Marine Heatwave Linked to Bering Sea Crab Collapse
Marine Heatwave Linked to Bering Sea Crab Collapse
US · Published Oct 29, 2026
• NOAA scientists have identified a 2018-2019 marine heatwave as the primary cause of a dramatic decline in snow crab populations in Alaska's Eastern Bering Sea. The heatwave led to increased metabolic rates in crabs, reduced their habitat, and caused starvation, according to a study published in Science. The snow crab population dropped by 50% during the heatwave, and subsequent surveys in 2021 recorded the lowest numbers since
• Regulators closed the fishery for the 2022-2023 season, and federal disaster declarations were issued for the 2021-2022 and 2022-2023 seasons. Researchers ruled out bycatch and predation as significant factors, emphasizing the role of starvation due to the heatwave's impact on crab metabolism and foraging areas.

Impact & Risks

The collapse of the snow crab population has had severe economic and ecological consequences. Fishermen in the region face significant financial losses due to the fishery closures, while the ecosystem struggles to adapt to the sudden decline of a key species. The study warns that similar climate-driven events could affect other marine species globally, highlighting the urgent need for adaptive management strategies. The Bering Sea's challenges serve as a stark reminder of the broader impacts of climate change on marine ecosystems.

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