DOI: 10.14798/72.1.702
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AGE AND GROWTH OF THE SILVER CARP (Hypophthalmichthys molitrix Val.) IN TUDAKUL RESERVOIR, UZBEKISTAN
2014, 72 (1) p. 12-16
Abstract
A study was carried out from November 2010 to October 2011 in Tudakul reservoir, Uzbekistan. A total of 142 silver carps, Hypophthalmichthys molitrix Val., were sampled including 65 females and 77 males. The scale of silver carp is cycloid with straight edges. Annulus on scale of immature silver carp appears in March and of matured fish during the spawning period in the second half of May. The ages, total lengths and weights of the samples ranged between 1 to 5 years, 15 to 105 cm and 35 to 17,500 g, respectively. The relation between the total length (TL) and weight (W) was described by equation W = 0.0065xTL3.1572 (r=0.99). The relationship between the total length (TL) and the standard length (l) was described by a linear equation: l = 0.8973xTL – 1.571 (r = 0.99). The mean estimated total length of 1-year-old silver carp was 25.25 cm; 2-year-old, 49.81 cm; 3-year-old, 68.91 cm; 4-year-old, 89.94 cm; 5-year-old, 94.47 cm. The mean back calculated total length was 28.2 cm at age I; 56.2 cm, II; 71.18 cm, III; 89.56 cm, IV; 98.9 cm, V. R. Lee’s phenomenon was not manifested as the fishing company is oriented to the catches of large fish.
Keywords
growth, back calculation, age estimation, hypophthalmichthys molitrix, silver carp