In this study, shell length, shell width, shell height, apex height, and body weight of reciprocal hybrid abalone (Haliotis discus hannai ♀ × H. gigantea ♂ (DG) and H. gigantea ♀ × H. discus hannai ♂ (GD)) were measured, and the correlation coefficients were estimated. Path coefficients, determination coefficients, and correlation index were calculated. The results showed that phenotypic correlations between morphological traits and body weight in reciprocal hybrids were positive. The association of the morphological traits and body weight were found to be different in these 2 hybrid abalone. For DG, shell height was highly correlated with body weight among the 4 shell morphological traits, whereas shell width was highly correlated with body weight in GD. Multiple regression equations were obtained to estimate shell length, Χ;₁ (in millimeters); shell width, Χ;₂ (in millimeters); apex height, Χ;₃ (in millimeters); and shell height, Χ;₄ (in millimeters); against body weight, Y (in grams) of reciprocal hybrids (DG and GD). For DG: Y = -181.723 2.4327Χ;₁ 1.2548Χ;₂ 1.2128Χ;₃ 2.2128Χ;₄; for GD: Y = -241.131 3.1122Χ;₁ 2.0166Χ;₂ 1.7543Χ;₃ 2.7312Χ;₄. These results will help abalone breeding practices and be useful for selecting growthrelated traits in genetic breeding program of hybrid abalone.