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Source: ONE News
The Canterbury District Health Board has issued another health warning after more potentially toxic blue-green algae was found in Lake Forsyth/Wairewa on Banks Peninsula.
The DHB says people should stay out of the lake until the health warnings have been lifted.
Toxic algae are particularly dangerous for dogs, so they should be kept away from the water, it says.
Canterbury Medical Officer of Health Dr Alistair Humphrey says the algal bloom can produce toxins harmful to humans and animals.
"Exposure may cause skin rashes, nausea, stomach cramps, tingling and numbness around the mouth and fingertips. If you experience any of these symptoms after contact with contaminated water, visit your doctor immediately," he said.
No one should drink the water from the lake at any time, Humphrey said. Boiling the water does not remove the toxin, though ordinary tap water from community supplies is not affected by the algal bloom, he said.
Animals should be taken to a vet immediately if they come into contact with the algal bloom or if they display any unusual symptoms.
Fish and shellfish can concentrate toxins and their consumption should be avoided. If fish are eaten, remove the gut and liver and wash in clean water.
Environment Canterbury monitors the lake weekly during summer and the public will be advised of any changes in water quality that are of public health significance.
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