How to distinguish between saltwater animal to freshwater animal?
Among all the fish, goldfish can only live in freshwater. Other fish can live both saltwater and freshwater and they are called euryhaline fish, such as flounder, eels, red drum, salmon, and striped bass. Moreover, freshwater fish are commonly found in rivers, lakes, and streams. The rest of these fish are living in the deep ocean which has a high saline level.