1. Species difference: Perch and Siniperca chuatsi are two different fishes with different biological characteristics and growth environment. The meat of perch is tender and tastes better, so the price is higher.

2. Breeding cost: The breeding cost of perch is relatively high. Bass needs cleaner water quality and finer culture management, so culture is difficult and costly. However, the cost and price of mandarin fish farming are relatively low.

3. Market demand: The market demand for perch is large, especially in some high-end catering markets. The market demand of mandarin fish is relatively small and the price is relatively low.