Abstract
The time and size at which wild juvenile spring chinook salmon Oncorhynchus tshawytscha enter the sea has been estimated by analysis of scales from returning adult spring chinook salmon. Most juveniles entered the sea in September and October at a size of about 10 cm. Peak activity of gill (Na+K)-ATPase (adenosine triphosphatase) in wild spring chinook salmon juveniles held in captivity occurred in mid-September or October. Maximum changes in activity from September to October occurred in fish 10–12 cm fork length. The correlation between the timing of peaks in gill (Na+K)-ATPase activity and that of entry into the ocean suggests that wild juveniles enter the ocean when their osmoregulatory abilities are at a maximum.
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