REPRODUCTIVE BIOLOGY OF TAPPER TAIL ANCHOVY COILIA RAMCARATI ALONG THE COAST OF CHITTAGONG
Keywords:
Sex ratio, maturation, spawning, fecundityAbstract
A total of 754 male and 893 female samples of Coilia ramcarati (Hamilton 1822) were collected from commercial catches during the period from January 2010 to December 2010 from the coastal waters of Chittagong and Cox’s Bazar to study the reproduction of this species. The sex ratio disproportion between the 2 sexes ( 0.84:1.00 ) showed a dominance of females over the males. Well marked sexual dimorphism is observed; the gametes develop in the gonads of separate fish and fertilization is external in the water. Both male and female gonads undergo marked cyclic morphological changes before reaching full maturity and becoming ripe, as represented through the gonadosomatic index (GSI), hepatosomatic index, and Fulton’s Condition Factor values. The marked increase in the GSI demonstrated a prolonged spawning season extending from March to August. The fecundity of Coilia ramcarati in the present study ranged from 3129 to 16578 eggs with the mean of 7632.13 ± 3169.17. Linear positive relationships of fecundity with total length, body weight, gonad weight, and ova diameter were observed.
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