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Fig. 2. Premigratory gill Na+/K+-ATPase activity and future
migratory behaviour in wild brown trout from the mainstream (River Lille Aa)
in early April (88 future migrants and 16 future residents). The solid line
indicates the probability of future migration as a function of premigratory
gill Na+/K+-ATPase activity, as determined by logistic
regression analysis on mainstream data. For comparison, the broken line
indicates the logistic regression curve for mid-April in the tributaries.