These fish know how to dive. Japan’s Tsukiji fish market recently held its first bluefin tuna auction of 2015, and the first fish — which sold for $1.76 million in 2013 — sold for an underwhelming $37,000. Sushi magnate Kiyoshi Kimura netted the 400-pound fish and credited a good harvest for the drop in price. But the depreciation probably had more to do with a lack of rival bidders. Tuna populations, after all, are still in decline, and demand is as high as ever.