Research Article 

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

¹ Peninsular and Marine Fish Genetic Resources Centre, NBFGR, CMFRI Campus, Cochin, Kerala 682018, India
² Central Marine Fisheries Research Institute, Cochin, Kerala 682018, India

^* Corresponding author: divyanbfgr@gmail.com

Handling Editor: Carlos Saavedra

Received: 27 December 2017
Accepted: 2 July 2018

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 in S. commerson from Arabian Peninsula, Indo-West Pacific, Northern Australian, Southeast Asia and Northern Australia. The present study utilized microsatellite markers to elucidate the population structure of S. 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. Low F_ST values (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 of S. commerson. The findings of the present study could be used in managing the commercially important species, S. commerson as a unit stock in Arabian Sea and Bay of Bengal of Northern Indian Ocean and reinforces the need for regional cooperation on fisheries management.