr ... | 1998 | 9488333 |
| the ecology of endoparasitic helminth infections of brown trout (salmo trutta) and rainbow trout (oncorhynchus mykiss) in scotland. | two hundred and forty brown trout (salmo trutta) and 49 rainbow trout (oncorhynchus mykiss), obtained from 21 locations in central scotland between october 1990 and august 1993, were examined for endoparasitic helminth infections. crepidostomum farionis (digenea) was the most widely distributed helminth species, followed by eubothrium crassum (cestoda), diphyllobothrium dendriticum and d. ditremum (cestoda), neoechinorhynchus rutili (acanthocephala), echinorhynchus truttae (acanthocephala), eust ... | 1995 | 9599425 |
| richness and diversity of parasite communities in european eels anguilla anguilla of the river rhine, germany, with special reference to helminth parasites. | a total of 121 european eels (anguilla anguilla) from 2 sampling sites on the river rhine were investigated in respect of their parasite communities. special attention was given to the swim bladders, intestines, gills and fins of the fish. twelve different parasite species were found to live in and on the eels. data from each sampling site were kept separate. parasites found in descending order of prevalence were: anguillicola crassus, trypanosoma granulosum, myxobolus sp., paratenuisentis ambig ... | 1999 | 10503258 |
| evaluation of an elisa and immunoblotting for studying the humoral immune response in anguillicola crassus infected european eel anguilla anguilla. | the applicability of an enzyme-linked immunosorbent assay (elisa) for the detection of anguillicolosis in feral eels was examined using a crude antigen preparation from the body wall of adult anguillicola crassus. the screening consisted of samples from 100 feral european eels anguilla anguilla. as a reference the actual status of infection was determined by dissection of the eels' swim-bladders. the elisa results were compared with a background value calculated from the results obtained from 43 ... | 2000 | 11129379 |
| rodlet cells and other inflammatory cells of phoxinus phoxinus infected with raphidascaris acus (nematoda). | rodlet cells (rcs), and other inflammatory cells, namely eosinophile granule cells (egcs), eosinophilic granulocytes and epithelioid cells in the liver, pancreas and peritoneal serosa of uninfected and naturally parasitized minnow phoxinus phoxinus (linnaeus, 1758), were studied by light and electron microscopy. forty-eight minnows were examined and in 18 fishes encysted larvae of the nematode raphidascaris acus (bloch, 1779) were encountered, mainly in the pancreas. the number of larvae in the ... | 2000 | 11129382 |
| circulation of parasites among fishes from lakes in the caribou mountains, alberta, canada. | circulation of 24 macroparasite species among 12 species of fish was evaluated within samples of hosts collected from 9 lakes on an isolated plateau in northern alberta, canada. twenty-seven parasite taxa (24 species plus the larval stages of triaenophorus crassus, t. stizostedionis, and raphidascaris acus) had the potential to be circulated among hosts. sixteen parasite taxa were recovered from a single host species within a lake. of the 11 remaining nonspecialist taxa, 4 were larval stages tha ... | 2003 | 12760632 |
| observations on the metazoan parasites of the atlantic salmon (salmo salar) after its reintroduction into the elbe river basin in the czech republic. | in the years 1999-2002, first studies were carried out on the metazoan parasites of atlantic salmon (salmo salar l.) recently reintroduced into the elbe river drainage system, after more than 50 years after the complete extinction of the elbe salmon population. a total of six helminth species were recorded from salmon smolts from three streams of the elbe river basin (kamenice river, jestedský and libocanský brooks) in north bohemia, czech republic, where s. salar fingerlings have been released ... | 2003 | 14971599 |
| raphidascaris acus (bloch, 1779) larvae infections of the stone loach, barbatula barbatula (l.), from the river haná, czech republic. | the stone loach, barbatula barbatula (l.), is a typical and dominant intermediate host of raphidascaris acus in lowland streams of central europe. the prevalence of infection of r. acus in b. barbatula from the river haná ranged throughout the year from 73.3 to 100%. the abundance and the mean intensity of infection also varied throughout the year with a peak in september. larvae were located mainly in the liver parenchyma. high numbers of larvae and their migration through the tissue caused cys ... | 2004 | 15009247 |
