Overview
- An eight‑month, multi‑institution study found Karenia cristata dominated large parts of the bloom and was the only detected species known to produce neurotoxic brevetoxins among five Karenia identified.
- The bloom spanned roughly 20,000 square kilometres, with researchers estimating about 1 million animals across more than 550 species died and beachgoers reported respiratory symptoms.
- Authorities say public health advice is unchanged: avoid foamy or discoloured water, people with asthma should carry relievers, commercial seafood remains tested and safe, and self‑collected bivalves should not be eaten.
- Researchers report lower cell counts at some Adelaide metropolitan sites as they investigate K. cristata’s preference for cooler waters and test whether warmer conditions limit its persistence.
- Teams are trialling modified clays for mitigation and continuing analyses of toxin analogues, toxicity and the species’ origin, noting prior records only off South Africa and near Newfoundland.