NDLI: Population genetics of cobia (Rachycentron canadum) in the Gulf of Thailand and Andaman Sea: fisheries management implications

Content Provider	Springer Nature Link
Author	Phinchongsakuldit, Jaros Chaipakdee, Puangtip Collins, James F. Jaroensutasinee, Mullica Brookfield, John F. Y.
Copyright Year	2012
Abstract	Population genetics has been recognized as a key component of policy development for fisheries and conservation management and aquaculture development. This study aims to evaluate the genetic diversity and population structure of native cobia (Rachycentron canadum) in the Gulf of Thailand and Andaman Sea, establishing the existing population distributions and contributing information to aid in the development of policy, prior to extensive aquaculture development. Microsatellite analysis of natural cobia populations in these two ocean basins shows similar levels of gene diversity at 0.844 and 0.837, respectively. All populations and almost all microsatellite loci studied show significant heterozygote deficiency. Genetic differentiation between local populations is low and mostly not significant (R ST = −0.0109 to 0.0066). The population shows no marked structure over the long geographic barrier of the Thai–Malay peninsula, either when analyzed using pairwise genetic differences or evaluated without predefined populations using STRUCTURE. Additionally, a Mantel test shows no evidence of isolation by distance between the population samples. The significant heterozygote deficiency at most of the loci studied could be explained by the possibility of null alleles. Alternatively, given the behavior of forming small spawning aggregations, seasonal migration, and hitchhiking on large marine animals, the population genetics could be complex. The population of cobia at each location in Thai waters may be inbred, as a result of breeding between relatives, which would reduce heterozygosity relative to Hardy–Weinberg frequencies, while some of these populations could be making long distance migrations followed by admixture between resident and transient groups. This migration would cause population homogeneity in allele frequencies on a larger geographic scale. The results suggest that fisheries management for this species should be considered at both national and international levels, and until the possibility of local adaptation is fully investigated, policy development should apply the precautionary principle to ensure the preservation of genetic diversity and the sustainability of local and regional fisheries.
Starting Page	197
Ending Page	217
Page Count	21
File Format	PDF
ISSN	09676120
Journal	Aquaculture International
Volume Number	21
Issue Number	1
e-ISSN	1573143X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-06-02
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Rachycentron canadum Cobia Population genetics Gene flow Fishery management Freshwater & Marine Ecology Zoology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Agronomy and Crop Science

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