Morphology, Age and Growth of Grass Carp (Ctenopharyngodon idella) in Tudakul Reservoir of Uzbekistan

The study was carried out from November 2017 to October 2018 in Tudakul reservoir, Uzbekistan. A total 170 grass carps, Ctenopharyngodon idella, were sampled including 81 females and 89 males. Meristic and morphometric parameters were obtained from matured 20 males and 20 females separately. Scale of grass carp is cycloid, large, with straight edges. Annuli on scale of immature fish appeared in March and of mature fish appeared in May (during spawning period). The ages, total lengths and weights of the samples ranged between 1 to 5 years, 16 to 109 cm and 58 to 17000 g, respectively. The relation between total length (TL, cm) and weight (W, g) could be described by equation W=0.0153*TL2.9205 (r = 0.99). The relationship between total length (TL) and standard length (SL) could be described by linear equation: TL = 1.1231*SL+1.3462 (r = 0.99). Mean back calculated total length was at age I � 26.9 cm, II � 58.0 cm, III � 80.4, IV � 94.4 cm, V � 109.1 cm.