Genetic Diversity of Feral Populations of Nile Tilapia (Oreochromis niloticus) in Thailand and Evidence of Genetic Introgression

Authors

  • Srijanya Sukmanomon Program in Aquaculture, Graduate School, Kasetsart University, Bangkok 10900, Thailand.
  • Wansuk Senanan Department of Aquatic Science, Faculty of Science, Burapha University, Chon Buri 20131, Thailand.
  • Anne R. Kapuscinski Environmental Studies Program, Dartmouth College, Hanover, NH 03755, USA.
  • Uthairat Na-Nakorn Department of Aquaculture, Faculty of Fisheries, Kasetsart University, Bangkok 10900, Thailand.

Keywords:

feral populations, Oreochromis niloticus, genetic difference, introgression, Thailand

Abstract

The study aimed to understand the genetic diversity of Thai feral populations of Nile tilapia, Oreochromis niloticus, which make a substantial contribution to freshwater fi sh production in the country. The possible introgression from other tilapia populations/species was also investigated. Fourteen microsatellite primers were used to study three feral O. niloticus populations collected from reservoirs representing three types of habitats: 1) a wet-land (Sam Roi Yot, ON-SY); 2) a small reservoir (Bang Phra reservoir, ON-BP); and 3) a large reservoir (Bueng Boraphet, ON-BB). The results showed genetic variation that was high in ON-BP (Ar = 7.99, He = 0.75) and relatively low in ON-BB (Ar = 5.71, He = 0.62) and ON-SY (Ar = 5.78, He = 0.71). Genetic data were imported from two reference populations of O. niloticus [one population each from the Chitralada Villa Royal Residence, Thailand (ON-CD) and the genetically improved GIFT strain (ON-GIFT)] and one O. mossambicus population from South Africa for the model-based clustering analyses. ON-CD contributed to substantial portions of the gene pool of the feral populations. Genetic differentiation among the feral populations was signifi cant (P < 0.017, Bonferroni corrected). Introgression at the intraspecifi c level (from ON-GIFT to ON-BP and ON-BB) was observed while interspecifi c introgression between O. niloticus and O. mossambicus was apparent in ON-SY.

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Published

2012-04-30

How to Cite

Sukmanomon, Srijanya, Wansuk Senanan, Anne R. Kapuscinski, and Uthairat Na-Nakorn. 2012. “Genetic Diversity of Feral Populations of Nile Tilapia (Oreochromis Niloticus) in Thailand and Evidence of Genetic Introgression”. Agriculture and Natural Resources 46 (2). Bangkok, Thailand:200-216. https://li01.tci-thaijo.org/index.php/anres/article/view/242809.

Issue

Section

Research Article