Studies on growth and mortality of Moustached Thryssa, Thryssa mystax (Schneider, 1801) along the Ratnagiri coast of Maharashtra, India

摘要

Growth and mortality parameters of Moustached Thryssa, Thryssa mystax were estimated on the basis of length frequency data collected during March 2015 to February 2016. The asymptotic length (L infinity) and growth coefficient (K) were estimated to be 224 mm and 1.0 per year respectively by ELEFAN and 243 mm and 1.0 per year respectively by scattergram. to by von Bertalanffy plot was estimated to be - 0.0036 year. This species attains a size of 83, 142, 174 and 194 mm at the end of six, twelve, eighteen and twenty four months respectively. Mortality parameters Z, M and F were estimated at 5.58, 1.03 and 4.55 respectively. Length at first capture for T. mystax was found to be 147.5 mm. The present exploitation ratio was determined to be 0.81. Relative yield per recruit analysis showed E-max. at 0.852.