Fecundity of the narrow-clawed crayfish Pontastacus leptodactylus in the water bodies of Belarus

Pre-larvae hatching fecundity and ovarian of narrow-clawed crayfish populations were estimated in the lakes reservoirs Belarus. Statistically significant differences females from various water bodies noted only for Lake Kichino. For all other bodies, dependence on length did not differ statistically was described by one equation. The greatest loss eggs during spawning period (oviposition), insemination attachment to pleopods female. During this short (2–3 hours), egg mortality 120 mm TL is 30 %, it decreases small increases large ones. gestation period, averages 8 %.