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This study was carried out with the aim of examining the seasonal fecundity and developmental characteristics of the eggs of the female narrow-clawed Crayfish (Astacus leptodactylus)from Aras Dam Lake, Western-Azerbaijanduring 2011. A positive correlation was found between both ovarian and pleopodal fecundity and female size. The mean value of ovarian eggs and Pleopodal fecundity was 206.55 and 129.5, respectively. Pleopodal fecundity was 37.3% lower than ovarian fecundity. The value of the gonadosomatic index (GSI) in females sampled on November was 13.53% (11.63 - 15.91%). The average size of pleopodal eggs diameter was 2.2 mm (1.07 - 6.59 mm). The number of eggs attached to 3rd and 4th pairs of pleopods was significantly higher than other pleopods. The egg number and gonadosomatic index increased significantly with female size (P<0.05). Histological analysis showed the ovarian oocytes of A.leptodactylus developed as asynchronous form.