Affiliation: | Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Department Biology and Ecology of Fishes, POB 850 119, D-12561 Berlin, Germany;;Institute of Inland Fisheries, Jägerhof, D-14476 Gross-Glienicke, Germany;;Institute of Fisheries, State Research Centre Mecklenburg-Vorpommern, An der Jägerbäk 2, D-18069 Rostock, Germany |