Tuna populations were declining until measures were taken to protect the fish.
Slices of tuna are seen at a facility of the Sushi Ginza Onodera restaurant after the annual tuna auction held at Toyosu Market on Jan. 05, 2021, in Tokyo, Japan. Major wholesaler Yamayuki purchased the highest priced tuna, weighing 208.4 kilograms for 20.84 million yen at the year's first auction. Takashi Aoyama/Getty Images/TNS