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Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Genetic diversity and structure in Arapaima gigas populations from Amazon and Araguaia-Tocantins river basins
Author(s): Torati, Lucas Simon
Taggart, John Bernard
Varela, Eduardo Sousa
Araripe, Juliana
Wehner, Stefanie
Migaud, Hervé
Keywords: Aquaculture
Issue Date: 28-Jan-2019
Date Deposited: 30-Jan-2019
Citation: Torati LS, Taggart JB, Varela ES, Araripe J, Wehner S & Migaud H (2019) Genetic diversity and structure in Arapaima gigas populations from Amazon and Araguaia-Tocantins river basins. BMC Genetics, 20 (1), Art. No.: 13.
Abstract: Background Arapaima gigas (Schinz, 1822) is the largest freshwater scaled fish in the world, and an emerging species for tropical aquaculture development. Conservation of the species, and the expansion of aquaculture requires the development of genetic tools to study polymorphism, differentiation, and stock structure. This study aimed to investigate genomic polymorphism through ddRAD sequencing, in order to identify a panel of single nucleotide polymorphisms (SNPs) and to simultaneously assess genetic diversity and structure in wild (from rivers Amazon, Solimões, Tocantins and Araguaia) and captive populations. Results Compared to many other teleosts, the degree of polymorphism in A. gigas was low with only 2.3% of identified RAD-tags (135 bases long) containing SNPs. A panel of 393 informative SNPs was identified and screened across the five populations. Higher genetic diversity indices (number of polymorphic loci and private alleles, Shannon’s Index and HO) were found in populations from the Amazon and Solimões, intermediate levels in Tocantins and Captive, and very low levels in the Araguaia population. These results likely reflect larger population sizes from less urbanized environments in the Amazon basin compared to Araguaia. Populations were significantly differentiated with pairwise FST values ranging from 0.086 (Amazon × Solimões) to 0.556 (Amazon × Araguaia). Mean pairwise relatedness among individuals was significant in all populations (P 
DOI Link: 10.1186/s12863-018-0711-y
Rights: © The Author(s). 2019 This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver ( applies to the data made available in this article, unless otherwise stated.
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