How much does it cost to fish on the Fantasy Westward Journey?

The fallen fish can only be sold to the fish market purchaser at the entrance of the hotel. But don't sell some, such as killing Ding, which can replenish blood 150, but only 600-800. The fish market sometimes raises the price, and then it is more profitable to sell it. Some fish can be summoned, and that kind of fish can't be sold to fish market buyers.