| Abstract: | We evaluated Renibacterium salmoninarum infection in smolts of hatchery and wild spring-summer chinook salmon Oncorhynchus tshawytscha sampled during most of the out-migration at Little Goose (1988) and Lower Granite dams (1988-1991) on the Snake River and at Priest Rapids and McNary dams on the Columbia River (1988-1990). We sampled 860-2,178 fish per dam each year. Homogenates of kidney-spleen tissue from all fish were tested for the presence of R. salmoninarum antigens by the enzyme-linked immunosorbent assay (ELISA), and homogenates from 10% of the fish were examined by the fluorescent antibody technique (FAT). Although only 1-11% of fish sampled at a given dam during any 1 year exhibited lesions characteristic of bacterial kidney disease, 86-100% of the fish tested positive for R. salmoninarum antigen by ELISA, whereas 4-17% of the fish tested positive by the FAT. During most years, a majority (68-87%) of fish testing positive by the ELISA had low R. salmoninarum antigen levels, but in 1989, 53% of positive fish from Lower Granite Dam and 52% from McNary Dam showed medium-to-high antigen levels. For most years, the highest mean antigen levels were measured in fish sampled after 75% of the total out-migrants had passed a given dam. When the largest numbers of fish were being collected for bypass or downriver transportation, mean antigen levels were relatively low. |
| Genre: | Article |
| ProdID: | 70019898 |
| Citation Author: | Elliott, D. G.; Pascho, R. J.; Jackson, L. M.; Matthews, G. M.; Harmon, J. R. |
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| Citation End Page: | 126 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Aquatic Animal Health |
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| Citation Number Of Pages: | 13 |
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| Citation Search Results Text: | Renibacterium salmoninarum in spring-summer chinook salmon smolts at dams on the Columbia and Snake Rivers; 1997; Article; Journal; Journal of Aquatic Animal Health; Elliott, D. G.; Pascho, R. J.; Jackson, L. M.; Matthews, G. M.; Harmon, J. R. |
| Citation Start Page: | 114 |
| Citation Volume: | 9 |
| Citation Year: | 1997 |
| Type: | citation/reference |
| Text: | Renibacterium salmoninarum in spring-summer chinook salmon smolts at dams on the Columbia and Snake Rivers; 1997; Article; Journal; Journal of Aquatic Animal Health; Elliott, D. G.; Pascho, R. J.; Jackson, L. M.; Matthews, G. M.; Harmon, J. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1997 00:00 -0600 |
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