Abstract
Lethrinus lentjan (Lacepède, 1802) is an important commercial species for marine fisheries in subtropical and tropical regions of the Indian and Indo-Pacific oceans. Although heavily exploited, their genetic diversity and population structuring along the Vietnam coastline are unclear. Here, we used a panel of single nucleotide polymorphisms (SNPs) generated from restriction site-associated DNA sequencing (RADseq). After removing 405 outlier loci, 1,506 putatively neutral SNPs from 62 individuals were used to assess the genetic population structure of L. lentjan. Observed/expected heterozygosity (Ho/He) within sites ranged from 0.170/0.202 (Southeast) to 0.188/0.213 (Central). Pairwise FST values, Structure and Discriminant Analysis of Principal Components (DAPC) analysis indicate the lack of spatial genetic structure, suggesting the presence of a single panmictic population. Larval dispersal by ocean currents may facilitated high gene flow of L. lentjan along the Vietnamese coastline, and Mekong River outflow may not act as the natural barrier.
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