Abstract
1. 1. Increases and subsequent decreases in gill Na +-K + ATPase activity during parr-smolt transformation in coho salmon were accompanied by changes in blood nucleoside triphosphate (NTP) levels, hemoglobin concentrations and hematocrits. 2. 2. An advanced photoperiod schedule accelerated the parr-smolt transformation and the rate of changes in Na +-K + ATPase activity, NTP and hematocrit levels. 3. 3. Ratios of NTP:hematocrits and of NTP:hemoglobin increased during smoltification. 4. 4. Hematological changes suggest preparation for increased oxygen demand during migration and greater energy requirements by erythrocytes during smoltification and sea-water adaptation.
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