16 March 2018
Health Warning – Potentially toxic algal bloom in the Selwyn/Waikirikiri River at Chamberlains Ford
The Community and Public Health division of the Canterbury District Health Board have issued a health warning for the
Selwyn/Waikirikiri River near Chamberlains Ford.
The warning follows finding a moderate cover of potentially toxic blue-green algae (benthic cyanobacteria) in the
Selwyn/Waikirikiri River.
People and animals, particularly dogs, should avoid the area of the Selwyn/Waikirikiri near Chamberlains Ford until the
health warning has been lifted.
Dr Ramon Pink, Canterbury Medical Officer of Health, says the algae look like dark brown to black mats and can produce
toxins harmful to people and animals.
“Exposure may cause skin rashes, nausea, stomach cramps, tingling and numbness around the mouth and fingertips,” Dr Pink
says.
“If you experience any of these symptoms, visit your doctor immediately, also let your doctor know if you’ve had contact
with dark brown/black algal mats or water in this area.”
Pets that show signs of illness after coming into contact with algal mats should be taken to a vet immediately.
Dr Pink says people and animals should remain out of the affected waterways until the warnings have been lifted.
Environment Canterbury is monitoring the sites and the public will be advised of any changes in water quality.
Facts about cyanobacteria:
Appears as dark brown/black mats attached to rocks along the riverbed.
The algae occur naturally but can increase rapidly during warmer months.
It often has a strong musty smell and algal toxin concentrations can vary over short periods with changing environmental
conditions.
Although high river levels will remove the algal bloom, detached mats can accumulate along the shore and increase the
risk of exposure to toxins.
If a health warning is in place avoid contact with the water.
Although district or city councils may place warning signs, these may not be seen at the numerous river access points,
hence the need for people/ dog-walkers to treat every low-flowing river cautiously.
For further information visit https://www.ecan.govt.nz/your-region/your-environment/water/swimming-water-quality/
or contact Community and Public Health on (03) 364 1777.
https://www.cph.co.nz/your-health/recreational-water/
ENDS