The species is hard to cultivate because it is difficult to recreate the conditions they are used to in the wild. The result can be seen at Tokyo's Tsukiji fish market, where the frozen tuna carcasses are laid out on the floor ready for the auction's fierce bidding. A single giant tuna can cost you more than a new car. But in the city of Shizoka, in a small shed on a university campus, a businessman is trying to recreate the oceans that the tuna are used to. Blue-fin tuna have been farmed before, but not indoors, the team behind the project says.