Algal Bloom in Rakahuri/Ashley River at the Rangiora-Loburn Bridge

Nicole Mathewson Reporter from Northern Outlook

From the Canterbury District Health Board:
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Community and Public Health has issued a health warning for the Rakahuri/Ashley River at the Rangiora-Loburn Bridge.

The warning follows identifying moderate to high cover of potentially toxic blue-green algae (benthic cyanobacteria) in the Rakahuri/Ashley River at the Ranigora-Loburn Bridge.

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

People and animals, particularly dogs, should avoid the area of the Rakahuri/Ashley River at the Rangiora-Loburn Bridge until the health warning has been lifted.

Canterbury medical officer of health Dr Ramon Pink said the algae looked like dark brown to black mats and could produce toxins harmful to people and animals.

“Exposure may cause skin rashes, nausea, stomach cramps, tingling and numbness around the mouth and fingertips," he said.

“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.”

Pink said people and animals should remain out of the waterways until the warnings had been lifted.

Reticulated town water supplies are currently safe but no-one should drink water from the river at any time

Pets that show signs of illness after coming into contact with algal mats should be taken to a vet immediately.

Environment Canterbury is monitoring the sites and the public will be advised of any changes in water quality.