author(s)
Nandita Soni and NC Ujjania

abstract
The Indian major carp, Labeo rohtia (Ham. 1822) is the popular and commercially important freshwater fish. The objective of present study, elucidate the growth performance of fish and different growth parameters based on the scale analysis of rohu in Vallabhsagar reservoir. For this study about 662 fish scale samples were randomly collected from May 2013 to June 2014 and analysed which shows that these fishes containing 40.67-85.05 cm and 770-5591 gm back calculated length and weight respectively were directly proportionate to the age. The computation of growth parameter, annual length increment (H), annual weight increment (w), specific rate of linear growth-length (C_l), growth characteristic (C_th), Growth constant (C_lt) and specific rate of increase in weight (C_w) resulted inversely proportionate to the age of studied fish.The findings of the growth constant average (Clt_(av)) shows three life stages of fish in that one growth phase was before sexual maturity (0.25) and two growth phases were after sexual maturity (0.07 and 0.03). The study concluded that the growth of Labeo rohita was uniform and satisfactory in the reservoir due to the conducive aquatic environment and less rivalry for food and place in intra-species and inter-species.