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In this study the structure of the Danube crayfish (Astacus leptodactylus) population from Ţaga Mare Lake, Cluj County was analyzed. According to the study results, three age categories (2+, 3+ and 4+) were identified for the Danube crayfish specimens. Numerically, females are more numerous than males, the sex ratio between males and females being as follows: SR2 + = 0.33; SR3 + = 0.33; SR4 + = 0.86. In terms of body size, males are better developed, except for their abdominal segments, wheredoi:10.15835/buasvmcn-asb:11455 fatcat:alx3r5swn5aqxoeq6q623dezyq