Green ScatYoung stock. Also known as the Argus Fish, Spotted Scat, Argus Scat, or simply Scat, this brackish water species is easily recognized by its greenish body covered in bold black spots. Highly adaptable, the Green Scat is a hardy fish that can thrive in both brackish and, for a time, freshwater aquariums, though long term success is best achieved in slightly brackish conditions. Social and active, they make excellent display fish for larger aquariums.