I like to visit markets when I travel, because markets always contain local cultural characteristics and a sense of life. If you look closely, you can feel the characteristics of the city. I have been to three seafood markets with different styles and functions on three continents. I have recorded their functions, facilities, products, customers and market levels in detail. By studying and comparing domestic and foreign seafood markets, we can make up for their shortcomings and give full play to their advantages. In my opinion, fish tanks are the medium between people and seafood.