1. Growing environment: sea tilapia grows in seawater, and freshwater tilapia grows in freshwater environment.
2. Function: Sea tilapia is mainly used as ornamental fish, while freshwater tilapia is mainly used as edible fish.
3. Physical characteristics: sea tilapia is generally larger than freshwater tilapia, and its scales are more colorful, generally purple. In addition, the purple stripes on the pectoral fin, ventral fin, dorsal fin and caudal fin of tilapia are more obvious.
4. Food: Sea tilapia feed on plankton, while freshwater tilapia feed on plants and plankton.
These are the main differences between sea tilapia and freshwater tilapia. Understanding these differences will help to better distinguish the two kinds of fish.