Heterogeneity in Development of the Ovaries of Bleak, <i>Alburnus Alburnus</i> (L.) in Lake Kortowskie in North-Eastern Poland

Abstract

Bleak ovaries during the period preceding the reproduction and during reproduction in Lake Kortowskie were studied as concerns reproductive diversity applying standard histological methods. Among 90 females, 88 represented batch spawning while 2 females the total spawning. Presence of female total spawners suggests that sexual maturity can occur in case of the crossbreeds of bleak with one of the total spawner species crossing with bleak.