| helminths in leuciscus cephalus from the river adda, lombardy, northern italy. | chubs (leuciscus cephalus) were caught at various locations along the river adda and from lake of como (lombardy, northern italy) and endoparasitic helminths were studied in order to integrate the knowledge on distribution of helminth fauna of chubs in lombardy and to investigate on the structure of its parasite infracommunities with respect to different habitat typologies. the following species of parasites were isolated: pomphorynchus laevis, allocreadium markewitschi, parasymphylodora markewi ... | 2003 | 15267000 |
| associations between fish reproductive cycle and the dynamics of metazoan parasite infection. | the parasite fauna of the stone loach (barbatula barbatula) was investigated monthly from may to december 2001. four parasite species were recorded: gyrodactylus spp. (monogenea), tylodelphys clavata (digenea), proteocephalus sagittus (cestoda), and raphidascaris acus (nematoda). the changes in the seasonal dynamics of parasite infection were investigated throughout the 8 months. the potential effect of the reproductive investment of the host, measured by gonad mass and gonado-somatic index (gsi ... | 2005 | 15565460 |
| long-term investigation of the composition and richness of intestinal helminth communities in the stocked population of eel, anguilla anguilla, in neusiedler see, austria. | data from a long-term study of the intestinal helminth parasite community of eels, anguilla anguilla, stocked into the shallow eutrophic neusiedler see, austria, were collected over an 8 year period (1994-2001). in total, 720 eels from 2 sampling sites were examined. the parasite community showed characteristics similar to those in the natural eel populations in rivers of the uk and mainland europe: it was species poor, with only 5 species (acanthocephalus lucii, acanthocephalus anguillae, raphi ... | 2005 | 15727068 |
| joint effects of parasitism and pollution on oxidative stress biomarkers in yellow perch perca flavescens. | yellow perch perca flavescens were collected from a contaminated site and a reference site in the st. lawrence river, quebec, canada. fish were assessed for oxidative stress (lipid peroxidation and reduced glutathione levels) and parasitism by the nematode raphidascaris acus and metacercariae of the digenean apophallus brevis. lipid peroxidation is not only considered a measure of oxidative stress, but of stress in general, and thus serves as an indicator of fish health. fish from the contaminat ... | 2005 | 15759803 |
| prevalence of anisakin nematodes in fish from southern baltic sea. | nematodes from the superfamily ascaridoidea (families anisakidae and raphidascarididae) are worldwide distributed parasites. their live cycles include many species of water invertebrates and teleostean fish as intermediate hosts, and fish, sea mammals or fish-eating birds being definitive hosts. humans can be infected with some of these parasites after consumption of raw or wrongly processed fish. the parasitological investigations of fish (herring, cod and flatfish) from southern baltic (ices 2 ... | 2005 | 16457379 |
| helminth communities of european eels anguilla anguilla (linnaeus, 1758) from the vistula lagoon and puck bay, poland. | within 2001-2002 a total of 621 eel anguilla anguilla (l., 1758) (488 from the vistula lagoon and 133 from the puck bay) were examined. fifteen parasite taxa were recovered: pseudodactylogyrus anguillae (yin et sproston, 1948), brachyphallus crenatus (rudolphi, 1802), deropristis inflata (molin, 1859), diplostomum spp., bothriocephalus claviceps (goeze, 1782), proteocephalus macrocephalus (creplin, 1825), anguillicola crassus (kuwahara, niimi et itagaki, 1974), camallanus lacustris (zoega, 1776) ... | 2005 | 16838624 |
| nematodes of the intestine and swimbladder of the european eel anguilla anguilla (l.) ascending pomeranian rivers. | the study focused on the eel (length and weight averaging 23.1 cm and 13.7 g, respectively) ascending pomeranian rivers in summers of 1999 - 2003. the swim bladder was examined in 322 individuals, the intestine being examined in 272 fish. anguillicola crassus was present in the swim bladder of 184 fish. infection prevalence varied between the rivers, the highest prevalence being recorded in the eel caught in the radew (65.6%) and the lowest in the wieprza (41.7%). the intensity of infection was ... | 2004 | 16892600 |
