Estimation of fecundity and gonado somatic index (GSI) to detect the peak-spawning season of dhela (Osteobrama cotio cotio)
2003
Hussain, L. | Alam, M.A. | Islam, M.S. | Bapary, M.A.J. (Bangladesh Agricultural Univ., Mymensingh (Bangladesh). Dept. of Fisheries Biology and Genetics)
Fecundity of 50 specimen of dhela Osteobrama cotio cotio was studied. The number of eggs varied from 512 (total length 2.20 cm and body weight 1.12 g) to 6849 (total length 5.7 cm and body weight 7.1 g). The mean fecundity was 3273 plus minus 1708 (mean body length 3.880 plus minus 1.216 cm and mean body weight 3.667 plus minus 1.82 g and gonad weight 0.605 plus minus 0.302 g). The fecundity was found to have a linear relation with body length, weight and gonad weight of fish and all these relationships were highly significant. The maximum GSI value (15.31) was found in the month of June, which indicated the period of maximum gonadal growth. A sharp drop in the GSI value (3.79) took place in September indicated the spawning occurred before September. However, the breeding season of dhela started in the monsoon month of early June and extended until September.
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