News Video | Policy | GPs | Hospitals | Medical | Mental Health | Welfare | Search


Health warning - Glentunnel Selwyn River


February 14, 2013

Health warning - Glentunnel Selwyn River

The Community and Public Health division of the Canterbury District Health board have issued a health warning after potentially toxic blue-green algae (benthic cyanobacteria) were found in Glentunnel on the Selwyn River.

People and animals, particularly dogs, should avoid the Glentunnel Selwyn River especially downstream of the swimming hole area until the health warning has been lifted.

Dr Alistair Humphrey 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 Humphrey 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.”

Reticulated town water supplies are currently safe but 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 Alistair Humphrey says.

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

People 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 or to check where there are existing health warnings visit
Or contact Community and Public Health on (03) 364 1777.


© Scoop Media

Culture Headlines | Health Headlines | Education Headlines


Scoop Review Of Books: Before The Quakes

Remembering Christchurch: Voices from decades past: The Christchurch I lived in for my first 23 years was where four-year-olds walked alone to kindergarten, crossing roads empty of all but a couple of cars per hour. My primary school, Ilam, was newly built on a grassy paddock surrounded by rural land... More>>

6-11 October: New Zealand Improvisation Festival Hits Wellington

Wellingtonians will have a wide selection of improv to feast on with a jam packed programme containing 22 shows, three companies from Australia, two companies from Auckland, one from Nelson, one from Christchurch and seven from Wellington. More>>


Bird Of The Year: New Zealanders Asked To Vote For Their Favourite Native Bird

Te Radar, David Farrier, Heather du-Plessis Allan and Duncan Garner are just some of the New Zealanders championing their favourite native bird in Forest & Bird’s annual Bird of the Year competition, which kicks off today.. More>>


Werewolf Film: It Follows - Panic In Detroit

Philip Matthews: When you heard last month that Wes Craven had died and you wanted to pay homage, you could have sat down with any one of five of his films that helped reinvent American horror at least three times over three decades... Or you could just have watched one of the greatest recent horror films that would probably not exist without Craven. More>>


Werewolf Music: Searching For The White Wail - On Art Pepper, etc

If the word ‘hipster’ means anything – which it arguably doesn’t – it seems to be more of an impulse than a condition. One always headed for the margins, and away from the white-bred, white-bread mainstream... More>>


Scoop Review Of Books: Leonardo da Vinci - The Graphic Work

The breadth of da Vinci’s work is incredible: from animals to weaponry, architecture to fabric, maps to botany. The works have been divided into themes such as Proportion Drawings, Anatomical Drawings and Drawings of Maps and Plans. Each section begins with a short essay. More>>

Scoop Review Of Books: James Hector: Explorer, Scientist, Leader

Publication of this comprehensive 274-page account of the life and work of James Hector by the Geoscience Society of New Zealand marks the 150th anniversary of James Hector’s appointment as New Zealand’s first government scientist. More>>

Get More From Scoop



Search Scoop  
Powered by Vodafone
NZ independent news