Journal of the Marine Biological Association of India

Population dynamics of Johnieops vogleri (Bleeker) off Bombay waters

Volume 35 Issue 1&2

Sushant K Chakraboty

Abstract

Age and growth, mortality and stock assessment of Johnieops vogleri (Bleeker) based on the data collected from New Ferry Wharf landing centre of Greater Bombay from 1979-80 to 1984-85, is reported here. This species attains 143 mm, 227 mm and 277 mm at the end of first, second and third year respectively. The von Bertalanffy's growth parameters estimated were as follows : L_∞ =354 mm, K=0.5077 (annual), to=-0.02032 years and Woo=586 gm. Instantaneous rates of total, natural and fishing mortalities were estimated as Z=2.22, M=1.10 and F=1.12.

The present exploitation ratio (E) works out to be 0.50 and the exploitation rate GJ) is 0.42. The average standing stock is estimated to be 675.175 tonnes and total stock 1681.5581, whereas the annual average yield is 756.201. Maximum Sustainable Yield (MSY) was found to be 749.4441. The present investigation indicates that the stock of J.vogleri is optimally exploited and any further increase In the fishing efforts is not advisable.

Date : 31-10-1993