它们还必须不停地游动以避免下沉，因为大多数鱼基本上或完全失去了鱼鳔，这个充满气体的囊帮助大多数其他鱼保持浮力。
They must also keep swimming to keep from sinking, since most have largely or completely lost the swim bladder, the gas-filled sac that helps most other fish remain buoyant.
这其中的大多数鱼不是那么容易被捕捉的。
在沿岸的浅水里，现在大多数鱼已经被捕捞。
In shallow coastal waters, most of the fish tend nowadays to have been caught.
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