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In October last year one or two local fisherman posted on social media that they had landed a few Atlantic saury.

As fish make for cooler climates, some species such as the Pacific saury and flying squid are moving farther into open waters and out of the reach of Japanese fishermen, particularly as fuel prices rise.

He suspects the low-oxygen zone acts like a fence, confining mackerel, saury, and other prey into a smaller, oxygen-rich pool of water near the surface.

Whales may also be moving away from the Japanese coasts due to a scarcity of saury, a staple of their diet, and other fish possibly due to the impact of climate change, Kubo said.

“I had saved a packet of potato chips and a can of saury” — a type of fish — “for it.”