Population structure of Spanish mackerelScomberomorus commerson(Lacepede 1800) in the Northern Indian Ocean determined using microatellite markers

Abstract

Narrow barred Spanish mackerel,Scomberomorus commerson(Lacepede, 1800) is one of the economically important marine fish species in the Northern Indian Ocean. Genetic stock structuring is reported inS. commersonfrom Arabian Peninsula, Indo-West Pacific, Northern Australian, Southeast Asia and Northern Australia. The present study utilized microsatellite markers to elucidate the population structure ofS. commerson(Lacepede, 1800) in the Arabian Sea and Bay of Bengal. A total of 12 polymorphic microsatellite loci were amplified in 250 samples collected from five different geographic locations. LowFSTvalues (0.0023–0.027), AMOVA, PCoA and the Bayesian analysis of genetic structure indicated unit stock of the species in Indian waters. Bottleneck analysis using Wilcoxon signed rank tests and Mode shift test indicated lack of recent bottleneck events across populations ofS. commerson. The findings of the present study could be used in managing the commercially important species,S. commersonas a unit stock in Arabian Sea and Bay of Bengal of Northern Indian Ocean and reinforces the need for regional cooperation on fisheries management.