Papers

GROWTH STUDY OF AN EXOTIC FISH, RED PIRANHA (Pygocentrus nattereri) IN POLYCULTURE POND, BANGLADESH (Pages : 33 - 38)

M. M. RAHMAN, A. T. ABU AHMED, M. M. MAHMUD AND M. A. HOSSAIN

The growth in terms of length and weight of Red Piranha, Pygocentrus nattereri Kner, 1858 was studied in a polyculture pond at the Khaza Matshya Hatchery, Valuka, Mymensingh where the fish were cultured with different fish species, for a period of one year (August 2005 to July 2006). In the observed pond, the final overage weight and length of Piranha was 1102g and 39.1 cm respectively and the growth rate varied from 9.89% to 188.89%. Growth rate in terms of length and weight showed an increasing trend in February. The logarithmic from of equation obtained for the length weight relationship was represented by log W= -3.302+4.122 log (TL) 00 W= 0.00019889 (TL) 4.122 . The regression Co-efficient (b) and correlation co-efficient (r) was calculated as 4.122 and 0.985060 respectively. The values of relative condition factor (Kn) ranged from 0.60 to 1.70 with an average of 1.05. It was lowest in July and highest in January. The drop in the Kn value from April to July might be due to maturity of the fish. From the growth of the study, the growth rate of P. nattereri was found to be closely nearer (or higher in some case) to that of the other exotic species of fish. Download


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