Correlated changes in body shape after five generations of selection to improve growth rate in a breeding program for Nile tilapia Oreochromis niloticus in Brazil

Carlos Antonio Lopes de Oliveira; Ricardo Pereira Ribeiro; Grazyella Massako Yoshida; Natali Miwa Kunita; Gabriel Soriani Rizzato; Shela Nogueira de Oliveira; Alexandra Ines dos Santos; Nguyen Hong Nguyen

doi:10.1007/s13353-016-0338-5

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Correlated changes in body shape after five generations of selection to improve growth rate in a breeding program for Nile tilapia Oreochromis niloticus in Brazil

Journal article

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Correlated changes in body shape after five generations of selection to improve growth rate in a breeding program for Nile tilapia Oreochromis niloticus in Brazil

Carlos Antonio Lopes de Oliveira, Ricardo Pereira Ribeiro, Grazyella Massako Yoshida, Natali Miwa Kunita, Gabriel Soriani Rizzato, Shela Nogueira de Oliveira, Alexandra Ines dos Santos and Nguyen Hong Nguyen

Journal of Applied Genetics, Vol.57(4), pp.487-493

2016

DOI: https://doi.org/10.1007/s13353-016-0338-5

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Abstract

heritability

genetic correlation

daily gain

rotund fish

body depth

Body shape is a commercial trait of great interest as it impacts profit and productivity of aquaculture enterprises. In the present study, we examined correlated changes in two measures of body shape (depth to length ratio, DL-R and ellipticity of mid sagittal plane, EL-H) from a selection program for high daily weight gain in a Nile tilapia population reared in freshwater cages in Brazil. Genetic parameters for body shape and its genetic association with growth traits (body weight and daily gain) were also estimated from 8,725 individuals with growth performance recorded over five generations from 2008 to 2013. Mixed model analysis showed that the selection program resulted in substantial improvement in growth performance (about 4 % genetic gain per generation or per year) and also brought about trivial changes in body shape. The heritabilities ranged from 0.470 to 0.564 for growth traits and 0.180 to 0.289 for body shape. The common family effects were low for all traits studied, accounting for only 3-11 % of total phenotypic variance. The genetic correlations between body shape and growth traits were weak, i.e., -0.385 between EL-H and growth traits and 0.28 between DL-R and body weight or daily gain. Strong and negative genetic association was found between the two body shape traits (rg = --0.955). Harvest body weight and daily gain are essentially the same traits, as indicated by the close to one genetic correlations between the two characters. Our results demonstrated that the selection process to increase growth rate had small, but slowly constant effect in body shape traits; and in the long term, the fish would have become rotund.

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Title: Correlated changes in body shape after five generations of selection to improve growth rate in a breeding program for Nile tilapia Oreochromis niloticus in Brazil
Authors: Carlos Antonio Lopes de Oliveira (Author) - Universidade Estadual de Maringa, Brazil
Ricardo Pereira Ribeiro (Author) - Universidade Estadual de Maringa, Brazil
Grazyella Massako Yoshida (Author) - Universidade Estadual Julio Mesquita Filho, Brazil
Natali Miwa Kunita (Author) - Aquaamerica Company, Brazil
Gabriel Soriani Rizzato (Author) - Aquaamerica Company, Brazil
Shela Nogueira de Oliveira (Author) - Universidade Federal da Grande Dourados, Brazil
Alexandra Ines dos Santos (Author) - Universidade Federal da Bahia, Brazil
Nguyen Hong Nguyen (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Publication details: Journal of Applied Genetics, Vol.57(4), pp.487-493
Publisher: Springer
Date published: 2016
DOI: 10.1007/s13353-016-0338-5
ISSN: 1234-1983
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: 99449916002621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Biotechnology & Applied Microbiology; Genetics & Heredity