Disclaimer: I’m assuming this question can be tagged multiple flairs, but biology might be the most fitting, forgive me if im wrong.
I had a random shower thought today, I remember learning about fish and how they breathe, but I dont remember the details. Do they inhale water (H2O) and then take the Oxygen, as a result exhaling 2 Hydrogen? Do fish always exhale air bubbles? I used to own some and I dont remember them doing that unless they went to the surface for a short period of time. I also assume they breathe and drink like we do, or do they only ‘drink’ water when they consume their food since its also saturated with water?
In: Biology
Fish don’t break up water molecules for oxygen so they don’t exhale hydrogen gas. The air bubbles you sometimes see from fish are usually pockets of air they gulp at the surface. This can be for buoyancy control or because the oxygen levels in the water are low. That is to say, there is actually free oxygen dissolved in water in the form of O2, and that’s what fish “breathe”, and then they exhale CO2, but it also gets dissolved into the water instead of becoming a gas.
They absorb water through their skin and gills, and also through food.
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