| [seasonal distributions and effects of parasites in pike (esox lucius l., 1758) inhabiting the işikli dam lake (denizli).] | the aim of this study carried out from december 2000-november 2001 was to determine the endoparasites of pike (esox lucius l., 1758) inhabiting the işikli dam lake. a total of 160 samples were caught and investigated parasitologically. bathybothrium rectangulum (cestoda), raphidascaris acus, camallanus truncatus (nematoda) and neoechinorhynchus rutili (acanthocephala) were detected as a result of this study. r. acus was the most prevalent species. the highest seasonal infection in the pike sampl ... | 2005 | 17124691 |
| do eel parasites reflect the local crustacean community? a case study from the rhine river system. | in 2003, the parasite fauna of 197 european eels anguilla anguilla, captured at three different locations (laufenburg, karlsruhe and beneeden leeuwen) in the river rhine, was analysed. the eels harboured a total of 18 species, among them the protozoa (myxidium giardi, myxobolus kotlani and trypanosoma granulosum), acanthocephalans (acanthocephalus anguillae, acanthocephalus lucii, echinorhynchus truttae, pomphorhynchus laevis), nematodes (paraquimperia tenerrima, pseudocapillaria tomentosa, cama ... | 2007 | 17578598 |
| parasite communities of eels anguilla anguilla in freshwater and marine habitats in iceland in comparison with other parasite communities of eels in europe. | ninety-five eels from one marine and three freshwater localities in iceland were examined for parasites. twenty species were found, 12 from marine habitat, 12 from freshwater and 4 species were found in both habitats. these are: eimeria anguillae, chilodonella hexasticha, trichodina fultoni, t. jadranica, myxidium giardi, myxobolus kotlani, two zschokkella spp., derogenes varicus, deropristis inflata, diplostonmum sp., plagioporus angulatus, podocotyle atomon, anisakis simplex (larva), eustrongy ... | 2007 | 17886743 |
| [parasite fauna of the european river lamprey lampetra fluviatilis (l.) from lake onega]. | data on the parasite fauna of the adult european river lamprey lampetra fluviatilis (l.) from lake onega are reported. ten parasite species are found, including trematodes diplostomum petromyzifluviatilis and d. spathaceum (metacercariae), cestode proteocephalus longicollis, nematodes cucullanus truttae and raphidascaris acus, acanthocephalan echinorhynchus salmonis, ectoparasitic infusoria chilodonella hexastica, trichodina tenuidens, and trichodinella epizootica, and fungus saprolegnia parasit ... | 2007 | 17957959 |
| accumulation of some heavy metals in raphidascaris acus (bloch, 1779) and its host (esox lucius l., 1758). | concentrations of some heavy metals (fe, zn, cu, mn and cr) in liver of pike (esox lucius l., 1758) and its endoparasite [raphidascaris acus (bloch, 1779)] inhabiting işikli lake (turkey) were analyzed using atomic absorption spectrophotometry. only fe and zn were detected in r. acus and liver of fish, while levels of cu, mn and cr were below detection limit (<0.028). the fe and zn level in r. acus were 68.4 and 86.9 times higher than in the liver. nematodes could provide reliable information ab ... | 2007 | 18224628 |
| parasitic nematodes of pumpkinseed sunfish (lepomis gibbosus l., 1758) from warm-water canal of a power plant in szczecin, poland. | parasitological examination of 273 pumpkinseed sunfish, caught in the warm water channel at the dolna odra power plant in stare czarnowo near szczecin was carried out. the total lengths of the fish ranged from 6.8 to 18.1 cm (13.3 cm means), infected fish 9.8 to 17.5 cm. in 48 individuals the presence of nematodes representing 4 species has been found: schulmanela petruschewskii, raphidascaris acus, spiroxys contortus and contracaecum sp. in total the number of nematodes found was 319, the mean ... | 2008 | 19055062 |
| the interaction between an introduced fish host and local parasite fauna: neogobius kessleri in the middle danube river. | parasite communities of introduced fish neogobius kessleri günther (gobiidae) were studied at five localities in the slovak section of the danube river during 2002-2005. thirty-three metazoan parasite species were identified. all fish were infected with at least two parasite species; most of the parasite species were generalists. at all sampling sites, high susceptibility to local parasites was observed. the parasite community was dominated by three parasite species: glochidia of anodonta anatin ... | 2009 | 19288135 |
