Does selection in a challenging environment produce Nile tilapia genotypes that can thrive in a range of production systems?

Thoa Ngo Phu; Nguyen H Ninh; Wayne R Knibb; Nguyen Hong Nguyen

doi:10.1038/srep21486

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Does selection in a challenging environment produce Nile tilapia genotypes that can thrive in a range of production systems?

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Does selection in a challenging environment produce Nile tilapia genotypes that can thrive in a range of production systems?

Thoa Ngo Phu, Nguyen H Ninh, Wayne R Knibb and Nguyen Hong Nguyen

Scientific Reports, Vol.6, 21486

2016

DOI: https://doi.org/10.1038/srep21486

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Abstract

Nile tilapia

tilapia

trait expression

This study assessed whether selection for high growth in a challenging environment of medium salinity produces tilapia genotypes that perform well across different production environments. We estimated the genetic correlations between trait expressions in saline and freshwater using a strain of Nile tilapia selected for fast growth under salinity water of 15-20 ppt. We also estimated the heritability and genetic correlations for new traits of commercial importance (sexual maturity, feed conversion ratio, deformity and gill condition) in a full pedigree comprising 36,145 fish. The genetic correlations for the novel characters between the two environments were 0.78-0.99, suggesting that the effect of genotype by environment interaction was not biologically important. Across the environments, the heritability for body weight was moderate to high (0.32-0.62), indicating that this population will continue responding to future selection. The estimates of heritability for sexual maturity and survival were low but significant. The additive genetic components also exist for FCR, gill condition and deformity. Genetic correlations of harvest body weight with sexual maturity were positive and those between harvest body weight with FCR were negative. Our results indicate that the genetic line selected under a moderate saline water environment can be cultured successfully in freshwater systems.

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Title: Does selection in a challenging environment produce Nile tilapia genotypes that can thrive in a range of production systems?
Authors: Thoa Ngo Phu (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Nguyen H Ninh (Author) - Research Institute for Aquaculture, Vietnam
Wayne R Knibb (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Nguyen Hong Nguyen (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Publication details: Scientific Reports, Vol.6, 21486; 11
Publisher: Nature Publishing Group
Date published: 2016
DOI: 10.1038/srep21486
ISSN: 2045-2322
Copyright note: Copyright © 2016 The Authors. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering; Centre for Bioinnovation
Language: English
Record Identifier: 99449951802621
Output Type: Journal article

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Collaboration types: International collaboration
Web Of Science research areas: Fisheries