Relationship between Na+,K+-ATPase activity and migration behaviour of brown trout and sea trout (Salmo trutta L.) during the smolting period
1998
Pirhonen, J. | Forsman, L.
Gill Na+,K+-ATPase activity was determined on three occasions (11 May, 30 May, 11 July) from PIT-tagged 2-year-old brown and sea trout (Salmo trutta), whose smolt migration was monitored in an annular flume tank. Of these three occasions, gill Na+,K+-ATPase activity was highest at the end of May coincidentally with the highest activity of downstream migration. Na+,K+-ATPase activity was significantly higher in brown trout than in sea trout in the end of May, but on the other two dates, there were no differences. There were no statistically significant correlations between the Na+,K+-ATPase activity and downstream migration at an individual level. The present result suggests that even if there is a general tendency for the elevation in gill Na+,K+-ATPase activity of two forms of S. trutta during the smolting period, this does not necessarily occur simultaneously with the changes in downstream migration behaviour at an individual level.
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