| parasites of the deepwater sculpin (myoxocephalus thompsonii) across its canadian range. | deepwater sculpin (myoxocephalus thompsonii) were collected from 19 lakes across the species' distribution in canada and examined for parasites. six helminth species (crepidostomum farionis, bothriocephalus cuspidatus, proteocephalus sp., cyathocephalus truncatus, raphidascaris acus, and echinorhynchus salmonis), 1 crustacean species (ergasilus nerkae), and 1 molluscan species (glochidia) parasitized these hosts. crepidostomum farionis, proteocephalus sp., r. acus, e. nerkae, and the glochidia r ... | 2009 | 19382824 |
| [helminth fauna of bufo raddei in transbaikalia]. | helminth fauna of bufo raddei from transbaikalia has been studied in 2003-2007. eleven species of parasites nematoda were found in this host, namely rhabdias bufonis (schrank, 1788), oswaldocruzia filiformis (goeze, 1782), oswaldocruzia yezoensis morishita, 1926, contracaecum osculatum (rudolphi, 1802), raphidascaris acus, larvae, aplectana acuminata (schrank, 1788), aplectana multipapillosa ivanitzky, 1940, cosmocerca commutata (diesing, 1851), cosmocerca ornata (dujardin, 1845), cosmocercoids ... | 2010 | 20536007 |
| [peculiarities of the parasitofauna of atlantic salmon parr (salmo salar l.), brown trout (salmo truttae l.), and char (salvelinus alpinus l.) in the utsjoki river system (northern finland)]. | data on the parasite diversity in salmonidae fish parr from different parts of the utsjoki river obtained during 1993-1995 and 2006-2007 are presented. three fish species, salmo salar l., s. truttae l., and salvelinus alpinus l., were examined on the presence of helminthes. twenty species of salmon parasites were found, the majority of which are the parasites with complicated life cycles. infusorians c apriniana piscium, myxosporidia chloromyxum januaricus and myxobolus neurobius, metacercaria o ... | 2011 | 21598666 |
| parasitic infection of an endemic fish (blicca bjoerkna) and an exotic fish (hemiculter beucisculus) in anzali lagoon, caspian sea, iran. | in anzali lagoon, there are some endemic and exotic fishes. the present study was conducted to compare the parasitic fauna of blicca bjeorkna, as an endemic fish and hemiculter leucisculus, as an introduced fish to the lagoon. | 2011 | 22347299 |
| invasive ponto-caspian amphipods and fish increase the distribution range of the acanthocephalan pomphorhynchus tereticollis in the river rhine. | non-indigenous species that become invasive are one of the main drivers of biodiversity loss worldwide. in various freshwater systems in europe, populations of native amphipods and fish are progressively displaced by highly adaptive non-indigenous species that can perform explosive range extensions. a total of 40 ponto-caspian round gobies neogobius melanostomus from the rhine river near düsseldorf, north rhine-westphalia, germany, were examined for metazoan parasites and feeding ecology. three ... | 2012 | 23300895 |
| nematode eel parasite found inside acanthocephalan cysts--a "trojan horse" strategy? | the invasive eel parasite anguillicoloides crassus (syn. anguillicola crassus) is considered one of the major causes for the decline of the european eel (anguilla anguilla) panmictic population. it impairs the swim bladder function and reduces swimming performance of its host. the life cycle of this parasite involves different intermediate and paratenic hosts. despite an efficient immune system of the paratenic fish hosts acting against infections with a. crassus, levels of parasitized eels rema ... | 2014 | 25403767 |
| hematological parameters associated with parasitism in pike, esox lucius caught from anzali wetland. | this study involved 120 pike, esox lucius, captured from anzali wetland. parasite fauna were identified in captured fish. also, changes of haematological parameters were compared both infected and uninfected fish. parasitological inspections revealed the following infestations: skin: lernea cyprinacea, argulus foliaceus (crustacean) and tricodina sp. (ciliatea). gill: dactylogyrus sp. (digenea) and tetraonchus monenteron (monogenea). eye: diplostomum spathaceum (digenea). gut: eustrongylides exi ... | 2015 | 26064009 |
| investigation of parasites of pikes (esox lucius linnaeus, 1785) from chamkhale river, anzali and amirkelayeh wetlands, iran. | to investigate the health status, the parasite diversity and abundance were studied in three pike populations. for this purpose, totally 90 fish were caught from three natural habitats of pike including chamkhale river, anzali and amirkelayeh wetlands, iran. after biometry and age determination, fish were dissected and parasites were investigated in intestine, gill and eye. according to results, five parasite species were identified in whole body of pikes including eustrongylides exises, raphida ... | 2016 | 27605833 |
