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Disoriented California sea lions, some convulsing uncontrollably from neurotoxin-induced seizures along Central Coast beaches, present a difficult challenge this spring for trained responders and veterinarians at The Marine Mammal Center. The Center urges beachgoers to keep themselves and their pets at a safe distance from these sick animals and understand that trained responders may not be able to rescue sick sea lions right away due to the impacts of the current coronavirus pandemic.

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Monterey, Santa Cruz and San Luis Obispo counties are the busiest areas for response during this current spike in cases. Given historic patterns, the Center expects to continue rescuing animals with domoic acid poisoning throughout the summer months.

With reduced personnel due to the current pandemic, if a large outbreak event occurs, the public should expect a slower response time from the Center, particularly for larger animals that require more trained responders and resources to rescue. Getting too close to a sick sea lion before our trained responders arrive increases the risk of even more damaging health effects to an already physically stressed animal. These symptoms are the most likely visuals that beachgoers can expect if they come across a sick sea lion impacted by the toxin.

What is a dolphin? A dolphin is an aquatic mammal. There are a various amount of species of

Domoic acid in sea lions is most commonly caused by a type of algae called Pseudo-nitzschia australis. This naturally occurring neurotoxin accumulates in small fish, like sardines and anchovies, which are then eaten by sea lions in large quantities. Pregnant females cannot quickly clear domoic acid poisoning from their system in one to two days like other sea lions. Pups that are exposed to domoic acid poisoning in utero are often stillborn or exhibit developmental changes such as epileptic seizures and other conditions that result in their death within their first few years of life.

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The history of domoic acid along the California coast is not new. The Marine Mammal Center was the first organization to discover the neurotoxin in California sea lions in and has authored or coauthored a dozen scientific papers on its impacts. In recent years, increasing ocean temperatures have led to spikes in domoic acid poisoning occurring year-round instead of seasonally.

The Center works closely with the National Oceanic and Atmospheric Administration NOAA to investigate the disease processes in wild marine mammal populations, including California sea lions. The documentation of the disease both through samples and treatment is critical to better understanding larger threats to the populations at large and human health as well.]