In this study, heritability was estimated for total weight at 2 -3 and 4 -5 months after hatching. Estimation was made on data from 71 and 66 full-sib families (2-3 and 3-4 months of age). The analysis of variance was performed using a mixed linear animal model and variance components were analyzed following an animal model using Restricted Maximum Likelihood procedure (REML) employing average information (AI) algorithm. Heritability estimates (h2) for growth related traits varied considerably with ages. At 2-3 months old, h2 for body weight (BW;0.02?0.06) were low. At 4-5 months old, h2 of BW (BW; 0.16 ? 0.04) were higher than those estimated at 2-3 months old.
Response to selection (R), by different between least square mean of selected line and control line is
g./generation as 11.78 %. It was showed highly significant (p<0.01) and good trend by EBV selection.
For molecular level that involving growth, 50 fished of control and treatment groups were sampled for 2 sizes; large and small. It was resulted that the large size of control group showed the highest of average values of weight, length and body thickness. While average body depth of large size fishes of both control and treatment groups showed higher value than the small groups. For blood parameter, hematocrit of all groups showed no different. For growth gene, GHR-1 in muscle of treatment large group showed higher than the small group. Therefore GHR-1 in muscle may be involved in the selective breeding program of this project.