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


Potentially toxic blue-green algae found in Otago

December 6, 2012

Potentially toxic blue-green algae found in Otago

The Otago Regional Council (ORC) is warning the public to avoid contact and keep their dogs away from two popular Otago swimming locations after the discovery of potentially toxic algal blooms over the past two days.

ORC director of environmental information and science John Threlfall said Lake Waihola south of Dunedin and the upper Tomahawk lagoon contain the potentially toxic blue-green algae Anabaena lemmermannii.

This algae, which is dark green, can produce a series of toxins which are then passed to the water and can be fatal to dogs and cause illness in people.

Otago-Southland medical officer of health Dr Marion Poore said people swimming in water with increased levels of algal bloom have been known to develop allergic reactions: asthma, eye irritations, rashes, blistering around the mouth and nose, and gastro-intestinal disorders, including abdominal pain, cramps, and diarrhoea.

People should not swim in Lake Waihola and Tomahawk lagoon, and other water users, including fishermen and boat users, should exercise caution, Dr Poore said.

Any reaction depends on the type of toxins present, and the concentration of the toxin in the water. The higher the concentration of toxins and the longer the contact with the water, the more severe the symptoms are likely to be.

Dogs are particularly susceptible to poisoning from both mat-forming and free-floating toxic algae as they enjoy being in the water and can consume these algae intentionally or by accident. Livestock are also at risk from poisoning from cytotoxins and should be provided with alternative drinking water.

Symptoms of poisoning in animals exposed to the type of toxins present in anabaena mats include lethargy, muscle tremors, fast breathing, twitching, paralysis, convulsions. In extreme cases, death can occur within 30 minutes after signs first appear.

“In the case of illness or suspected illness after swallowing water containing algal bloom, seek advice from your doctor. If your animals become sick, contact your veterinarian immediately," Dr Poore said.

ORC will put out warning signs at the locations where the algae has been found and will continue to monitor the situation.


© Scoop Media

Culture Headlines | Health Headlines | Education Headlines


Scoop Review Of Books: Worldly And Unworldly

"Being Magdalene" by Fleur Beale The situations shown in this youth novel are shocking, scary, and very moving as we experience Magdalene’s struggle to be a perfect girl as defined by the cruel and unreasonable leader of “The Children of the Faith”, as she moves reluctantly into young womanhood. More>>

Whistle Stop: Netball NZ To Implement New INF Rules

Netball New Zealand (NNZ) will implement the new Official Rules of Netball, as set down by the International Netball Federation (INF), from January 1, 2016. Key changes include the elimination of whistle following a goal, amendments to injury time and changes to setting a penalty. More>>


Scoop Review Of Books: Waiata Aroha

Vaughan Rapatahana on Chappy by Patricia Grace: With this eminently readable novel Patricia Grace returns to the full-length fiction stage after a hiatus of ten years. More>>

'Ithaca' At Q Theatre: Introducing NZ's World Class Cirque Troupe

NZ’s very own cirque troupe is set to become a household name with the premier of its adaptation of Homer’s Odyssey having secured a key season in Auckland. More>>

Music Awards: The Tuis Are Broody This Year

Topping off a sensationally eventful year both at home and internationally, Nelson born brother-sister duo Broods has taken home four Tuis from this year’s 50th annual Vodafone New Zealand Music Awards. More>>


Sport: Richie McCaw Retires From Rugby

Richie McCaw has today confirmed he is hanging up his boots and retiring from professional rugby. The 34-year-old All Blacks captain and most capped All Black of all time has drawn the curtain on his stunning international career which started in Dublin 14 years ago, almost to the day, and ended in London last month when he hoisted the Webb Ellis Cup aloft for the second time. More>>


John McBeth: On Jonah Lomu

For many New Zealanders, the enormity of Jonah Lomu's reputation will have come as a surprise... His deeds were watched and enthused over by movie stars and musicians, politicians and superstars from other codes. He reached into the lives and homes of millions and mixed with famous people most New Zealanders would only have read about. More>>


Get More From Scoop



Search Scoop  
Powered by Vodafone
NZ independent news