Thirsty sea creatures: do fish drink water?

As is well known, every living being consists largely of water - including fish. If the body loses water, it must be refilled. But what about fish that live in water - are the animals thirsty and use their natural habitat? Do fish drink water? - Image: Shutterstock / oksankash

Do fish drink water? This question only seems a little unusual at first glance - rather it is justified, because in principle all animals have to drink. In fish, however, the drinking process as such takes place differently, as is known from dogs and cats.

Saltwater fish have to drink water

Saltwater fish actually drink water because the salinity of the water in which they live is so high that the fish are deprived of the liquid. The fish suck in water through the gills, which is then freed of salt by the body's own "filter system". This process can be described as drinking. Freshwater fish, on the other hand, do not have to actively quench their thirst. The reason: the salinity of the fish's body is again higher than that of the water. As a result, the fish absorb water through their skin. Anyone who remembers the biology lessons in the school will know what to do with the keyword "osmosis". A freshwater fish even has to release water at regular intervals to avoid bursting with liquid.

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