Elimination of fish-taste spoiling materials from Danube-water to be used for pond filling [rivers, fish ponds, water pollution, pollution control, fishery production, Hungary]

alimentos animal animal aquatique animales animals aquatic animals aquatic organisms eastern europe estanques europa europa oriental europe europe orientale fish ponds fishery production fishes foods freshwater fishes hongrie hungary hungria inland waterways organisme aquatique peces peces de agua dulce physiographic features poisson d'eau douce pollution pollution control pollution de l'eau ponds production production halieutique produit alimentaire rivers transport transporte vertebrados vertebrates vertebre water pollution