1. The living environment is different. The seven-star perch lives in seawater, while the big-mouthed perch lives in fresh water.

2. The characteristics are different. Seven-star perch has a large mouth and fine scales, and its dorsal fin is dotted with black spots. The large-mouth perch is a slender fish with a green to gray upper body and a white or light belly.

3. Different weights, the seven-star bass weighs about 25 kg, and the big-mouthed bass weighs about 1 kg.