Bluefin at Tsukiji Fish Market

Tuna at a fish market
(Fisherman via Wikimedia Commons)

Buyers examine tuna lining the floor of Tsukiji Fish Market in Tokyo, Japan. Ounce per ounce, tuna is one of the most valuable varieties of seafood. In 2011, a single bluefin tuna sold for close to $400,000 in a Japanese market.