Decreased stock entering the Belgian Meuse is associated with the loss of colonisation behaviour in yellow-phase European eels

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Fig. 4

D/T (a) and O/A indices (b) per size class of tagged yellow eels. The numbers in brackets show the sample sizes of eels detected and eels tagged for the D/T index, and the sample sizes of eels detected in the tagging year and eels detected after the tagging year for the O/A index.

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