The decline of Japanese Chum Salmon is becoming a serious problem for both the environment and the economy. Recent research from Hokkaido University points directly to climate change: warmer waters and less food are shrinking the habitats where these salmon can survive. Scientists are sounding the alarm, saying if people don’t act fast and rethink how to help these fish, things are only going to get worse.

What Factors Are Driving the Decline in Chum Salmon?

Ocean warming: Changes in the sea surface temperatures in the North Pacific have led to a decrease in the available habitats. In the last three decades, the sea surface temperatures have increased in some areas by more than 1-2°C.

Decline in zooplankton: Zooplankton is an important part of the Chum Salmon’s diet, but there has been a decline in zooplankton populations because of changing ocean conditions, which has impacted their growth and survival rates.

Marine heatwaves: Marine heatwaves have increased by more than 50% since the 1980s, impacting the feeding and migration patterns of Chum Salmon.

Habitat loss: A study using data from 1998 to 2022 indicates a significant reduction in marine habitats suitable for Chum Salmon in the North Pacific.

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How Has Climate Change Altered Salmon Distribution Patterns?

Poleward shift: Salmon are observed migrating northward to cooler regions, such as the Chukchi Sea, as the southern region has become less favorable for them.

Shrinkage of southern range: The Gulf of Alaska and the southern North Pacific are experiencing a decline due to rising temperatures.

Alteration in migration routes: Climate change has affected ocean currents and temperatures, forcing salmon to change their traditional migration routes.

Global pattern: Such changes in distribution patterns are also observed in other species, reflecting the effects of climate change on ecosystems.

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What Does This Mean for Japan’s Fisheries and Future Conservation?

The recent decline in Japanese Chum Salmon indicates that Japan’s fisheries and conservation plans are headed in the wrong direction, as two decades ago, there were large numbers of salmon in Japan’s waters, and they made up a big part of the food supply. Now, salmon is grown and imported from Chile and Norway, rather than fished in local waters.

The North Pacific continues to warm, becoming an increasingly unstable marine environment. An effective response to the collapse will require fishery managers to develop adaptive management for the fishery and to conserve coastal habitats, and efforts to mitigate the effects of global climate change are also needed to support these goals. The decline of Chum Salmon in Japan can be seen as part of a global marine biodiversity crisis and highlights the need for international cooperation to address these issues.

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