Volunteers with the Channel Islands Marine & Wildlife Institute in Santa Barbara, California, rescue a sick sea lion that's likely suffering fromdomoic acid poisoning. David Swanson / AFP via Getty ImagesIt started as a normal surf session for RJ LaMendola. He was roughly 150 yards from the beach in Southern California, riding the waves and enjoying the peaceful solitude.But the situation quickly turned violent when a sea lion emerged from the water and charged at LaMendola. The 20-year surfing veteran tried to remain calm as he frantically paddled back to shore, but the sea lion was behaving unusuallylike some deranged predator, LaMendola wrote in a widely shared post on Facebook. The sea lion made contact, delivering a hard bite on LaMendolas left buttock that pierced through his wetsuit.Never have I had one charge me, especially at that ferocity, mouth open, LaMendola tells the Ventura County Stars Stacie N. Galang and Cheri Carlson. It really was out of, like, a horror movie.Eventually, LaMendola made it back to the sand and drove himself to a nearby emergency room. After being treated, he contacted local wildlife authorities.The most likely explanation for the sea lions abnormally aggressive behavior? The creature was probably suffering from domoic acid poisoning, which results from toxic algae blooms.Across Southern California, authorities are grappling with one of the worst outbreaks of domoic acid poisoning theyve ever seen. Dozens of sea lions and dolphins have been affected by the condition in recent weeks, reports the Los Angeles Times Summer Lin. Birds are also turning up dead, according to the Los Angeles Daily News Erika I. Ritchie.At least 140 sick sea lions are being cared for at the Marine Mammal Care Center in San Pedro, per the Los Angeles Times, because they have a 50 to 65 percent chance of surviving if they receive treatment. Roughly another 45 are being cared for at the Pacific Marine Mammal Center in Laguna Beach, reports the Los Angeles Daily News. SeaWorld San Diego has rescued another 15 this year, reports KGTVs Jane Kim. Other sea lions have been found dead on area beaches.This morning, we had three calls within 30 minutes of daylight breaking, Glenn Gray, CEO of the Pacific Marine Mammal Center, told the Los Angeles Daily News on March 18. Thats the magnitude of it. Members of the public are being urged to report any sick, distressed or dead animals they find on the beach. Beachgoers should also stay away from the animals and give them space. David Swanson / AFP via Getty ImagesDozens of dolphins, meanwhile, are washing up dead or close to death on beaches. Veterinarians are euthanizing the dolphins, because they rarely survive domoic acid poisoning, per the Los Angeles Times.Its the only humane option, says John Warner, CEO of the Marine Mammal Care Center, to the Westside Currents Jamie Paige. Its an awful situation.A similar outbreak occurred in 2023, killing more than 1,000 sea lions. But officials say this year is shaping up to be worse.The harmful algae bloom started roughly five weeks ago. During a bloom, environmental conditions cause microscopic phytoplankton to proliferate. Some species of phytoplankton produce domoic acid, which then accumulates in filter-feeding fish and shellfish. Marine mammals become sickened when they eat the affected fish and shellfish. (Humans can also get sick from eating contaminated fish, shellfish and crustaceans.)In marine mammals, symptoms of domoic acid poisoning include seizures, lethargy, foaming at the mouth and a neck-craning behavior known as stargazing. Biting incidentslike the one LaMendola enduredare rare, but sickened animals have been known to behave aggressively.The neurotoxin is crippling and killing sea lions and dolphins, says Ruth Dover, managing director of the nonprofit Channel Islands Marine & Wildlife Institute, to the Ventura County Star.The bloom likely started when cold water from deep in the Pacific Ocean rose to the surface in February. Now, it also appears to be spreading closer to the shore. Researchers are monitoring the bloom, but so far, they have no indication of how long it will last.Authorities say toxic algae blooms are getting worse and happening more frequently because of climate change, agricultural runoff and other human-caused factors. This is the fourth straight year a domoic acid-producing bloom has developed off Southern California, as Dave Bader, chief operating officer of the Marine Mammal Care Center, tells KNX News Karen Adams.We dont know what the long-term impacts will be for having so many consecutive years of this toxic bloom, Bader adds. But [dolphins are] a sentinel species. Theyre telling us about the health of the ocean, and when we see marine life dying, and were seeing it in increasing levels with more frequency, the oceans telling us somethings off.The ongoing outbreak is taking its toll on Southern California veterinarians, volunteers and beachgoers. The incidents are particularly heartbreaking for lifeguards, who typically comfort dying dolphinsand keep beachgoers awayuntil authorities can arrive.Members of the public are encouraged to report any distressed, sick or dead animals they find on the beach. And, more importantly, they should leave the animals alone. Authorities say pushing a sick creature back into the ocean will likely cause it to drown. Dolphins also become especially agitated when theyre out of the water and people are aroundto the point that they can die from fear.People need to leave them alone and not crowd around them, Warner tells the Los Angeles Times. Selfies kill animals, so use your zoom, and stay away.Get the latest stories in your inbox every weekday.Filed Under: Animals, Beaches, Biology, Birds, California, Conservation, Disease and Illnesses, Dolphins, Mammals, Oceans, Pacific Ocean, Recreation, Sea Lions, Wildlife