离岸养殖与陆基养殖尖吻鲈形态性状 与体质量的相关性研究

The relationship between morphological attributes on body weight and morphological differentiation of Lates calcarifer was explored, 9 morphological attributes including head length (X₁), stem length (X₂), body length (X₃), full length (X₄), body height (X₅), eye diameter (Χ₆), snout length (X₇), caudal peduncle height (X8), caudal peduncle length (X₉) and body weight (Y) was measured from Hainan Lingshui land-based culture and Nansha Meiji Reef offshore sea cage culture population of fifteen month old Lates calcarifer by correla­tion analysis, path analysis and regression analysis. The results showed that there were no significant differences in the eye diameter and snout length in the two breeding conditions, but in the body weight, head length, stem length, body length, full length, body height, caudal peduncle height, caudal peduncle length and the ratio of body height and full length was very significant difference (P<0.01). There were significant correlations or high­ly significant correlations (P<0.01 or P<0.05) among the 9 morphological attributes and body weight in land- based culture population, and similar results in Meiji reef’s offshore sea cage culture population in addition to X₆ and X₇ have no significant correlation. The path analysis revealed that the direct effects of X₄ and X₅ on body weight were significant (P<0.01) in land-based culture population, and the direct effects of X₃, X₅ and X₉ on body weight were significant or highly significant (P<0. 01 or P<0. 05) in Meiji reef’s offshore sea cage culture population. The analysis results of determination coefficients showed that the total decision coefficient of morpho­logical attributes to body weight is find to be 0. 971 and 0. 864 respectively, and indicating the morphological at­tributes are the main factor to body weight. The multiple regression equation was expressed as Y = -1 128. 61 + 3. 143 X₄ + 6. 418 X₅ , Y = -2 054. 81 + 7. 377 X₃ +9. 196 X₅ -10. 041 X₉ are established by stepwise regres­sion analysis respectively. The findings indicate that there are significant differences in the 2 rearing model of L. calcarifer, and Meiji reef’s offshore sea cage aquaculture advantage the body shape of L. calcarifer.