Abstract
1. 1. DDT inhibited activity of Na-K-ATPase and Mg-ATPase in gills of rainbow trout ( Salmo gairdneri) adapted to fresh water (FW), 1 3 sea water ( 1 3 SW) and SW. 2. 2. A negative correlation was found between gill Na-K-ATPase (decrease) and serum sodium (increase) in treated fish in SW. 3. 3. Enzyme activity was inhibited in FW fish, but no osmoregulatory impairment was found. This may indicate a minor or nonexistent role for gill Na-KATPase in FW osmoregulation. 4. 4. Enzyme activity was inhibited in trout acclimated to SW (SW > 1 3 SW > FW).
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