Sick Sea Lion Rescued from Santa Monica Beach Amid Surge in Marine Mammal Illnesses

Santa Monica Beach became the site of a marine rescue on Monday, March 10, 2025, as Marine Mammal Care Center (MMCC) personnel responded to reports of a 300-400 pound male sea lion displaying signs of illness. The animal was carefully secured and transported to MMCC for urgent treatment.

Rescue personnel confirmed that the sea lion was likely suffering from domoic acid toxicosis, a condition caused by toxic algal blooms off the California coast. These blooms are triggered by Pseudo-nitzschia australis, a type of algae that produces the neurotoxin domoic acid. This toxin accumulates in small fish such as sardines and anchovies, which are then consumed in large quantities by sea lions, leading to severe neurological and cardiac issues.

Understanding Domoic Acid Poisoning

Domoic acid attacks the brain and the heart, causing seizures, neurological impairment, and heart failure in marine mammals. If left untreated, the toxin can result in permanent brain damage, and repeated exposure can lead to longer-lasting and more serious effects.

While there is no direct cure for domoic acid poisoning, MMCC veterinarians employ supportive treatments to help affected animals recover. This includes:

• Flushing the toxin from their system with fluids
• Providing fish that is free of domoic acid
• Administering anti-seizure medications, similar to those used for humans
• Exploring new therapies to reduce brain inflammation and minimize long-term damage

“Since the toxin is water-soluble, we hydrate the animals as much as possible,” explained an MMCC rescuer on-site. “If we can get them into care before significant damage occurs, we have a good chance of helping them recover.”

Public Urged to Report Stranded Marine Mammals

Authorities have noted a significant increase in sick and stranded sea lions along Los Angeles County’s coastline. MMCC urges the public to remain vigilant and report any sightings of distressed marine mammals by calling 1-800-39-WHALE.

To ensure safety for both wildlife and the public, MMCC has issued the following guidelines:

DO:

✅ Maintain a distance of at least 50 feet from marine mammals.

✅ Use a camera’s zoom function to take photographs.

✅ Keep pets leashed to prevent interactions with the animals.

✅ Call 1-800-39-WHALE or notify a lifeguard if a marine mammal appears distressed.

DON’T:

🚫 Approach, touch, or attempt to move the animal.

🚫 Try to feed the sea lion, as human food can be harmful.

🚫 Take selfies up close—use a zoom lens from a safe distance.

Coastal Alert: Surge in Sea Lion Strandings

Authorities have issued an urgent coastal alert following a sharp increase in sea lions found stranded along the Southern California coast. Toxic algal blooms have been affecting marine mammals in growing numbers, leading to widespread reports of disoriented and sick sea lions washing ashore.

MMCC continues to play a critical role in responding to this crisis, rescuing and rehabilitating marine mammals suffering from domoic acid poisoning. The center, which has been operational since 1992, remains one of the busiest year-round marine mammal rehabilitation facilities in the nation.

The Santa Monica sea lion rescue serves as a stark reminder of the ongoing environmental challenges impacting marine life. With public awareness and swift action, conservation efforts can help ensure the health and survival of these vulnerable animals.