El Niño drives California sea lion crisis: domoic acid surge, starving pups
Ocean warming fuels toxic algae blooms and pushes nursing mothers north, overwhelming rescue centers with record animal arrivals.
What to know
- The Marine Mammal Center in Sausalito has treated more than 150 sea lions for domoic acid poisoning in 2026—more than double the typical annual number—as El Niño-fueled toxic algae blooms spread along the California coast.
- Ocean warming is pushing nursing sea lion mothers farther north to find food, abandoning pups on Southern California beaches where they are left to starve; conditions mirror the catastrophic 2013–2016 stranding event.
- Call volumes at rescue centers have surged from 60–100 daily calls to 300–600 daily, overwhelming staff capacity; a single rescue requires four to six people to safely transport animals weighing 300+ pounds.
- Scientists point to El Niño's disruption of coastal upwelling—the natural process that brings nutrient-rich water and food sources to the surface—as the root cause of both toxic algae proliferation and food scarcity for sea lions.
“Adult animals can usually figure it out. They can swim further. They can go out to find where the food is. The young animals just don't have that same physiological capacity, perhaps, or just not the long-term knowledge that a more seasoned adult animal would have. So they end up stranding in droves.”
Dave Bader, Marine Mammal Care Center chief operations officer · LA Times ↗ · Sep 7
Dan Costa Ecology professor at UC Santa CruzDave Bader Chief operations and education officer, Marine Mammal Care CenterGiancarlo Rulli 22-year staffer at Marine Mammal Center, SausalitoJustin Hodges Staff member, Sausalito rescue center call line
How it unfolded 2 developments, newest first · click a bar or a number to jump articlesposts
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Scientists attribute crisis to warming-driven changes in sea lion feeding patterns
UC Santa Cruz ecologist Dan Costa explains that El Niño warming fuels harmful algal blooms while pushing sea lions farther north in search of food, leaving nursing pups abandoned on traditional Southern California breeding grounds to starve.
“Because of the El Niño you have warming, which probably helps the harmful bloom. And then that domoic acid gets released, fish eat it, and then it biomagnifies in the fish.”
— Dan Costa -
first by Mastodon, 12d ago · also Independent UK
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background
Record sea lion arrivals strain rescue operations; domoic acid cases exceed 150 — The Marine Mammal Center in Sausalito has now treated more than 150 sea lions suffering from domoic acid poisoning since the start of the year—more than double the typical number. Call volumes at the Sausalito rescue center have jumped from 60–100 daily calls last year to 300–600 calls per day, forcing staff to triage cases by location, severity, and available resources.
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background
Domoic acid poisoning surge documented in Northern California sea lions — The Marine Mammal Center in Sausalito reports treating more than 100 sea lions for domoic acid poisoning, above its annual average of 75–90, with most cases arriving since July as toxic algae blooms spread along the northern California coast.
- 2 days quiet
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LA Times reports mass sea lion stranding threat from El Niño and marine heat wave
As El Niño and an ongoing marine heatwave threaten California, marine mammal rescue centers brace for possible mass strandings of underfed pups, comparing current conditions to the 2013–2016 crisis that saw thousands of California sea lion pups in distress.
“When we've seen conditions like this, the major effect for Southern California has been mass stranding of malnourished pups.”
— Dave Bader -
2 outlets El Niño could bring waves of starving sea lion pups to California beaches. It's happened before
first by LA Times, 16d ago · also LA Times California
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