Fish drink water – makes sense, doesn’t it? They don’t just drink it in the same way we do, though; they also absorb it through a process called osmosis.
Osmosis is where water flows across their scales and bodies, and the membranes on their skin take in water. But that doesn’t give them enough water to live on, so fish have to drink through their mouths as well, otherwise they could potentially die from dehydration. Isn’t that odd, to think of a fish swimming in all that water and dehydrating because it hasn’t drunk enough?
So remember that, if you have fish in a tank at home, that when you next fill it up, you’re giving it its drinking water as well as its home.