鲟鱼是硬骨鱼系中一类古老的类群，由于具有极高的营养价值而倍受人们的青睐，经济价值较高。
Acipenser is an old fish group in Osteichthyes because it finds favour in people 's eyes with high not only nutrition but economic value.
硬骨鱼系先前公认的硬骨鱼系的层级不是一个单源的群。它现在有专门的地位，包括像鱼一样的肉鳍次亚纲与条鳍次亚纲。
Osteichthyes the formerly recognized class Osteichthyes is not a monophyletic group. It now has the status of a vernacular to include the fish-like Sarcopterygii and the actinopterygians.
第二艘船上的一根绳子系在鲨鱼的尾巴上，但多次将鱼拖进水里的努力都失败了。
A rope from the second vessel was secured around the shark's tail, but repeated efforts to tow the fish into the water failed.
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