A particularly agitated sea lion prompted a dramatic retreat by surfers this week as it repeatedly attacked individuals, even venturing onto the shoreline, according to video footage of the encounter.
The animal’s behavior was directly attributed to severe domoic acid poisoning, a consequence of an exceptionally large and toxic algae bloom impacting the region. Experts explained that this bloom specifically affects marine mammals’ neurological systems, triggering heightened aggression in affected animals.
This alarming situation has far-reaching consequences, with thousands of sea lions and other marine life now afflicted. The impact is significantly greater than previously observed, resulting in a higher number of dolphin fatalities—more than recorded in years past—and the tragic deaths of at least two whales.
“These domoic acid events are escalating in size, severity, and frequency,” stated John Warner, CEO of the Marine Mammal Care Center, as he described the situation. “It’s profoundly disturbing to consider how long these species can endure such distress before their survival is jeopardized.”
Beyond domoic acid, the toxic algae bloom also introduces Saxitoxin into the ecosystem. This substance causes paralytic shellfish poisoning and contributes to disorientation amongst affected marine animals, potentially leading to irreversible brain damage and increased aggression.
Ultimately, the afflicted sea lion was humanely euthanized due to its critical condition and limited prospects for recovery. While early intervention can sometimes lead to recovery from toxin exposure, the level of abuse these animals are experiencing—including instances of being deliberately thrown at them—is proving detrimental to their well-being.
Last summer, a similar incident occurred further south along La Jolla Cove in San Diego County, involving another pair of sea lions charging at beachgoers during the breeding season. The recurring nature of these events underscores the urgent need for continued monitoring and research into this growing ecological threat.
