People are being urged to avoid contact with a popular Queenstown lake due to concerns about toxic algal blooms.
Swimmers are being told to avoid Lake Hayes. Photo: 123RF
A green discolouration was found at the northern end of Lake Hayes last week.
The Otago Regional Council said the water was being tested to check whether it was cyanobacteria - which can produce toxins harmful to people and animals.
The council says people should take a precautionary approach and stay out of Lake Hayes.
Dogs should also not be allowed in the water.