Genotype-by-environment interaction in white shrimp associated with White Spot Disease

Abstract

This study aimed to estimate genotype-by-environment interaction for body weight (BW) and survival in presence and absence of White Spot Disease (WSD) in two genetic lines of Penaeus vannamei (Growth -GRO- and resistance to WSD -RES). Heritability for BW in the GRO line was 0.05 ± 0.16 in the presence of WSD and 0.35 ± 0.15 in the absence, while for the RES line they were 0.26 ± 0.07 and 0.49 ± 0.08  in the presence and absence of WSD, respectively. Genetic correlations for BW between environments were           -0.17 ± 0.60 for GRO and 0.89 ± 0.09 for RES. Heritability for survival in GRO was 0.01 in both environments and the genetic correlation was not estimable, whereas, for RES, the heritabilities were 0.06 ± 0.04 and 0.11 ± 0.06 in the absence  and presence of WSD, respectively, additionally, the genetic correlation was not significant. Although the linear model suggests a genotype-by-environment interaction, the estimates propose independence of the same trait between environments, and the correlations between traits in the resistance line propose to independently select traits when WSD is present.

http://dx.doi.org/10.21929/abavet2021.13            

e2020-95.