Heritability and genetic correlations for body weight at harvest size (BW), grow-out survival (SU), and log-transformed infectious hypodermal and hematopoietic necrosis virus (IHHNV) load (VL ln ) in Litopenaeus vannamei were estimated. Data were obtained in 2012 from a shrimp breeding population in Mexico using 12,440 shrimp for BW and 16,814shrimp for SU, and quantitative polymerase chain reaction determinations from 160 full-sib families were obtained for VL ln . DNA was extracted from pooled muscle samples of six shrimp per family for a total of 960 individuals. Heritability estimates for BW, SU, and VL ln at the family mean and at individual levels were 0.24 ± 0.08, 0.02 ± 0.01, 0.42 ± 0.45, and 0.08 ± 0.11, respectively. Genetic correlation estimates of BW with SU, BW with VL ln , and VL ln with SU were 0.40, −0.04, and −0.57, respectively. Our results suggest that VL ln has genetic variation and a favorable genetic association with BW † Deceased.
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