Abstract:In the present study, a preliminary evaluation was conducted on the cold tolerance and growth traits of 69 Fenneropenaeus chinensis by indoor artificial cooling. A linear mixed model with average information restricted maximum likelihood was used to evaluate the genetic parameters. Two animal models were used to evaluate the heritability of body weight (BW) and body length (BL) under low-temperature stress in F. chinensis. The heritability of BW and BL observed in model 1 were (0.206±0.177) and (0.187±0.179), respectively, and for model 2, these were (0.317±0.065) and (0.298±0.063), respectively, which ranged between medium to low. The differences between the two models were tested by likelihood ratio test, and the likelihood ratio values for Model 1 and Model 2 were 1.640 and 1.764, respectively, which were not significantly different (P>0.05). The results showed that the two models were not significantly different, and that model 2 was the optimal model. The heritability of the survival status at half lethal time (SS50) among cold tolerant traits was (0.169±0.078). The phenotypic and genetic correlation coefficients between BW and BL under low-temperature stress were (0.823±0.010) and (0.969±0.018), respectively, which were relatively high. The phenotypic correlation coefficients between BW and SS50; and BL and SS50 were comparatively low with values (0.187±0.030) and (0.218±0.030), respectively. The genetic correlation coefficient between BW and SS50; and BL and SS50 were comparatively high with values (0.517±0.205) and (0.538±0.203), respectively. The results showed that during breeding of F. chinensis, the cold tolerant variety can be selected together with growth traits.
