A harmful algal bloom (HAB) near California (USA) has caused thousands of sea lions to become ill and aggressive, with some attacking nearby humans. The culprit is Domoic acid, a neurotoxin released by the algae diatom Pseudo-nitzschia, which blooms explosively under certain conditions. How Domoic Acid Affects Sea Lions What Are Harmful Algal Blooms (HABs)? Causes of HABs? (Sources: DOE & NOAA)
