parvicapsula minibicornis n. sp. (myxozoa, myxosporea) from the kidney of sockeye salmon (oncorhynchus nerka) from british columbia, canada.a new species of myxosporea parvicapsula minibicornis is described from the kidney of adult sockeye salmon (oncorhynchus nerka) that had recently returned from the pacific ocean to weaver creek, a tributary of the fraser river, british columbia, canada. spores are ovoid, symmetrical, with 2 pyriform polar capsules at the anterior pole. the posterior pole has 2 small, pointed projections. mean spore dimensions are length 11.0 microm, thickness (perpendicular to suture plane) 6.8 microm, and width ...19979406793
renal infestation with parvicapsula minibicornis in wild sockeye salmon from the harrison and adams rivers in british columbia. 200010769771
distribution, prevalence and severity of parvicapsula minibicornis infections among anadromous salmonids in the fraser river, british columbia, canada.polymerase chain reaction (pcr) and microscopic examination of stained kidney sections were used to diagnose infections with the myxozoan parasite parvicapsula minibicornis in maturing fraser river salmon. in 2 series of collections, the parasite was detected in 109 of 406 migrating sockeye salmon oncorhynchus nerka belonging to early stuart, early summer and summer run-timing groups, mainly upper fraser river stocks. however, the parasite was detected neither in fish at sea nor once they had mi ...200312718470
parvicapsula minibicornis in anadromous sockeye (oncorhynchus nerka) and coho (oncorhynchus kisutch) salmon from tributaries of the columbia river.the myxosporean parasite parvicapsula minibicornis is described from adult sockeye and coho salmon during spawning migrations in tributaries of the columbia river in canada and the united states. these observations extend the known distribution of this parasite from the fraser river drainage basin. the parasite was identified in columbia river salmonids using polymerase chain reaction (pcr) and by in situ hybridization, but unlike in fraser river salmon, it was not observed in conventional histo ...200415357092
involvement of manayunkia speciosa (annelida: polychaeta: sabellidae) in the life cycle of parvicapsula minibicornis, a myxozoan parasite of pacific salmon.a coelomic myxozoan infection was detected in freshwater polychaetes, manayunkia speciosa from the klamath river, oregon/california, a site enzootic for the myxozoan parasites ceratomyxa shasta and parvicapsula minibicornis. the tetractinomyxon type actinospores had a near-spherical spore body 7.9 x 7.1 microm, with 3 spherical, protruding polar capsules, no valve cell processes, and a binucleate sporoplasm. parvicapsula minibicornis-specific primers parvi1f and parvi2r amplified dna from infect ...200616995391
longevity of ceratomyxa shasta and parvicapsula minibicornis actinospore infectivity in the klamath river.infectious ceratomyxa shasta and parvicapsula minibicornis actinospores were present in klamath river samples collected in april, may, and june 2005. juvenile chinook salmon oncorhynchus tshawytscha exposed to river water maintained at the ambient klamath river temperature for 0, 4, 24, 72, and 168 h (7 d) developed asymptomatic infections from both parasites. elevated water temperature (18 degrees c) in june may have reduced actinospore viability, as both c. shasta and p. minibicornis infection ...200718201047
distribution and abundance of the salmonid parasite parvicapsula minibicornis (myxozoa) in the klamath river basin (oregon-california, u.s.a.).the distribution and abundance of the myxosporean parasite parvicapsula minibicornis in the klamath river mirrored that of ceratomyxa shasta, with which it shares both its vertebrate and invertebrate host. assay of fish held at sentinel sites and water samples collected from those sites showed that parasite prevalence was highest below iron gate dam, which is the barrier to anadromous salmon passage. above this barrier parasite levels fluctuated, with the parasite detected in the free-flowing ri ...200718286810
development and validation of a quantitative pcr to detect parvicapsula minibicornis and comparison to histologically ranked infection of juvenile chinook salmon, oncorhynchus tshawytscha (walbaum), from the klamath river, usa.parvicapsula minibicornis is a myxosporean parasite that is associated with disease in pacific salmon during their freshwater life history phase. this study reports the development of a quantitative (real-time) polymerase chain reaction (qpcr) to detect p. minibicornis dna. the qpcr assay targets the 18s ribosomal subunit gene. a plasmid dna control was developed to calibrate cycle threshold (c(t)) score to plasmid molecular equivalent (pme) units, a measure of gene copy number. assay validation ...200919261045
development and application of a duplex qpcr for river water samples to monitor the myxozoan parasite parvicapsula minibicornis.a duplex quantitative polymerase chain reaction (qpcr) assay was developed to simultaneously quantify the myxozoan parasite parvicapsula minibicornis in river water samples and detect inhibition, which may compromise recognition of the target organism. the assay combines a taqman mgb probe specific to the nuclear small subunit ribosomal rna gene of p. minibicornis and a commercial taqman exogenous internal positive control. p. minibicornis is endemic to freshwaters of the pacific northwest of no ...200919899348
infection of gill and kidney of fraser river sockeye salmon, oncorhynchus nerka (walbaum), by parvicapsula minibicornis and its effect on host sockeye salmon, oncorhynchus nerka (walbaum), migrating upstream in the fraser river, british columbia, are exposed to the myxozoan parasite parvicapsula minibicornis when they enter the river from the ocean. infections are initially localized in the kidney but have recently been associated with branchitis in one population. adult fish from five locations in the watershed were sampled to determine whether branchitis was widespread. p. minibicornis infections in kidney glomeruli were preval ...201020626548
phylogenetic position of sphaerospora testicularis and latyspora scomberomori n. gen. n. sp. (myxozoa) within the marine urinary amendment of the family sinuolineidae (myxosporea) is proposed in order to include a newly described genus latyspora n. gen. the type species latyspora scomberomori n. gen. n. sp. is a coelozoic parasite in the kidney tubules of scomberomorus guttatus. in addition to the morphological and molecular characterization of l. scomberomori n. gen. n. sp., we also present novel ssu rdna data on sphaerospora testicularis, a serious parasite of dicentrarchus labrax. performed phylogenetic analyses rev ...201020946696
geographical and host distribution patterns of parvicapsula minibicornis (myxozoa) small subunit ribosomal rna genetic types.parvicapsula minibicornis is a myxozoan parasite implicated in mortalities of both juvenile and pre-spawning adult salmon in the pacific northwest of north america. disease severity and presentation varies between salmon species and geographical localities. to better characterize population structure of the parasite, we sought genetic markers in the p. minibicornis ribosomal rna gene. we compared samples from california with the type specimen from british columbia, identified sequence variations ...201121733258
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