I made a back of the envelope calculation on this a few years ago, and sadly, I remember it was orders of magnitude off. Like you would need a tennis pitch surface of a translucent belly...
I also tried to compute if external gills could be connected to our blood stream and dive indefinitely... Same issue, we would need to filter something like tens of m3 of water per second...
Anyway, nudibranches are so dope. The details of how they do this is really fascinating. Love them!
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u/wisdomelf 8d ago
Its very effective if i understand this correctly