Kousuke Masaoka, 37, crew member on the Nakajomaru fishing boat, catches a katsuo (skipjack tuna) using traditional ipponzuri (single pole fishing method), in Tosa Bay, Kochi Prefecture, Japan, May 15, 2022. Locals and experts say fatty katsuo indicates climate change and a risk for the fish numbers already under threat due to growing demand and overfishing. It "must have something to do with the water temperature," captain Takeo Nakajo, 70, said. "I have a sense of urgency thinking what if katsuo doesn't come to the bay some day." REUTERS/Kim Kyung-Hoon SEARCH "KYUNG-HOON JAPAN SUSHI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES