Morphometric and Biometric Index Study of Channa Punctatus (Bloch) from Paddy Field of Sivsagar District, Assam

I n mo r ph o metr y o f Ch an n a pu n ctatu s , the total length was recorded as 9.1cm to 16.3cm whereas total body weight ranged from 11.15g to 43.02g. The mean value of standard length in percentage of total length was found to be 84.25 and head length was found to be 29.6. Mean value of body depth expressed as percentage of total length was 17.6; head depth was 2cm and was calculated to be 15.14; girth length was found as 52.99; dorsal fin length was found to be 10.6 while the mean value of eye diameter in percentage of head length was 12.53. Mean biometric index reveals that growth of head length (HL) in relation to total length (TL) is isometric or having maintained an almost constant biometric index with the increase of length. The growth of head depth (HD) also shows more or less isometric growth. The other parameters such as standard length (SL), body depth (BD), girth length (GL) and eye-diameter (ED), show allometric growth and ratios are not constant with the increase of length. The growth of body depth (BD), girth length (GL), and dorsal fin height shows positive allometry in relation to total length while, eye diameter (ED) in relation to head length (HL) also shows a positive allometry. Again, head length (HL) in relation to total length exhibits negative allometry. The regression coefficient (‘b’) and coefficient of correlation (‘r’) value for various morphometric parameters of the Channa punctatus were studied.