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It just seems like it would be a really cool thing to have gills and be able to populate the oceans in the same way we populate the land. We could have houses and shops and vehicles, andgo on walks/swims and just kind of live underwater.
Start a whole new second species of human here on earth maybe, Who knows?
There's not enough oxygen in water to support our metabolisms, even if we had gills.
Fish are adapted to conserve and use less oxygen, from slower metabolic rates to more options for anaerobic respiration that doesn't poison oneself from within.
Well thats not really the most relevant thing here even if correct because you could give someone gills and let them keep their lungs too just having the gills to extend how long we can dive would be useful
I don't believe this. Sailfish, barracuda, tuna, huge mass, highly active... I'm sure they use a HELL of a lot more oxygen than I do on a good day. Gills extract MORE oxygen than lungs do, they're more efficient.
My unscientific opinion tho.
This article estimates at a 40kg sailfish uses about 2.7 megajoules per day of energy when hunting. That's about 650 kcal.
An 80kg human weighs about twice as much and needs about 3 times the energy, without even exertion.
Warm blooded animals spend a lot of energy just maintaining body temperature. Plus water doesn't have very much oxygen in it, compared to the atmosphere.
Oh sure, if you're going to use facts and science we may as well not even talk.
Seriously though, thanks for the insight.
This is the whole "if humans were going to have wings we'd have to redesign the whole organism from the ground up" fiasco all over again.