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Reminder – Health Warnings in place for Algal Blooms
21 February 2019
For immediate release
Reminder – Health Warnings in place for Algal Blooms at various sites in Canterbury
Canterbury District Health Board’s Community and Public Health unit would like to remind the public that health warnings are still in place for a number of Lakes and Rivers in the Canterbury district.
The warnings to remain out of the following waterways due to ongoing algal blooms are still in place at the following sites:
• Te Roto o Wairewa (Lake Forysth)
• Te Waihora (Lake Ellesmere)
• Lake Pegasus
• Rakahuri (Ashley) River at SH 1 bridge
• Rakahuri (Ashley) River near Rangiora-Loburn Bridge
• Waipara River at Teviotdale
• Waikirikiri (Selwyn) River downstream of the Glentunnel swimming hole
• Waihao River near Bradshaws Rd, South Canterbury
• Lake Rotorua (Kaikoura)
“Many of these waterways have been in bloom for some time now and will continue to be so with the warm weather we have been experiencing” says Dr Alistair Humphrey, Canterbury Medical Officer of Health.
People and animals, particularly dogs, should avoid these waterways until the health warning has been lifted as the blooms can produce toxins that are 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 visit your doctor immediately and please let your doctor know if you have had contact with these waterways,” says Dr Humphrey.
No one should drink the water from these waterways at any time, Dr Humphrey 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.
Environment Canterbury monitors these lakes and rivers weekly during summer and the public will be advised of any changes in water quality that are of significance to public health.
Facts about cyanobacteria:
• The algae occur naturally but can increase rapidly during warmer months.
• If lake 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.
• River algae blooms appear as dark brown/black mats attached to the rock in the riverbed. These mats can detach and accumulate along the riverbanks and therefore increase the risk of exposure to toxins.
• 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 details visit: https://www.lawa.org.nz/explore-data/canterbury-region/
Or contact Community and Public Health on (03) 364 1777:
https://www.cph.co.nz/your-health/recreational-water/
For more information about Mahinga Kai:
https://www.cph.co.nz/wp-content/uploads/saf0112.pdf
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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