El Niño May Lead to Mass Stranding of Marine Mammals Along California Coast
El Niño May Lead to Mass Stranding of Marine Mammals Along California Coast
US · Published Sep 9, 2026
A strong El Niño event, combined with an ongoing marine heatwave, is raising concerns about potential mass strandings of marine mammals along the California coast.
The Marine Mammal Care Center in Los Angeles County is preparing for an influx of malnourished sea lion pups and other marine animals, similar to events observed during the 2013-2016 El Niño period.

Impact & Risks

The disruption of coastal upwelling due to El Niño and marine heatwaves could lead to food shortages for marine life, particularly affecting young animals like sea lion pups. These animals lack the ability to travel long distances to find food, making them vulnerable to malnutrition and stranding. Furthermore, toxic algae blooms linked to warm waters may increase cases of domoic acid poisoning, posing additional risks to marine mammals. Wildlife rehabilitation centres are bracing for a surge in distressed animals, which could strain their resources and impact their ability to provide care.

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