Fishes have swimbladders, which fill with gas and floats them up and down. Some types of fishes can actually gulp air to regulate buoyancy. The ocean zones are roughly epipelagic, at the top; below that are mesopelagic, bath pelagic, abyssal pelagic, and finally the very, very bottom,. That's like the deep, dark. If anyone ever wins Jeopardy or a bet, you owe me exactly one American dollar for this information.

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