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TOKYO, JAPAN - JANUARY 05: Buyers inspect fresh bluefin tuna prior to the this year's first auction at Tsukiji Market on January 5, 2015 in Tokyo, Japan. A fresh whole tuna weighing 180.4 kilograms (397 pounds), sold for 4.51 million yen (approximately $37,500) by Sushi Zanmai, a Tokyo-based sushi chain operator. (Photo by Ken Ishii/Getty Images)

TOKYO, JAPAN - JANUARY 05:  Buyers inspect fresh bluefin tuna prior to the this year's first auction at Tsukiji Market on January 5, 2015 in Tokyo, Japan. A fresh whole tuna weighing 180.4 kilograms (397 pounds), sold for 4.51 million yen (approximately $37,500) by Sushi Zanmai, a Tokyo-based sushi chain operator.  (Photo by Ken Ishii/Getty Images)