Marine (our ocean) fish are stantly drinking to keep their bodies hydrated, but not all that water goes to their bellies. Some of the seawater passes over special salt-extracting cells in their gills; the rest is swallowed down. A saltwater fish’s gills and kidneys work overtime to process all the salt and flush it back into the ocean. Freshwater fish and sharks, meanwhile, don’t need to drink water. Water passing over their gills combined with the chemical makeup of the fluids in their bodies keep them hydrated.
Picture Credit : Google
