On biology of reproduction of blue bream, Abramis ballerus (L., 1758), in the lower part of river Odra, Lake Dąbie and Szczecin Lagoon

Abstract

The present paper demonstrates results of examinations on seasonal course of gonads ripening, localisation of spawning places, spawning process, sex ratio in the spawning stock eggs diameter, as well as investigation on fecundity of blue bream. The spawning places being found out were situated in shallow, sheltered waters of canals of “Międzyodrze”.