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Effect of Bacterial Kidney Disease on Saltwater Adaptation of Coho Salmon Smolts
Author(s) -
Moles A.
Publication year - 1997
Publication title -
journal of aquatic animal health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 52
eISSN - 1548-8667
pISSN - 0899-7659
DOI - 10.1577/1548-8667(1997)009<0230:eobkdo>2.3.co;2
Subject(s) - biology , salinity , acclimatization , seawater , oncorhynchus , salmonidae , fishery , salt water , osmoregulation , fish <actinopterygii> , zoology , rainbow trout , ecology , environmental science , environmental engineering
Coho salmon Oncorhynchus kisutch with clinical infections of bacterial kidney disease (BKD) had poorer survival in the laboratory after 30 d in salt water (50%) than in freshwater (85%). Osmoregulatory ability of infected fish was better after acclimation in 10‰ salinity water before transfer to 30‰, salinity water. Infected fish exercised overnight (3.0 body lengths/s) were unable to survive the seawater challenge, whereas uninfected fish similarly exercised survived with the same plasma Na + levels as unexercised fish. Because BKD is present in most salmonid stocks, stress of seawater transfers should be minimized through acclimation and reduced exertion.