A STUDY ON LENGTH WEIGHT RELATIONSHIP OF FISH Channa punctatus (BLOCH) FROM THE RIVER GADADHAR AT COOCHBEHAR DISTRICT, WEST BENGAL, INDIA

The present study was aimed to describe the length weight relationship and condition factor of a study on Length weight Relationship of Channa punctatus (Bloch) [1] from the Gadadhar river at Coochbehar District, West Bengal, India. In this study, a total of 25 fish specimen comprises of Channa punctatus ranged from 9.3 cm to 14.2 cm in length and 5.12 gm to 19.3 gm in weight were studied. The entire length weight data were analyzed by least square method. The corresponding parabolic representation is w=0.0086413L2.90374 The computed b value (b=2.90374) of the species is not significantly different from the expected value '3' and hence the cube law W=aLb hold good in the case of Channa punctatus. In the species, there is a strong positive relationship between length and weight. The sampling areas were chosen to be spatially and geographically diverse, as well as to have varying environmental conditions. A true relationship was observed between an animal's length and weight. In general, fishes' growth patterns follow the cube laws. When the growth of the fish is isometric, such a relationship will be valid. The value of condition factor (K) was found to be more than 1* in the population of the fish indicated good condition of fish in the Gadadhar river, WestBengal, India (K=1.00308).