I assume water to them is analogous to air for us and is the medium they are living and breathing in. But all organisms (to my knowledge) require water to survive and so the idea of them drinking a small amount of the water they swim in every now and then seems ridiculous to me.
In: Biology
Some do! It depends on if they’re in fresh water or salty. There’s this thing, osmosis, where water tries to even out the salt concentration so it will go from where there’s less salt to where there’s more. As a result, freshwater fish get enough just by existing (because the salt concentration in their bodies is higher than that of the water they live in) while saltwater fish do need to ingest some water because they live in, well, salty water. And both have ways of maintaining their salt levels do they don’t get too high or low.
Latest Answers