Genotype by environment interaction for adult body weights of shrimp Penaeus vannamei when grown at low and high densitie

Genetics Selection Evolution

Thomas R Famula¹  Ana M Ibarra² 

[1] Department of Animal Science, University of California Davis, 1 Shields Avenue, Davis, CA 95616, USA;Aquaculture Genetics and Breeding Laboratory, Centro de Investigaciones Biológicas del Noroeste S.C., Mar Bermejo 195, La Paz B.C.S. 23090, Mexico

关键词: genotype by environment interaction;    density;    body weight;    heritability;    Litopenaeus;   

Others  :  1093824
DOI  :  10.1186/1297-9686-40-5-541

 received in 2007-06-14, accepted in 2008-04-01,  发布年份 2008

【 摘 要 】

Shrimp is one of few marine species cultured worldwide for which several selective breeding programs are being conducted. One environmental factor that can affect the response to selection in breeding programs is the density at which the shrimp are cultured (low-medium-high). Phenotypic plasticity in the growth response to different densities might be accompanied by a significant genotype by environment interaction, evidenced by a change in heritabilities between environments and by a genetic correlation less than one for a unique trait between environments. Our goal was to understand whether different growth densities affect estimates of those genetic parameters for adult body weight (BW) in the Pacific white shrimp (Penaeus vannamei). BW heritabilities were significantly different between environments, with the largest at high density. These differences resulted from both an increased additive genetic variance and a decreased environmental variance when grown at high density. The genetic correlation between BWs at the two environmental conditions was significantly less than one. Whereas these results might be suggestive for carrying out shrimp selective breeding for BW under high density conditions, further understanding of genetic correlations between growth and reproductive traits within a given environment is necessary, as there are indications of reduced reproductive fitness for shrimp grown at high densities.

【 授权许可】

   
2008 INRA, EDP Sciences