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Health Warning – Algal Bloom in the Ashley River

Health Warning – Algal Bloom in the Ashley River near Rangiora-Loburn Bridge


The Community and Public Health division of the Canterbury District Health Board has issued a health warning after a moderate cover of potentially toxic blue-green algae (benthic cyanobacteria) were found in the Ashley River near the Rangiora-Loburn Bridge.

There are also other access points along the Ashley River that may have a moderate cover of cyanobacteria present and people are advised to check for cyanobacteria and avoid contact if present.

People and animals, particularly dogs, should avoid the area of the Ashley River near the Rangiora-Loburn Bridge 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.”

“No-one should drink the water from the river at any time, even after boiling the water from the river, it does not remove the toxin therefore should not be consumed,” Dr Pink says.

Pets should be taken to a vet immediately if they are showing signs of illness after coming into contact with algal mats,

People and animals should remain out of the 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/

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