Domoic Acid Outbreak Sickens Sea Lions in Malibu, California
Distressed Sea Lions Observed, Public Urged to Exercise Caution
Concerned residents in Malibu, California, have reported an alarming number of distressed sea lions stranded on local beaches, prompting urgent advisories from Southern California officials. The California Wildlife Center has received over two dozen calls since late last week, raising concerns about a potential domoic acid poisoning.
Algal Blooms and Domoic Acid Toxicity
Domoic acid is a neurotoxin produced by certain types of algae during harmful algal blooms. When ingested by marine animals, the toxin can cause severe neurological damage, leading to symptoms such as seizures, head tremors (known as "stargazing"), and lethargic or comatose behavior. The Marine Mammal Care Center explains that domoic acid can also trigger aggressive behavior in sickened animals, potentially posing a danger to humans.
Recent History of Domoic Acid Events
Malibu is no stranger to domoic acid events. In 2023, a harmful algal bloom along the central and southern California coast resulted in the deaths of hundreds of sea lions and dolphins. The affected animals exhibited symptoms consistent with domoic acid poisoning, including foaming at the mouth, seizures, and confusion.
A similar incident occurred in 2024, where a large algae bloom left hundreds of sea lions poisoned. The Marine Mammal Center characterized this event as highly unusual, highlighting the potential impact of climate change on the frequency and severity of algal blooms.
Climate Change and Red Tides
Traditionally, red tides (harmful algal blooms) peaked during the late spring in California. However, due to global warming, these blooms are now extending into the autumn months, increasing the likelihood of domoic acid events.
"In its toxic form, DA damages the brain and heart, even in low doses," cautions the Marine Mammal Care Center. "Signs in marine mammals include seizures, a craning head motion known as ‘stargazing,’ and highly lethargic or comatose states."
Public Health and Safety
Southern California officials strongly advise beachgoers to avoid interacting with distressed sea lions. The California Wildlife Center urges the public to contact their team for assistance with any sightings of sick animals.
Fernando Cervantes Jr., a trending news reporter for USA TODAY, emphasizes the importance of public awareness and caution. "Sickened animals may ‘lunge and bite without warning,’ so the public needs to stay away," he advises.
Conclusion
The ongoing domoic acid outbreak in Malibu serves as a reminder of the potential health risks associated with harmful algal blooms. While the exact cause of the current illness in sea lions remains under investigation, the signs point strongly to domoic acid poisoning. Continued monitoring and public education are crucial to prevent further incidents and ensure the safety of both wildlife and humans.
