| chaetotaxy and armature of ichthyocotylurus erraticus (rudolphi, 1809) and i. variegatus (creplin, 1825) cercariae (digenea, strigeidae). | the armature and chaetotaxy of ichthyocotylurus erraticus (rudolphi 1809) and i. variegatus (creplin 1825) cercariae were studied using scanning electron microscopy (sem) and silver staining of the argentophilic sensilla. this represents the first detailed investigation of the surface structures of cercariae belonging to this genus. both species exhibited a similar armature, although differences were recorded in the number of spines comprising the pre-oral tuft and the number of rows of spines i ... | 1997 | 9000238 |
| helminth assemblages of whitefish (coregonus lavaretus) in interconnected lakes: similarity as a function of species specific parasites and geographical separation. | this article examined the composition of parasite assemblages of whitefish (coregonus lavaretus) in 8 interconnected lakes in northeastern finland and evaluated the role of coregonid specific parasites and the geographical distance between populations in determining the similarity of the assemblages. parasite assemblages were compared using the jaccard qualitative similarity index and a quantitative similarity index and by incorporating the allogenic-autogenic species concept and the effects of ... | 2004 | 15270087 |
| ichthyocotylurus erraticus (digenea: strigeidae): factors affecting infection intensity and the effects of infection on pollan ( coregonus autumnalis ), a glacial relict fish. | lough neagh pollan are heavily infected with the strigeid ichthyocotylurus erraticus , with 100% prevalence and median infection intensities of 600+ metacercariae in the pericardial cavity of mature fish. female fish were more heavily infected than males. infection intensity, which rose in summer, varied with pollan size, year, sampling bay within the lough and water depth within bays. heavily infected pollan were caught further offshore than lightly infected fish. spatial variation in pollan in ... | 2005 | 16174416 |
| host specificity and seasonality of helminth component communities in central european grebes (podicipediformes) and loons (gaviiformes). | structure and pattern of helminth component communities parasitizing grebes and loons are poorly understood. here we analyze the prevalence, intensity and diversity of helminths in 505 czech grebes (podiceps cristatus, podiceps nigricollis, tachybaptus ruficollis) and loons (gavia arctica, gavia stellata) collected between 1962 and 2014. the species richness of helminth component communities ranged from 31±8 (p. cristatus) to 50±4 (g. stellata) species, with helminth load similar in all five hos ... | 2015 | 26008120 |
| fatal ichthyocotylurus erraticus infestation in inca terns (larosterna inca) in a zoological collection. | in a breeding group of inca terns (larosterna inca), 14 birds died without antemortem signs of illness. other than a poor body condition and a bloody cloaca, no symptoms were observed. gross necropsy revealed severe segmental hemorrhagic enteritis with intralesional trematodes in most birds. histopathologic examination revealed infiltration of lymphocytes, plasma cells, and granulocytes in the lamina propria of the duodenum and cross-sections of trematodes in the lumen. the parasites were identi ... | 2014 | 25055645 |
| flavobacterium columnare: an important contributing factor to fish die-offs in southern lakes of saskatchewan, canada. | during june and july 2012, buffalo pound lake and blackstrap lake in saskatchewan, canada were visited biweekly and surveyed for sick and dying fish. during this investigation, 2 fish kills were identified. buffalo pound experienced a large die-off of yellow perch (perca flavascens) in june, while blackstrap experienced a die-off of lake whitefish (coregonus clupeaformis) in july. in excess of 50 fish were examined for gross lesions at each lake, and dead and moribund fish consistently had 1 or ... | 2014 | 25274742 |
| [intestinal digeneans of birds (superfamily diplostomoidea) of the masurian lakes]. | the aim of this study was to complete the information on digenean fauna of birds on the basis of the collection of diplostomid digeneans gathered in 1994-1970 during the field investigations directed by prof. wiśniewski in the region of masurian lakeland. | 2007 | 17912807 |
| histopathology, ultrastructure and immunohistochemistry of coregonus lavaretus hearts naturally infected with ichthyocotylurus erraticus (trematoda). | histopathological, ultrastructural and immunohistochemical investigations were conducted on 26 specimens of powan coregonus lavaretus (l.) from loch lomond (scotland). the hearts of all 26 powan (15 females and 11 males) investigated harboured metacercariae of the digenean trematode ichthyocotylurus erraticus (rudolphi, 1809). the vast majority of metacercariae were located either singly or as an aggregation of white cysts on the surface of the bulbus arteriosus. the intensity of infection range ... | 2005 | 16261940 |
| a molecular phylogeny of the genus ichthyocotylurus (digenea, strigeidae). | three nucleotide data sets, two nuclear (ribosomal internal transcribed spacer regions 1 and 2, its1 and its2) and one mitochondrial (cytochrome c oxidase subunit 1, co1), were analysed using distance matrix and maximum likelihood methods to determine the inter-relationships amongst the four species attributed to the genus ichthyocotylurus odening, 1969. sequence data obtained from all gene loci investigated supported the position of ichthyocotylurus variegatus as a species discrete from ichthyo ... | 2001 | 11403776 |
| cercarial emergence of ichthyocotylurus erraticus (rudolphi, 1809), i. variegatus (creplin, 1825) and apatemon gracilis (rudolphi, 1819) (digenea: strigeidae): contrasting responses to light:dark cycling. | many digenean cercariae have been shown to emerge from their molluscan hosts with distinct shedding patterns that have enabled the discrimination of morphologically similar species, or even strains. in this study the cercarial emission patterns of three strigeid species, ichthyocotylurus erraticus, i. variegatus and apatemon gracilis, from experimentally infected natural hosts were found to exhibit rhythms that correlated with the light:dark cycle. both ichthyocotylurus spp. exhibited a diurnal ... | 1999 | 10227056 |