Length-weight relationship and relative condition factor of Polynemus paradiseus (Linnaeus, 1758) from Hooghly-Matlah estuary, West Bengal
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Authors
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Nilamani Borah
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Sudhir Kumar Das
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Dibakar Bhakta
Abstract
The length-weight relationships (LWRs) and relative condition factor of Polynemus paradiseus (Linnaeus, 1758) were studied for 8 months
(December to next July) at selected stretches of Hooghly-Matlah estuary, West Bengal. A total of 260 specimens of P. paradiseus in the length range of 145 to
265 mm total length (TL) collected at fortnight intervals by traditional gears, viz., gillnets and stationary bag nets for the present study. The length-weight
relationship (LWR) was expressed as W = 0.00000392 L3.115 and W = 0.00000237 L3.182 for juveniles and adult groups, respectively which showed an isometric growth pattern. The correlation coefficient (r) for the LWRs was
estimated at 0.92 and 0.96 for juveniles and adult groups, indicating a high degree of correlation between the two parameters for both groups. Isometric growth pattern (b~3.0) was observed in P. paradiseus with size at first
mature at 145.0 mm total length. The ‘a’ values were observed as 0.00000392 and 0.00000237 and ‘b’ values as 3.115 and 3.182 for the juveniles and adult groups, respectively. The monthly mean relative condition factor (Kn) values varied from 1.002 to 1.177 and 0.986 to 1.239 for male and female specimens, respectively. The findings of the present study will provide baseline information
for the conservation and management, and as the basis for further studies of this fish species in Hooghly-Matlah estuarine waters of India.
Key words Polynemus paradiseus, isometric growth, Hooghly-Matlah estuary, India
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