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Actually, only salt water fish can drink salt water (not fresh water fish), as they have ways to get rid of the extra salt in the water via their gills, specialized salt glands, etc.. Here is a key principle - our body fluids have a very narrow range of osmolarity, meaning if we get too 'salty' or on the other end, if we are too diluted - we could die for various reasons. If we drink water with more salt than our body fluids (or other solutes), we need to get rid of the extra solutes, and the only way to get rid of it is by water and that water comes from our existing body fluids. Salt water fish are not the only ones that can deal with drinking salt water, as some land animals, like seagulls, have supraorbital salt glands above their noses to get rid of a very concentrated salt fluid - that's how they can drink ocean water without losing their existing body fluids. Sharks, skates, rays, and some reptiles etc. can do this too.

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