Rising sea temperatures in Hokkaido have caused salmon and trout catches to plummet while enabling the cultivation of sweet potatoes in the region [1, 2].
This shift represents a fundamental transformation of the local economy. As traditional fishing staples vanish, the region must pivot toward new agricultural products to survive the environmental changes brought by global warming.
In the town of Shari, along the coast of the Sea of Okhotsk, the impact on the fishing industry is severe. The weakening of the Oyashio Current has raised water temperatures, destroying the habitat for salmon and pink salmon [1, 2].
Fisherman Shokichi Ito said that monthly catches of pink salmon have dropped from a typical 400 fish [1] to just two fish this year [1]. He described the decline as a sharp, downward plunge.
"This year is two fish a month," Ito said. "The catch is plummeting all at once" [1].
For Shari, the loss is not just financial but cultural. The town identifies as a leader in salmon fishing, leaving residents with few alternatives as the stocks disappear. "We are the number one town for salmon," Ito said. "If there is something else, that would be good, but this is all we have" [1].
While the sea suffers, the land is changing. Rising air temperatures have made it possible to grow sweet potatoes in Hokkaido, a crop traditionally reserved for warmer southern climates [1, 2].
Agricultural workers and local officials are now exploring ways to turn this environmental shift into an economic opportunity. Plans are underway to produce sweet potato shochu, a traditional distilled spirit, as a new regional specialty [1, 2].
Experts note that salmon catches across the region are expected to reach record lows this year [2]. This creates an urgent need for the diversification of Hokkaido's primary industries, moving from a reliance on cold-water marine life to warm-weather agriculture.
“"This year is two fish a month," Ito said. "The catch is plummeting all at once"”
The situation in Hokkaido serves as a microcosm of climate adaptation. The collapse of the pink salmon population illustrates the fragility of specialized marine ecosystems to temperature fluctuations, while the successful growth of sweet potatoes shows how agricultural zones are migrating northward. The transition to shochu production is an attempt to hedge economic risk by replacing a failing natural resource with a new commercial crop.
