浙江大黄鱼野生群体与养殖群体形态特征比较OA

To explore the morphological divergence between wild and cultured populations of Larimichthys crocea,we integrated traditional morphometrics with the truss network method in this study.A total of 178 wild individuals and 154 cultured individuals were sampled from the offshore waters of Zhejiang Province,and 31 morphological characteristics were measured.We then performed independent-sample t-tests,principal component analysis(PCA),and stepwise discriminant analysis(SDA)to quantify inter-population morphological differences.The results indicated that four truss measurements(D1-3,D6-8,D8-9,and D8-11)differed significantly between the two populations(P<0.05),while 20 traits including condition factor,the ratios of eye diameter to head length,head length to body length,body depth to body length,and caudal peduncle depth to length exhibited highly significant differences(P<0.01).PCA extracted eight principal components,which collectively explained 78.6%of the total morphological variance,and the first two principal components(PC1 and PC2)successfully separated the two populations.SDA screened nine key discriminant traits,achieving 100%classification accuracy in both the original classification and cross-validation.In general,wild L.crocea has a slimmer and more elongated body shape,whereas cultured individuals are shorter and more robust.These morphological differences are primarily driven by long-term adaptive evolution to contrasting living environments.Our findings provide important reference for stock identification,germplasm assessment,selective breeding,and sustainable resource management of L.crocea.