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Ceratomyxa shasta
''Ceratomyxa shasta'' is a myxosporean parasite that infects salmonid fish on the Pacific coast of North America. It was first observed at the Crystal Lake Hatchery, Shasta County, California, and has now been reported from Idaho, Oregon, Washington, British Columbia and Alaska (Bartholomew et al. 1989).
==Life history==
In addition to the fish host, ''C. shasta'' infects a freshwater polychaete worm (Bartholomew et al., 1997). Actinospores are released from the worm, and infect fish, on contact, in the water column. Neither horizontal (fish to fish), nor vertical (fish to egg) transmissions have been documented under laboratory conditions, suggesting that the worm host is necessary for completion of the life cycle.
Spores are released back into freshwater system after its fish host dies, however the complete life cycle, host and vector interaction is not fully understood (especially the ecology of the polychaete host).
Research indicates that the potential for infection is enhanced when water temperatures are high, water flow is low, or numbers of infectious ''C. shasta'' are relatively high. Infection rates appear to be higher in or below still water environments than riverine ones.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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