| fine structure and cellular responses at the host-parasite interface in a range of fish-helminth systems. | a series of ultrastructural-based studies were conducted on the interface region in different fish-helminth systems: (a) an intestinal infection of the cestode monobothrium wageneri in tench, tinca tinca; (b) an extensive intestinal submucosa and mucosal infection in tench by metacercariae of an unidentified digenean trematode; (c) an intestinal infection in brown trout, salmo trutta, by the acanthocephalan dentitruncus truttae; (d) an extraintestinal infection by larvae of the acanthocephalan, ... | 2015 | 25613477 |
| raphidascaris (raphidascaris) macrouri n. sp. (nematoda: anisakidae) from two deep-sea macrourid fishes in the western mediterranean: morphological and molecular characterisations. | a new nematode species, raphidascaris (raphidascaris) macrouri n. sp. (anisakidae), is described from male and female specimens found in the intestine, and occasionally in stomach and pyloric caeca, of two deep-water macrourid fishes (gadiformes) off barcelona, mediterranean sea: nezumia aequalis (günther) (type-host) and trachyrincus scabrus (rafinesque). based on light and scanning electron microscopy examination, the new species shows similar morphological features as the other four valid spe ... | 2015 | 25979612 |
| intestinal nematodes affect selenium bioaccumulation, oxidative stress biomarkers, and health parameters in juvenile rainbow trout (oncorhynchus mykiss). | in environmental studies, parasites are often seen as a product of enhanced host susceptibility due to exposure to one or several stressors, whereas potential consequences of infections on host responses are often overlooked. therefore, the present study focused on effects of parasitism on bioaccumulation of selenium (se) in rainbow trout (oncorhynchus mykiss). joint effects of biological (parasite) and chemical (se) stressors on biomarkers of oxidative stress (glutathione-s-transferase (gst), s ... | 2015 | 25633167 |
| getting what is served? feeding ecology influencing parasite-host interactions in invasive round goby neogobius melanostomus. | freshwater ecosystems are increasingly impacted by alien invasive species which have the potential to alter various ecological interactions like predator-prey and host-parasite relationships. here, we simultaneously examined predator-prey interactions and parasitization patterns of the highly invasive round goby (neogobius melanostomus) in the rivers rhine and main in germany. a total of 350 n. melanostomus were sampled between june and october 2011. gut content analysis revealed a broad prey sp ... | 2014 | 25338158 |
| morphological and genetic characteristics of the anisakid nematode raphidascaris acus from the southwest caspian sea: evidence for the existence of sibling species within a species complex. | recently, it has been shown that many nematode species are in fact species complex, using exact morphological and genetic studies. in this case, there are no such studies related to the genus raphidascaris railliet & henry, 1915. herein, the morphological and genetic variations among the iranian population of the species raphidascaris acus (bloch, 1779) railliet & henry, 1915 and the other allopatric populations with morphological and genetic information were compared to show whether this specie ... | 2014 | 24980652 |
| complex interaction between proliferative kidney disease, water temperature and concurrent nematode infection in brown trout. | proliferative kidney disease (pkd) is a temperature-dependent disease caused by the myxozoan tetracapsuloides bryosalmonae. it is an emerging threat to wild brown trout salmo trutta fario populations in switzerland. here we examined (1) how pkd prevalence and pathology in young-of-the-year (yoy) brown trout relate to water temperature, (2) whether wild brown trout can completely recover from t. bryosalmonae-induced renal lesions and eliminate t. bryosalmonae over the winter months, and (3) wheth ... | 2013 | 23670077 |
| correlation of parasites with growth of yellow perch. | the possible influence of parasites on the short-term and long-term growth and condition of yellow perch perca flavescens was examined by investigating correlations between parasite abundance and specific growth variables. the following parasites were enumerated in age-1 yellow perch collected from lake st. pierre in june 2008: apophallus brevis, diplostomum spp., ichthyocotylurus spp., tylodelphys scheuringi, phyllodistomum superbum, and raphidascaris acus. short-term growth was estimated using ... | 2012 | 22838080 |