How do mermaids breathe? Are they like lungfish, coming up for air?

Or do they breath under the sea? I’ve studied some of the films and I amn’t sure what to think.
The documentary film makers at Disney did not seem to address this. They were more concerned with legs but their footage never showed the mers surfacing for a breath while at the same time they could breath out of the water.

I think this could be a good field of study.

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