Danube Crayfish Astacus leptodactylus (Eschscholtz, 1823) from Ţaga Mare Lake - Size and Population Structure

Cocan Daniel, Iulius Rotar, Luisa Andronie, Octavian Negrea, Călin Lațiu, Radu Constantinescu, Camelia Răducu, Miresan Vioara

Abstract


Abstract

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, where females are better developed due to the female reproductive function.


Keywords


Astacus leptodactylus, morphometry, population structureAstacus leptodactylus, morphometry, population structure

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DOI: http://dx.doi.org/10.15835/buasvmcn-asb:11455




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