Author(s): Abdullo R Kurbanov, Bakhtiyar G Kamilov

Abstract: A study was carried out from November 2010 to October 2011 in Tudakul reservoir, Uzbekistan. A total of 126 bighead carps, Hypophthalmichthys nobilis R., were sampled including 57 females and 69 males. The scale of bighead carp is cycloid with straight edges. Annulus on scale of immature bighead carp appear in March and of matured fish during the spawning period in second half of May-early June. The ages, total lengths and weights of the samples ranged between 1 to 4 years, 17 to 112 cm and 60 to 18000 g, respectively. The relation between the total length (TL) and weight (W) was described by equation W = 0.0105*TL3.067 (r = 0.99). The relationship between the total length (TL) and the standard length (SL) was described by linear equation: SL = 0.872*TL (r = 0.99). The mean estimated total length of 1-year-old bighead carp was 27.1 cm; 2-years-old, 51, 7 cm; 3-years-old, 84, 4 cm; 4-years-old, 89.8 cm. The mean back calculated total length was 26.5 cm at age I; 55, 4 cm, II; 82, 2 cm, III; 89.8 cm, IV. R. Lee’s phenomenon was not manifested as the fishing company is oriented to the catches of large fish.

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