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Fig. 3


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Frequencies of ascending yellow eels according to size classes (a) and hour of detection (b). H50 indicates the hour of detection of 50% (median) of the eels; A, B and C specify detection stations at the first upstream detection station A (Monsin) in the Meuse, B (Yvoz-Ramet) on route 1 in the upper Meuse, and C (Angleur) on route 2 in the Ourthe tributary. Numbers in brackets indicate the sample size of eels detected by size classes and stations A, B and C, respectively. Du and Dar correspond to dusk and dawn, respectively.

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