Do fishes get thirsty?
We don’t know if fish experience thirst as a sensation, but they do need water and they deal with this need in different ways. Some fishes actively drink water, others don’t. First, it’s kind of obvious but well, fish normally live in water, and water naturally tends to flow toward the solution in which its concentration is lower, that is to say, toward the solution in which the concentration of salts, etc. is higher. The concentration of salts is higher in sea water, intermediate in animal’s bodies, and lower in fresh water, and this is important to understand the following: Those fishes living in the sea or high-salt concentration waters are constantly losing their body water to the environment (mostly through their gills), and need to drink it. These fish have well developed special glands to get rid of the salt in the water that they drink. In contrast, in freshwater fishes, whose body is more concentrated than the surrounding water, water will tend to enter their bodies – so their
