1. rarity: Duobao fish is a rare marine fish, and its price is higher because of its slow growth and relatively small quantity. However, salmon is relatively common and the price is relatively low.

2. Nutritional value: Duobao fish is rich in protein, vitamins and minerals, which has a good nourishing effect on human body. The salmon also has similar nutritional value, but it is slightly inferior to the treasure fish.

3. Taste and quality: Duobao fish is considered as a high-quality food because of its tender meat, delicious taste and unique fragrance. However, the taste and quality of salmon are relatively inferior.