The sailfish is known for its dorsal fin.

旗鱼以其背鳍而闻名。

A sailfish has a distinctive sail-like dorsal fin.

旗鱼有一个独特的帆状背鳍。

The bowfin has a long dorsal fin that runs along its back.

弓鳍鱼有一个沿着背部延伸的长背鳍。

The dorsal fin is spinous.

背鳍有很多刺.

The dorsal fin, eg of a shark

背鳍（如鲨鱼的）。

First dorsal fin dusky to black.

第一背鳍暗色到黑色的。

It's paired with a long continuous dorsal fin.

它有长长的连续的背鳍。

The first dorsal fin is black at the front.

第一个（刺背鳍是在前面的黑。

A goldfish LanChou belongs to the egg, dorsal fin.

兰畴属于蛋种金鱼, 无背鳍.

The rising dorsal fin is a clear signal to back off.

升起背鳍是后退的明确信号。