Summary from the online OIE Diagnostic Manual
Ceratomyxosis is caused by the myxosporean Ceratomyxa shasta and is an important pathogen of salmonids on the Pacific northwest coast of North America. It can cause serious losses in both cultured juvenile fish and wild prespawning adult fish, although different strains of the same species may vary in their susceptibility to the disease. C. shasta infects all layers of intestinal tissue while susceptible species of anadromous salmonids are in their freshwater stage. Other infected tissues can be gill capillaries, spleen, kidney, gonads and liver. Exposure to contaminated sediments or water can induce infection at temperatures higher than 10°C. Clinical signs vary depending on the species but general external symptoms include anorexia, lethargy, ascites and exopthalmia. Internally the intestinal tract can become haemorrhaged with mucoid contents. The most effective control measure is avoidance of water supplies containing the infective stage or the introduction of resistant salmonids.
Countries affected
Country |
Year |
Status |
View Records |
Species affected
Species |
Disease occurence |
Abstract |
Countries affected
Species affected
Species |
Disease occurence |
Abstract |
Oncorhynchus gorbuscha
|
Natural occurrence
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Ceratomyxa shasta, a myxosporean parasite of salmonids.
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Oncorhynchus keta
|
Natural occurrence
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Ceratomyxa shasta, a myxosporean parasite of salmonids.
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Oncorhynchus kisutch
|
Natural occurrence
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Ceratomyxa shasta, a myxosporean parasite of salmonids.
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Oncorhynchus mykiss
|
Natural occurrence
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Ceratomyxa shasta, a myxosporean parasite of salmonids.
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Oncorhynchus nerka
|
Natural occurrence
|
Ceratomyxa shasta, a myxosporean parasite of salmonids.
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Oncorhynchus tshawytscha
|
Natural occurrence
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Ceratomyxa shasta, a myxosporean parasite of salmonids.
|
Salmo clarki
|
Natural occurrence
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Ceratomyxa shasta, a myxosporean parasite of salmonids.
|
Salmo salar
|
Natural occurrence
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Ceratomyxa shasta, a myxosporean parasite of salmonids.
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Salmo trutta
|
Natural occurrence
|
Ceratomyxa shasta, a myxosporean parasite of salmonids.
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Salvelinus fontinalis
|
Natural occurrence
|
Ceratomyxa shasta, a myxosporean parasite of salmonids.
|
Countries affected
Species affected
Species |
Disease occurence |
Abstract |
Oncorhynchus gorbuscha
|
Natural occurrence
|
Ceratomyxa shasta, a myxosporean parasite of salmonids.
|
Oncorhynchus keta
|
Natural occurrence
|
Ceratomyxa shasta, a myxosporean parasite of salmonids.
|
Oncorhynchus keta
|
Natural occurrence
|
World Animal Health in 1994. Part 2. Tables on the animal health status and disease control methods.
|
Oncorhynchus kisutch
|
Natural occurrence
|
Ceratomyxa shasta, a myxosporean parasite of salmonids.
|
Oncorhynchus mykiss
|
Natural occurrence
|
Ceratomyxa shasta, a myxosporean parasite of salmonids.
|
Oncorhynchus nerka
|
Natural occurrence
|
Ceratomyxa shasta, a myxosporean parasite of salmonids.
|
Oncorhynchus tshawytscha
|
Natural occurrence
|
Ceratomyxa shasta, a myxosporean parasite of salmonids.
|
Salmo clarki
|
Natural occurrence
|
Ceratomyxa shasta, a myxosporean parasite of salmonids.
|
Salmo salar
|
Natural occurrence
|
Ceratomyxa shasta, a myxosporean parasite of salmonids.
|
Salmo trutta
|
Natural occurrence
|
Ceratomyxa shasta, a myxosporean parasite of salmonids.
|
Salvelinus fontinalis
|
Natural occurrence
|
Ceratomyxa shasta, a myxosporean parasite of salmonids.
|