Abstract
Seawater adaptability of wild pink salmon, Oncorhynchus gorbuscha, alevins was investigated using 96 h LC50 test, muscle sodium level and weight loss tests. Five temperature (2, 6, 9, 13 and 16°C) and two yolk groups were analysed during the beginning, the middle and the end of downstream migration. Both temperature and amount of residual yolk affected seawater adaptability. The computation of muscle sodium levels and weight loss after a short term (3–12 h) seawater challenge test may be a convenient method to estimate the seawater adaptability of fish too small to allow analysis of blood sodium concentration.
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