A conference of the freshwater fish breeders was organized by the Institute for biology and pathology of the fish and bees of the Faculty of Veterinary Medicine, University of Zagreb and the Aquatika – freswater aquarium Karlovac on 10th November 2017. Professor Emil Gjurcevic lectured on sleeping disorders of carp, professor Krešimir Matanović on the application of disinfectants and antimicrobial drugs in freshwater fisheries, dr.sc. Mark Bodiš from Hungary on recirculation of zander. After the lecture, discussions on problems in fish breeding developed, and participants gave lecturers a large number of questions on which precise answers were received. The conference was completed with a joint aquarium visit.