Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 8203
Title: Gill ATPase activity related to parr-smolt transformation and migration in steelhead trout (Salmo gairdneri):  influence of photoperiod and temperature
Author: Waldo S. Zaugg, H. H. Wagner
Publication Year: 1973
Journal: Comparative Biochemistry and Physiology Part B: Comparative Biochemistry
Volume: 46
Issue: 4
Pages: 955-965
  1. Photoperiod schedules were used to control the onset of parr–smolt transformation in steelhead trout (Salmo gairdneri).
  2. Gill Na+–K+–stimulated ATPase activity was elevated in smolts exhibiting migratory behavior.
  3. ATPase activity was decreased and migration reduced when animals were subjected to temperatures of about 13°C or greater, or when the length of increasing photoperiods approximated that of the summer solstice (22 June).
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