LetMeExplain: episode 1; fish part 1, do fish get thirsty?

Before I begin, please comment what you think now, the after reply to it saying what you think after. Ok, so fish get air from water. Their lungs cannot breathe normal air because their bodies are meant to filter water, not air. We filter air by exhaling, (breathing out,) Carbon Dioxide and other stuff in air thats not Oxygen. Fish are different. Their gulls are what they have instead, and they use gills to filter water because water, believe it or not, has oxygen in it. The gills get the oxygen and push out the rest. In my opinion, no, because they breathe from the water, not drink it, but thats just me.

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