鱼类体长是重要的生物学特征。它不仅是分类的依据，而且是评价生长性能，进行遗传评估的重要指标。但是，关于鱼类体长的定义各家众说不一，学术界至少有三种定义，即吻端至测线鳞（或纵列鳞）最后一个鳞片末端、吻端至脊椎骨末端和吻端至尾鳍基部。对同一尾鱼来说，依据不同? Fish body length is an important biological feature. It is not only the basis for classification, but also an important indicator for evaluating growth performance and genetic evaluation. However, the definitions of fish body length vary from person to person. There are at least three definitions in the academic world, from the tip of the snout to the end of the last scale of the line scale (or longitudinal scale), the tip of the kiss to the tip of the vertebra and the tip of the tail to the caudal fin Base. For the same tail fish, based on different?