Evaluation of reproductive parameters of males in wild freshwater crayfish (Astacus leptodactylus)

Abstract

The mature crayfish (A. leptodactylus) were caughted with pinter from Keban Dam Lake Koçkale hunting area at the breeding season. The
crayfish were stored for 20 minutes at 20°C and anesthetized. Carapace lengths were measured by caliper and their weights were weighed. Then
the crayfish were dissected and the carapace removed. Macroscopic observations were realized in the reproductive system. All reproductive
system, testes and the vasa deferans were weighed. The testicular index (TI) and gonado-somatic index (GSI) were calculated. The means of
TI and GSI was 0.27±0.17 and 1.66±0.99, respectively. Consequently, the present study would be useful for reproductive management and
efficiency.