1, body type: the dragon pontoon is a giant grouper with an elongated oval body, a relatively large mouth, and a large number of green spots on the head and side of the body. Tiger grouper is a perch-shaped family, the body surface generally have green spots, body size and the dragonet similar, but smaller than the dragonet.

2. Nutritional value: the food value of longfin smelt is high, the meat texture is clear, with a garlic clove like fish, cardiovascular disease has obvious therapeutic effects. The nutritional value of tiger grouper, on the other hand, is average, and is only useful for relieving fatigue and promoting human metabolism.

3, the distribution area: the dragon pontoon often live in the ocean bottom carnivorous fish, the temperature and the pH of the sea water requirements are relatively high, it is easy to produce. Tiger grouper, on the other hand, generally live in the rivers.