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Biology

Osmoregulation and Water Balance in Marine Versus Freshwater Teleosts

Quick fact

A marine teleost drinks up to 10% of its body weight in seawater daily to counteract water loss, while a freshwater teleost almost never drinks and instead pumps out up to a third of its body weight in dilute urine each day.

Why this is interesting

A fish in the ocean is constantly losing water to the sea, while a fish in a lake is constantly gaining it. How do they both survive?