Direct sales. Bluefin tuna sashimi sold on Taobao dozens of dollars a pound, because the manufacturer direct sales, no middleman to earn the difference, so cheap. Atlantic bluefin tuna (scientific name: Thunnusthynnus): is the mackerel-shaped order, mackerel family, tuna genus of marine animals. The length of the body can reach 3 meters, weighing about 400 kilograms; the general tuna fishing boat to catch about 150 kilograms of the majority, more than 200 kilograms or more is a good harvest.