The image of a dorsal fin cutting through the sea surface is iconic.

背鳍划破海面是种标志性画面。

So now we're putting in an identification spaghetti tag right into the dorsal fin.

所以现在要在背鳍上放一个识别标签。

They can be identified by the lack of a part of a body often seen on other whales: a dorsal fin.

人们可以通过缺少在其他鲸鱼身上常见的身体部位来识别这种鲸鱼：背鳍。

It had no jaws, and no dorsal or side fins.

它没有下巴，也没有背鳍或侧鳍。

They also had a sharp leg dorsal fin.

他们还有一个锋利的腿背鳍。

It's thought that the angling structure evolved from the spines of the fish's dorsal fin.

人们认为钓鱼结构是从鱼背鳍的刺进化而来的。

Sharks don't have to surface and show us that telltale dorsal fin like in Jaws because we're around and to prove they exist.

鲨鱼不是非得游上来像电影大白鲨似的让我们看到暴露身份的背鳍，因为在我们周围要证明它们的存在。

He takes photos of their dorsal fins. Each notch, scar, and blemish is a unique fingerprint that allows scientists to identify individual animals.

他拍摄了那些海豚的背鳍照片。每一个划痕、伤疤和小瑕疵都是独特的印记，这些印记可以让科学家们认出它们谁是谁。

Those animals are only members of the genus Balaenoptera furnished with dorsal fins, and like sperm whales, they're generally smaller than the bowhead whale.

这些东西不过是鲸科，有脊鳍的动物，大头鲸也一样。它们通常比普通白鲸小一些啊！

He could see their tall, black dorsal fins poking up out of the water, flashes of their white eye markings.

安妮：他可以看到它们高大的黑色背鳍从水中伸出，白色的眼斑闪烁。

Also called suckerfish, their amazing grip comes from an adhesive disk made from a modified dorsal fin on the fish's head.

也称为吸盘鱼，它们惊人的抓握力来自鱼头上由改良背鳍制成的粘性盘。

Osteostracans also boasted a brand-new feature: fins -- namely, dorsal fins and small, paddle-like side-fins that gave them greater mobility in the water.

Osteostracans 还拥有一个全新的特征：鳍——即背鳍和小的桨状侧鳍，使它们在水中具有更大的活动能力。

Ancient Aztec people considered it the incarnation of a God named Xolotl— hence the axolotl's name, roughly meaning " water monster." Axolotls reach sexual maturity with gills and a tadpole-like dorsal fin.

古代阿兹特克人认为它是名为 Xolotl 的神的化身——蝾螈的名字由此而来，大致意思是“水怪” 。 蝾螈通过鳃和蝌蚪状背鳍达到性成熟。

One possibility is that these traits are lost and then simply reappear, in much the same way that similar structures can independently arise in unrelated species, such as the dorsal fins of sharks and killer whales.

一个可能性就是这些特征失去了，然后又重现了，和相似结构可以独立出现于不相关物种的方式几乎相同，比如鲨鱼和虎鲸的背鳍。