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Health Warning – Algal Bloom in Lake Forsyth
Health Warning – Algal Bloom in Lake Forsyth/ Te Roto o Wairewa
The Community and Public Health division of Canterbury District Health Board has issued a health warning after potentially toxic blue-green algae (planktonic cyanobacteria) was found in Lake Forsyth/Te Roto o Wairewa.
People and animals, particularly children and dogs, should avoid Lake Forsyth/Te Roto o Wairewa until the health warning has been lifted.
The type of cyanobacteria that is currently present in high concentrations is Nodularia spumigena which is a filamentous algae that can produce the hepatotoxin ‘nodularin’. Filaments can (but do not always) aggregate in surface scums. No visible surface scums were sighted at the time of sampling.
Dr Ramon Pink, Canterbury Medical Officer of Health, says the algal bloom can produce toxins harmful to humans and animals; people should avoid contact with the water until further notice.
“Exposure may cause skin rashes, nausea, stomach cramps, tingling and numbness around the mouth and fingertips. If you experience any of these symptoms visit your doctor immediately and please let your doctor know if you have had contact with the lake water,” Dr Ramon Pink says.
“No one should drink the water from the lake at any time.” Dr Pink says boiling the water does not remove the toxin.
Animals that show signs of illness after coming into contact with algal mats should be taken to a vet immediately.
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.
Further information on gathering Mahinga Kai
can be obtained below.
When a bloom of potentially toxic cyanobacteria is present in a lake, there is a possibility of cyanobacteria and toxins being transported downstream. People are advised to avoid contact with the downstream water bodies.
Environment Canterbury monitors the lake weekly until the warning is lifted and the public will be advised of any changes in water quality that are of public health significance.
Facts about cyanobacteria:
• The algae occur naturally but can increase
rapidly during warmer months.
• If the water is cloudy,
discoloured, or has small globules suspended in it, avoid
all contact.
• Not all cyanobacterial blooms are
visible to the naked eye and toxins can persist after the
blooms disappear.
• Cyanobacterial concentrations can
change quickly with changing environmental conditions (e.g.
wind). If a health warning is in place avoid contact with
the water.
For further information visit https://www.ecan.govt.nz/your-region/your-environment/water/swimming-water-quality/
Canterbury DHB
CDHB
Canterbury District Health Board (CDHB) is a Christchurch, New Zealand based hospital and healthcare provider for the
Canterbury region of New Zealand. Our region extends from Kekerengu in the North, to Rangitata in the South and Arthurs Pass in the West and comprises the six Territorial Local Authorities of Kaikoura, Hurunui, Waimakariri, Christchurch City, Selwyn and Ashburton.
We collaborate with other health and disability organisations, stakeholders and our community to decide what health and disability services are needed and how to best use the funding we receive from Government to improve, promote and protect the health, wellbeing and independence of our population.
At the Canterbury DHB, our vision is to improve the health and wellbeing of people living in Canterbury.
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