1, the growth environment is different: freshwater silverfish in the natural growth environment, commonly found in rivers and lakes, originating in Taihu Lake, Dongting Lake, Poyang Lake, etc.; sea silverfish originating in the Bohai Bay, Yellow Sea, East China Sea and so on.

2, the size is different: freshwater silverfish is smaller, usually only about 5 centimeters, covered with tiny scales; while the sea silverfish grows in the ocean, the body size is larger.