BIOMETRICS OF THE MULLET, RHINOMUGIL CORSULA (HAMILTON, 1822) FROM LOWER REACHES OF BRAHMAPUTRA RIVER, ASSAM

BIOMETRICS OF THE MULLET, RHINOMUGIL CORSULA

(HAMILTON, 1822) FROM LOWER REACHES OF

BRAHMAPUTRA RIVER, ASSAM

Authors:

*Jugabrat Das and Dhiraj Kr Borah

Abstract

This study presents the first assessment of biometrics for Rhinomugil corsula (Hamilton, 1822) from the

Brahmaputra River in Assam, India. Total length (TL) of the species ranged from 9.5–21.5 cm (Mean

12.53 ± 2.15), while body weight ranged from 6.97–84.43 g (Mean 16.12 ± 3.58). For all length

measurements, growth type was negative (-ve) allometric (b<3). Co-efficient of determination (r2) was

found as 2.695, 2.757 and 2.787 for Total Length (TL), Standard Length (SL) and Fork Length (FL)

respectively. Total length-body weight relationship was observed as BW=0.016TL2.695, Standard lengthbody

weight relationship as BW=0.024SL2.757 and Fork length-body weight as BW=0.015FL2.787. The

correlation co-efficient are recorded between 0.633 and 0.995. There was a positive relationship observed

between all the length parameters. The findings will help the fishery biologists, managers and

conservationists to initiate management strategies and regulations for the sustainable conservation of this

species in Brahmaputra River ecosystem.