两种杂交石斑鱼及其亲本的形态差异分析

Comparison of morphology between two kinds of hybrid groupers and their parents

为研究两种杂交石斑鱼及其亲本的形态差异,实验采用传统形态学测定与现代框架测定结合的方法,测定了青龙斑(斜带石斑鱼♀×鞍带石斑鱼♂)和虎龙斑(棕点石斑鱼♀×鞍带石斑鱼♂)及其亲本的可数性状和可量性状,并进行相关统计分析。结果显示,在外观方面,青龙斑与亲本相比,其斜带边缘清晰连贯,而虎龙斑体侧分布有不同于亲本的大型环状斑;在外部形态框架方面,青龙斑背鳍前端及躯干形态都偏向于母本,呈现出背腹部压缩的细长型,而虎龙斑背鳍前端的框架形态偏向于母本、躯干的框架形态却偏向于父本,呈现出两种框架形态组合的特点。综合传统可量数据和框架数据聚类分析、判别分析和主成分分析的结果表明:两种杂交石斑鱼在外部形态方面更偏向于母本。

In order to find the morphological differences between the two kinds of hybrid groupers and their parents,Hybrid 1（ Epinephelus coioides ♀ × Epinephelus lanceolatus ♂） and Hybrid 2（ Epinephelus fuscogutatus♀ × Epinephelus lanceolatus ♂）,we measured their body and analyzed meristic data and metric characters by using the method of statistics,including ANOVA analysis and three types of multivariation analyses. The results showed that the edge of inclined belt on Hybrid1’s body was clear and coherent,and there were large annular plaques on Hybrid 2,all those were different from their parents.Furthermore,the analysis based on the morphology framework showed the shape of front dorsal fin and trunk of Hybrid 1was inclined to its female parent,however,Hybrid’s front dorsal fin shape was also similar to its famale parent while its trunk shape resembled its male parent,which proved that it was a hybrid of two forms. Comprehensive statistical analysis,such as cluster analysis,discrimination analysis and principal component analysis,indicated that both kinds of hybrids resembled their female parents in morphological characteristics.