In order to obtain the heritability of growth traits in juvenile T.rubripes,and to exert the important role of heritability in guiding breeding work,the body mass,body length and total length of 2 900 juvenile T.rubripes at 1,2 and 4 months old were measured using the whole sib family of T.rubripes constructed in 2022.The heritability of these three growth traits was estimated by the whole sib correlation method and its formula.The phenotypic correlations among these three growth traits were calculated by Pearson coefficient.The genetic correlation of these three growth traits was calculated by sib covariance method.The results showed that the heritability of the 1-month-old juvenile T.rubripes was 0.54 (body mass heritability),0.39 (body length heritability) and 0.36 (full length heritability),respectively,all of which belonged to the high heritability.The genetic correlation between body length and body mass was 0.889 and the phenotypic correlation was 0.851.The genetic and phenotypic correlations of body mass were 0.873 and 0.864,respectively.The genetic correlation between body length and total length was 0.947 and the phenotypic correlation was 0.894.Heritability of body mass,body length and full-length at 2 months old were 0.28,0.23 and 0.25,respectively,all belonging to the medium heritability.The genetic correlation between body length and body mass was 0.828 and phenotypic correlation was 0.917.The genetic correlation and phenotypic correlation were 0.820 and 0.932,respectively.The genetic correlation between body length and total length was 0.897 and the phenotypic correlation was 0.952.At 4 months old,the heritability of body mass,body length and full length were 0.23,0.29 and 0.29,respectively,which belonged to the medium heritability.The genetic correlation between body length and body mass was 0.769,the phenotypic correlation was 0.779,the genetic correlation between body mass and body length was 0.726,and the phenotypic correlation was 0.801.The genetic and phenotypic correlations between body length and total length were 0.912 and 0.941,respectively.The results of this study can provide reference for the subsequent breeding of T.rubripes.