The Toyosu Market in Tokyo, Japan is a 4 million square foot area for squid, mackerel, and, most importantly, tuna. The market is home to the world-renowned tuna auctions, where expert bidders bet millions of dollars on top-tier tuna. But the population of tuna is on the decline, specifically bluefin tuna, which is known as the king of sushi. Business Insider follows expert bidder Takayuki Shinoda inside the fast-paced world of tuna bidding and its role in marine life sustainability.

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