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Grayling, Aesche, Ombre (Thymallus thymallus) Feeding on drift food in between water plants, Gacka River, Croatia Zwischen Wasserpflanzen antreibende Insektenlarven nehmend, Gacka, Kroatien Prenant nourriture derivante entre plantes aquatiques, riviere Gacka, Croatie 04-10-2007 (KEYSTONE/Michel Roggo)