1. Freshwater fish don’t drink water. They absorb it through their skin. Saltwater fish however, do drink water and their gills process out the salt. 2. Fish do burp but do not fart. (Don’t blame it on the fish). 3. Fish don’t cry. Only larger brain mammals have emotions that allow them to cry. 4. Fish can drown. Fish derive their oxygen from the air that is dissolved in the water in which they swim. Oxygen diffuses through the fishes gills. If no air, they drown.