Studies on the sexualvariation in allometric condition of Indian major carp, labeo rohita (Hamilton)

Both male and female specimens of Labeo rohita ( body weight, 230-250 gm) have been assessed during monsoon period, 2011. This season is particularly chosen because both male and female fishes attain their sexual maturity as well as optimum growth. The study reveals that the values of gastrosomatic index (GSI), gonadosomatic index (GnSI), hepatosomatic index(HSI) and conditional factor (K) in male and female sexes were 0.5 and 0.7, 0.4 and 0.9, 0.9 and 1.0 and 1.4 and 1.8 respectively. In support of above index values and conditional factors, sexual variation during monsoon period have been observed to be high in female than male. Endeavors and achievements of this work show that the growth rate of both the sexes is proper and aquatic condition (pH,8.0, alkalinity,66.0mg/lit, free CO2 , 9.5mg/lit, dissolved O2 , 6.5mg/lit, total solid, 114.0mg/lit, total hardness,60.0mg/lit, total suspended solid, 4.0mg/lit, Chloride,10.6mg/lit) is favourable . Further female shows the faster growth than the male.