Genotype-By-Environment Interaction In White Shrimp Associated With White Spot Disease

This study aimed to estimate the genotype-by-environment interaction for body weight (BW) and harvest survival (HS), in the presence and absence of White Spot Disease (WSD) in two genetic lines of Penaeus vannamei (Growth -GRO- and resistance to WSD-RES-). The 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 it was 0.26 +/- 0.07 and 0.49 +/- 0.08 in the presence and absence of WSD, respectively. The genetic correlations for BW between environments were -0.17 +/- 0.60 for GRO and 0.89 +/- 0.09 for RES. The heritability for HS in GRO was 0.01 in both environments and the genetic correlation was not estimable, while, 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 it was not significant. Although the linear model suggests a genotype-by-environment interaction, the estimates propose independence of the same characteristic between environments, and the correlations between characteristics for the resistance line propose to independently select the characteristics when WSD is present.