Population dynamics of Puntius sophore (Hamilton, 1822) of river Sutlej in Punjab (India)

Abstract

Aim: The aim of the present paper was to describe first and comprehensive picture on length-weight relationship and population dynamics of riverine Puntius sophore. The findings of the investigation will be an imperative part of the ecological database from river Sutlej. Methodology: The length-frequency data of 579 specimens of P. sophore captured from different stretches of river Sutlej were collected fortnightly from Tajpur fish market and Haibowal fish market (Devnagar) during April 2019 to March 2020. All the population parameters were analyzed using FiSAT II analytical package developed by FAO. Results: The estimated length-weight relationships (LWRs) of combined male and female was derived as W=0.1471 L3.0605 (r=0.98). The growth parameters were L∞=123.5 mm, K=1.18 yr-1, to= -0.7672 yr-1, Rn=0.215 and ø'=4.241. The estimated natural mortality coefficient (1.25 per yr) was greater than fishing mortality (1.03 yr-1).The present level of exploitation (E=0.45, U=0.40) of P. sophore stock indicated that stocks were under-exploited. Prediction of maximum length from extreme values at 95% confidence interval was calculated as 112.48-138.24 mm. The recruitment pattern of P. sophore showed peaks during May and June. Interpretation: The P. sophore stock was under-exploited. The fishing intensity may be standardized to obtain optimum yield per recruit and thereby ideal maximum sustainable yield. This baseline information will help in further studies on the stock assessment and formulating strategies for rational exploitation of the species.