How to buy fish at fish markets

I’ll tell you about the auctions at local fish markets.
Only people who has the rights to buy at the fish market can take part in the fish auction. Fifty to 100 buyers from places like local fish shops or super markets come to buy fish at the markets every morning.
When you find some fish worth buying, you have to show the price you decided to the auctioneer with the secret hand sign and the person who offers the highest price can buy the fish.