| 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 ... | 2006 | 16995391 |
| distribution and habitat characteristics of manayunkia speciosa and infection prevalence with the parasite ceratomyxa shasta in the klamath river, oregon-california. | a survey for manayunkia speciosa, the freshwater polychaete host for the myxozoan parasite ceratomyxa shasta, was conducted from 2003 to 2005 as part of an integrated study of the epizootiology of ceratomyxosis in klamath river salmonids. substrata samples (n = 257) were collected in a variety of habitats from klamath lake to the mouth of the klamath river to document occurrence and relative abundance of the polychaete by habitat type and to estimate the prevalence of c. shasta within selected p ... | 2007 | 17436945 |
| 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 ... | 2007 | 18201047 |
| disparate infection patterns of ceratomyxa shasta (myxozoa) in rainbow trout (oncorhynchus mykiss) and chinook salmon (oncorhynchus tshawytscha) correlate with internal transcribed spacer-1 sequence variation in the parasite. | ceratomyxa shasta is a virulent myxosporean parasite of salmon and trout in the pacific northwest of north america. the parasite is endemic in the klamath river, oregon/california, where a series of dams prevent movement of fish hosts between the upper and lower parts of the basin. ceratomyxa shasta exhibits a range of infection patterns in different fish species above and below the dams. we hypothesised that the variations in infection and disease are indicators that different strains of the pa ... | 2010 | 19895812 |
| invasion of ceratomyxa shasta (myxozoa) and comparison of migration to the intestine between susceptible and resistant fish hosts. | the myxozoan parasite ceratomyxa shasta infects salmonids causing ceratomyxosis, a disease elicited by proliferation of the parasite in the intestine. this parasite is endemic to the pacific northwest of north america and salmon and trout strains from endemic river basins show increased resistance to the parasite. it has been suggested that these resistant fish (i) exclude the parasite at the site of invasion and/or (ii) prevent establishment in the intestine. using parasites pre-labeled with a ... | 2010 | 20385137 |
| mortality threshold for juvenile chinook salmon oncorhynchus tshawytscha in an epidemiological model of ceratomyxa shasta. | the myxozoan parasite ceratomyxa shasta is a significant pathogen of juvenile chinook salmon oncorhynchus tshawytscha in the klamath river, california, usa. this parasite requires 2 hosts to complete its life cycle: a freshwater polychaete (manayunkia speciosa) and a salmonid. the complex life cycle and large geographic area where infection occurs make it difficult to monitor and manage ceratomyxosis. we present a model for ceratomyxosis-induced mortality in o. tshawytscha, from which parameters ... | 2010 | 21290897 |