Researchers have revealed the cause behind the recent deaths of multiple marine animals off the California coast. Here’s a point-by-point summary:
1. Cause Identified: Toxic Algal Bloom
- One of the largest algae blooms in Southern California has been linked to the deaths of marine animals.
- The Pacific Marine Mammal Center (PMMC) confirmed the connection in a news release on April 23, 2025.
2. Whale Deaths Confirmed
- A female humpback whale was found dead on January 24 at Huntington Beach.
- A male minke whale was stranded and later died on April 6 in Long Beach after displaying unusual swimming behaviors.
3. Domoic Acid Detected
- Testing showed both whales had high levels of domoic acid, a harmful neurotoxin, in their stomachs and urine.
- Domoic acid is produced when small fish, like sardines, consume toxic algae.
4. Broader Impact on Marine Life
- Dr. Alissa Deming, PMMC’s Vice President of Conservation Medicine + Science, stated that mass strandings of California sea lions and dolphins are also being reported.
- “This bloom is negatively affecting record numbers of sea lions, dolphins — and now multiple whale species,” she said.
5. Official Cause of Death
- Both whales’ deaths were officially attributed to domoic acid toxicosis.
- Two more whale deaths may be linked to the toxin, but lab results are still pending.
6. Ongoing Concerns
- Experts warn that harmful algal blooms could become more frequent due to changing ocean conditions.
- The event raises serious concerns about the future health of marine ecosystems.