Length-Weight Relationship in Terms of Seasonal Variation of Carps from Kori Lake, Thatta Pakistan

Abstract

The Experimental fish samples were collected monthly during winter and summer from various fishermen of the Kori lake Thatta Sindh. A total number of 900 fishes (Labeo rohita. Cirrhinus mrigala, Cyprinus carpio, Catla catla and Labeo calbasu).These fishes ranged from 20.1-25 cm, 25.1-30cm, 30.1-35 cm, 35.1-40, 40.1-45 cm and 45.1-50 cm in TL respectively. The regression coefficient of length- weight relationship and condition factor of Labeo rohita, Cirrhinus mrigala, Cyprinus carpio, Catla catla and Labeo calbasu were Log W = -0.84+2.31 LogL and Log W= -0.28+2.01 LogL (Labeo rohita)  Log W = -1.02+2.39 LogL and Log W= -0.76+1.73 LogL (Cirrhinus mrigala) Log W = -0.97 +2.37 LogL  and Log W= -0.14+1.89 LogL  (Cyprinus carpio)  Log W = -0.92+2.33 LogL and Log W= -0.17+1.93LogL (Catla catla) Log W = -0.1.14+2.32 LogL and Log W= -0.68+2.21LogL (Labeo calbasu)

 The length weight relationship values indicated that growth of Labeo rohita, Cirrhinus mrigala, Cyprinus carpio, Catla catla and Labeo calbasu from Kori lake Thatta Sindh was found to be positive allometry and regression coefficient (b=2.31, 2.39, 2.37, 2.31 and 2.32 respectively) indicated as satisfactory growth of major carp Labeo rohita, Cirrhinus mrigala, Cyprinus carpio, Catla catla and Labeo calbasu from Kori lake Thatta Sindh.  The values of relative condition factor (Kn) was calculated for combined sexes for all the fish species found to be mean Kn = 1.06, 1.10, 1.05, 1.03, 1.04 in winter, 1.04, 1.03, 1.03, 1.04, and 1.05 during summer respectively.