~ 807 ~ Journal of Entomology and Zoology Studies 2019; 7(1): 807-811 E-ISSN: 2320-7078 P-ISSN: 2349-6800 JEZS 2019; 7(2): 807-811 © 2019 JEZS Received: 18-01-2019 Accepted: 21-02-2019 Nandita Soni Department of Aquatic Biology, Veer Narmad South Gujarat University, Surat, Gujarat, India NC Ujjania Department of Aquatic Biology, Veer Narmad South Gujarat University, Surat, Gujarat, India Correspondence NC Ujjania Department of Aquatic Biology, Veer Narmad South Gujarat University, Surat, Gujarat, India Determination of scale based growth parameters of Labeo rohita (Ham. 1822) from Vallabhsagar Reservoir, Gujarat (India) 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 (Cl), growth characteristic (Cth), Growth constant (Clt) and specific rate of increase in weight (Cw) 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. Keywords: Rohu, age, growth parameters, scale, Vallabhsagar 1. Introduction Labeo rohita (Ham.1822) is locally known as rohu, rui or roho and inhabitant of inland water resources like rivers, canals, lakes etc. The fast growth, high market price, high people demand, survive in different habitats and herbivorous feeding habit are the important reasons for popularisation of the farming of rohu. The information on fish biology and ecological needs are the requirements to improve the carp culture [1-2] . Among the fish biological information, determination of age and growth parameters are the important scientific tool to know the age at first maturity, population dynamics, growth estimation and harvestable size of the fish [3-12] . Age of fish can analysed by several hard parts like scale, opercula, vertebrae, fine spines cleithrum and otolith but among these hard parts scales are widely use and suitable because it shows high degree of polymorphism in tropical environment [13-15] and clear seasonal growth rings are more prominent [16-18] . Age and growth of Indian major carps were investigated to resorting the scale studies [19-22] . Recently, Mir [2] , Ujjania [6] and Soni [12] studied the age and growth parameters of Indian major carps including rohu form six drainage of Ganga basin, different water bodies of southern Rajasthan and Vallabhsagar reservoir (Gujarat) respectively, Age and growth profile of Catla catla was reported from rivers of north India [16] , Cirrhinus mrigala from Rihand reservoir (UP) [23] , hill stream teleost from Srinagar (Uttharakhand) [24] , silver carp from Tudakul reservoir, Uzbekistan [25] and Cirrhinus mrigala from Pong reservoir (Himachal Pradesh) [26] . In the view of the importance of such biological parameters for fisheries management, the present investigation was undertaken for rohu from Vallabhsagar reservoir, Gujarat. 2. Materials and Methods 2.1 Study area Vallabhsagar reservoir is popularly known as Ukai dam and was constructed across Tapi river of Gujarat in 1971 on 73 0 32’25” to 78 0 36’30” E longitudes and 20 0 5’0” to 22 0 52’30” N latitudes (Fig. 1). The important morphometric features of the reservoir is including height 80.772 meters, length 4972 meters, water storage capacity 7414.29 Mm 3 , surface area 612 km 2 and catchment area is 62,255 km 2 .