Impact of the Wloclawek dam on migratory fish in the Vistula River [Poland]
2007
Bartel, R. | Wisniewolski, W. | Prus, P.,Inland Fisheries Institute, Zabieniec (Poland). Dept of River Fisheries
The decline of vimba, Vimba vimba (L.) and sea trout, Salmo trutta m. trutta L. populations in the Vistula River (Poland), following damming and the effectiveness of measures undertaken to counteract this and rebuild fish stocks, was analysed. The assessment of the fish pass at the Wloclawek Dam was done using both the conventional method of counting all the fish entering the fish pass and a new one based on data obtained with a special trap that permitted counting only the fish that had reached the top chamber of the fish pass. In order to minimize the negative effects of damming on the vimba population, the unconventional method of transporting spawners was applied in the 1970s and early 1980s. The results of this experiment are summarized in the present paper, and similar methods are proposed for the future restoration of the vimba population in the Vistula River. Restoration programs for salmon, Salmo salar L. sea trout, vimba, and sturgeon, Acipenser oxyrinchus Mitchill, are currently in development in Poland
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