Pattern of intrabasin variation in condition factor, relative condition factor and form factor of an Indian major carp, Labeo rohita (HamiltonBuchanan, 1822) in the Ganges basin, India

Abstract

To test intrabasin variation of the condition factor, relative condition factor and form factor of a commercially important Indian Major Carp Labeo rohita (Hamilton-Buchanan 1822), a total of 1183 individuals were sampled in six rivers of the Ganges basin from January 2009 to December 2011. Condition factor (K) for male populations ranged from 1.20±0.28 - 1.51±0.17 while, in female ranged from 1.26±0.17 - 1.40±0.36. Significant variation of K was significantly in male populations of all the rivers (p<0.05) while, it was not significant in females (p>0.05). The variation in K with total length of fish showed distinct pattern of alignment. Relative condition coefficient (K ) showed significant variations among different male populations and also with the n total length of L. rohita. The UPGMA was employed to detect the population groups in males and females, which resulted in generation of five clusters for both sexes in six populations. For detecting shape variations of fish among different populations form factor has been deduced. Form factor (a ) for males of six populations 3.0 ranged from 0.004808-0.005404 and 0.004819-0.008669 for female stocks of six different rivers.