Authorities say a recent harmful bacteria bloom at Island Lake in the Wilderness section of the Garden Route National Park in the Western Cape, which created scum-like foam in the local lake, has dissipated. However, further tests are needed before the waterbody is reopened to the public.
The bloom, caused by cyanobacteria, produced toxins harmful to humans, animals, and aquatic life. Experts attribute these blooms primarily to nutrient loading—particularly phosphorus and nitrogen—from agricultural runoff, wastewater treatment plants, and natural organic decay in lake systems.
“With colder weather, the algal blooms are dissipating,” said a spokesperson. Recent tests found no toxin-producing bacteria, and satellite imagery confirmed the bloom has subsided. Officials are optimistic the lake will reopen soon but are conducting final safety checks.
Meanwhile, a separate outbreak of avian botulism has killed nearly 200 birds in the area. While caused by different bacteria, the disease thrives under similar environmental conditions. The toxin leads to paralysis, respiratory failure, and drowning in birds.
Authorities are monitoring the situation and removing carcasses to prevent further spread. The public has been urged to report lethargic or dead birds to SANParks immediately.
