In this study, the reproduction biology of 172 prussian carp (Carassius gibelio (Bloch, 1782)) was studied from June 1999 to June 2000 monthly in Topçam Dam Lake. The sex and age composition of Prussian carp were determined. Individuals were composed of 1.16% males and 98.84 % females. In this study, specimens with fully mature were defined as those which were ready to reproduce at the third age. The spawning of prussian carp took place between March and August, and suggesting that it is a multiple spawner. The mean fecundity of prussian carp varies from 37823 (August) ? 85159 (March) for female monthly. The average egg diameter was between 0.533 (January) ? 1.099 (June) mm in months.

In this study, the reproduction biology of 172 prussian carp (Carassius gibelio (Bloch, 1782)) was studied from June 1999 to June 2000 monthly in Topçam Dam Lake. The sex and age composition of Prussian carp were determined. Individuals were composed of 1.16% males and 98.84 % females. In this study, specimens with fully mature were defined as those which were ready to reproduce at the third age. The spawning of prussian carp took place between March and August, and suggesting that it is a multiple spawner. The mean fecundity of prussian carp varies from 37823 (August) ? 85159 (March) for female monthly. The average egg diameter was between 0.533 (January) ? 1.099 (June) mm in months.