A toxic algal bloom leaving an increasing number of marine mammals stranded along Southern California beaches shows no signs of subsiding and “will only get worse,” officials said Monday.

“This week, we saw more stranded dolphins (both alive and deceased) than we saw during the major domoic acid (DA) bloom in 2023,” Marine Mammal Care Center (MMCC) Los Angeles posted on Facebook.

Recent tests showed DA-producing algae levels have increased, and officials believe that trend will continue in the coming weeks. “We anticipate that it will only get worse,” the post read.

MMCC asked the public not to approach sick dolphins or sea lions on the beach because they can become aggressive upon awakening from a seizure.

“This is a safety issue for people and their pets as much as it is for the marine mammals,” officials said.

Beachgoers were also urged not to push stranded dolphins back into the water, saying it can reduce their chances of survival.

More information about domoic-acid poisoning can be found at https://marinemammalcare.org/domoic-acid/.

The volume of sick marine mammals has also had a financial impact on the MMCC.

“Our team is working heroically to respond to every call and to rescue every animal they can. Please share this post and give now at marinemammalcare.org/donate to give these marine mammals a second chance at life!” the MMCC stated.

Anyone who encounters a sick or stranded marine mammal can alert the nearest lifeguard and call 1-800-39-WHALE to make a report.