Of course, if you've seen one elderly Asian sheepshead wrasse, you've seen them all.

当然，如果你见过一只年老的亚洲羊濑鱼，你就见过所有的了。

One good sign of health for our oceans is the mere existence of older fish, like this Asian sheepshead wrasse in the China Sea.

康的一个征兆就是较老的鱼的存在，譬如说这只在中国的亚洲羊濑鱼。