Toxic algae blooms cause surge in sick sea lions
Sep 10, 2026
SAN FRANCISCO (KRON) -- California coastline's is experiencing "two serious wildlife emergencies at the same time," with sea lions dying from toxins produced by algae blooms, and sea birds starving from lack of fish, marine wildlife rescuers said.
Sea lions are showing signs of domoic acid poisonin
g around the Monterey Bay. Calls from the public reporting sick sea lions have nearly doubled, rescue groups told KRON4.
"Seals and sea lions along our coast are being affected by domoic acid, a neurotoxin produced by the algae Pseudo-nitzschia during harmful algal blooms," Santa Cruz-based Native Animal Rescue wrote. Impacted marine mammals may appear disoriented, lethargic, unusually aggressive, or experience seizures and other neurological symptoms, according to NAR.
Sea lions rescued by trained volunteers are sent to the Marine Mammal Center in Sausalito until they recover.
California sea lions swim through the Monterey Bay, (Getty Images / File)
Giancarlo Rulli of the Marine Mammal Center said there's still a lot unknown about domoic acid disease.
The "brutal" nature of the disease can cause permanent brain and heart damage to sea lions, and death, Rulli told KRON4. "We have rescued 150 sea lions so far this year. More than 110 have come in since July 1."
At the same time, NAR said it is seeing "an alarming influx of weak and emaciated Common Murres coming ashore. Murres are pelagic seabirds, which means they belong on the open ocean."
A common murre is seen at Natural Bridges State Beach in Santa Cruz. (Getty Images)
As ocean temperatures rise, the birds' prey fish may swim into deeper colder water, NAR said. "Murres are exceptional divers, but when their prey becomes less accessible, they can struggle to find enough food. We are now seeing the consequences: exhausted, weakened birds washing ashore," Native Animal Rescue wrote.
How you can help:
If you find a murre on land, call Native Animal Rescue at 831-462-0726. "Do not attempt to return the bird to the ocean," NAR wrote.
Give wild animals space. If you see a sick sea lion, stay at least 150 feet away, keep your dog on a leash, and call Marine Mammal Rescue at 415-289-7325.
If you want to help sea lions, the Marine Mammal Center said it needs volunteers more than ever.
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