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Chefs of the sushi restaurant chain Sushi Zanmai hold a freshly cut piece of a blue fin tuna at the chain's main restaurant at the outer Tsukiji market in Tokyo January 5, 2015. The 180 kg blue fin tuna traded at a price of 4.5 million yen (37,500 USD) and was the most expensive fish at this year's New Year auction at the Tsukiji market, local media reported.   REUTERS/Thomas Peter (JAPAN - Tags: BUSINESS ANIMALS FOOD SOCIETY) - RTR4K2P2 Thomas Peter/Reuters