Fishery, population dynamics and stock assessment of the spotted seer in gill net fishery at Veraval

Abstract

The fishery and population characteristics of Scomberomorus guttatus (Bloch & Schneider) from Veraval was studied for the
period 2003 – 2006. The average annual catch was 378 t, forming 14.4% of the total gill net catches at Veraval. The postmonsoon
and winter seasons (September to January) were the most productive seasons in terms of catch and catch rate. The
length–weight relationship showed that growth was isometric for the species. The von Bertalanffy growth equation was:
Lt = 61.27 [1 – e - 1.4 (t + 0.0046)] and length attained at the end of 1 and 2 years were 46.3 cm and 57.6 cm respectively. The
growth performance index was 3.721 and longevity was 2.138 years. Recruitment pattern was unimodal with peak recruitment
from February - July and the length at first capture was 21.1 cm. The natural mortality, fishing mortality and total mortality
were 1.79, 2.92 and 4.71, respectively and exploitation ratio was 0.62. The maximum sustainable yield was 305 t, which was
lower than the average annual catch indicating over-exploitation of the species. The yield per recruit and biomass per recruit
was 198.9 g and 66.9 g respectively. An increase in relative yield to 101.8% would be obtained by decreasing the present
level of fishing by 20%.