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Toxic algae in Te Wairewa/Lake Forsyth
Toxic algae in Te Wairewa/Lake Forsyth
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 Te Wairewa/Lake Forsyth.
People and animals, particularly dogs, should avoid Te Wairewa/Lake Forsyth until the health warning has been lifted.
The type of cyanobacteria currently present in high concentrations is Anabaena. Anabaena forms green globules that float in the water column.
Dr Alistair Humphrey, 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 General Practice team immediately and please let your doctor know if you have had contact with the lake water,” Dr Humphrey says.
No one should drink the water from the lake at any time, Dr Humphrey says. Boiling the water does not remove the toxin.
Animals showing 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,” Dr Humphrey says.
Nutrient overload, especially nitrate and phosphorous levels, can contribute to the risk associated with the development of toxic algae blooms in lakes.
Environment Canterbury will monitor the lake weekly during the bloom and the public will be advised of any changes 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
http://ecan.govt.nz/services/online-services/monitoring/swimming-water-quality/Pages/lake-warnings.aspx
Or
contact Community and Public Health on (03) 364 1777.
ENDS
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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