Abstract
1. Evidence of a size-related influence on sea-water adaptation in salmonids has led to a concern that acid exposure prior to entry into sea-water may further influence the sea-water adaptability of smaller fish. 2. Coho salmon smolts ( Oncorhynchus kisutch) were exposed to acidified soft waters for up to three weeks. 3. Subsamples of these fish were subjected to a sea-water challenge test after 1, 2 or 3 weeks. 4. Larger fish were found to tolerate longer periods of acid exposure. This size-dependent survival of larger fish was further influenced as fish were subjected to a sea-water challenge test. 5. Ion regulatory mechanisms were also shown to be related to size and duration of acid exposure.
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