Toxic algae bloom triggers surge of disoriented, seizure-prone sea lions in Central California

A sharp increase in sick California sea lions has been observed off the Central California shoreline, prompting the Marine Mammal Center to intervene. In Monterey County, specialists rescued roughly 15-20 sea lions over three days, most of which are large sub-adult or adult individuals exhibiting ataxic movements, seizures, and other abnormal behaviors. The condition is attributed to domoic acid, a brain-affecting toxin produced by harmful algal blooms that can also cause heart failure and lasting neurological damage.

Affected animals are being transported to a Sausalito hospital for care, while three carcasses were discovered at Moss Landing State Beach. The center’s hotline receives daily calls, and officials advise the public to keep distance from ill sea lions and to notify authorities if they encounter any.