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Fig. 4. Predicting migratory behaviour in wild brown trout in the mainstream (River
Lille Aa). Numbers of predicted (broken lines) and actual (solid lines) future
migrants and residents in the mainstream (River Lille Aa) as a function of
threshold probability of migration (or threshold gill
Na+/K+-ATPase activity), as predicted from the logistic
regression equation relating premigratory gill
Na+/K+-ATPase activity in mid-April and future migratory
behaviour of wild brown trout from the two tributaries (Haldum Brook and River
Granslev Aa).