Length-Weight relationships of Cyprinus carpio from the Indus River at Chashma Lake, District Mianwali, Punjab, Pakistan

Abstract

Length-weight relationships (LWRs) and relative condition factor are of great importance in fishery assessment studies since it provides information about the growth of all fishes. The objective of the present study was to develop the model for predicting length-weight relationship (LWR) length relationship (LLR) and condition factor (K) of Cyprinus carpio at Chashma Lake District Mianwali, Punjab, Pakistan. In January 2017, Samples of 43 fish’s range in size of 31.00 cm to 60.80 cm were taken to estimate the LWR and LLR. The length of the fish was ranged in size from 31.00 to 60.80 cm with a mean of 43.50 (± 1.98) in TL and from 25.00 to 50.00 cm with a mean range of 35.20 (± 1.87) in SL. The regressions result for LWR were found highly significant (r = 0.943; P < 0.001) with coefficients of determination, r2 = 0.889 showing a highly significant correlation between logs transformed data of TL and W. Slope value (b) of C. carpio was found 3.01, which is very close to 3.00, hence representing an isometric growth pattern. In LLR, the SL, BG, DFL, PvFL, and AFB were found isometric (b=1) with TL, HL, PtFL, PtFB, PvFB, AFL, CFL, and CFW showed negative allometric growth, while DFB showed positive allometric growth with TL in C. carpio. Condition factor (K) remained insignificant with TL and BW.