Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search


Potentially Toxic Blue-Green Algae Reappears In Otago


January 30, 2013

Potentially Toxic Blue-Green Algae Reappears In Otago

The Otago Regional Council (ORC) is warning the public to avoid contact and keep their dogs away from Lake Waihola, south of Dunedin, after the reappearance of potentially toxic blue-green algae.

ORC director of environmental information and science John Threlfall said following the all clear earlier in the month, the potentially toxic blue-green algae Anabaena lemmermanni had come back to the lake.

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.

It was discovered in Lake Waihola and at Tomahawk Beach in early December, but had recently been given the all clear.

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 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

Parliament Headlines | Politics Headlines | Regional Headlines



Wellington.Scoop: Serco – First The Prisons, And Now It Wants To Run The Trains

As the government continues its inquiry into Serco’s discredited administration of Mt Eden prison in Auckland, here in Wellington there’s further scrutiny of the British outsourcing company – because it’s competing to take over the running of our commuter trains. More>>


Gordon Campbell: On The TPP Countdown, And Mary Margaret O’Hara

To date, the Key government has been unwilling to share any information about this TPP deal until it is too late for outraged public opinion to affect the outcome... the disclosure process is likely to consist of a similarly skewed and careful exercise in spin. More>>


Australia Deportations: English Relaxed On Immigration Centre Conditions

Labour's Annette King: “There have been numerous reports from inside these detention centres on just how bad conditions are... If they were being held in any other foreign jail, I imagine Mr English would be somewhat concerned. More>>


Schools: Achievement-Based Funding Would Be A Disaster

The Education Minister’s speech to the PPTA Conference raising the spectre of achievement data driving a new funding system would be disastrous, says NZEI Te Riu Roa. More>>

  • Video Out-Link - PPTA Annual Conference 2015 on Livestream (Q+A dicussion suggests funding would be directed to less successful schools.)

  • ALSO:

    ECE Report:

    Key In NY: Prime Minister Addresses United Nations

    Prime Minister John Key has addressed the United Nations General Assembly in New York, focusing on a call for action in Syria and on other conflicts, reform of the veto process and on the UN’s Sustainable Development Goals. More>>.


    Gordon Campbell: On The Lack Of Accountability Over Philip Smith

    In New Zealand, accountability is an exotic creature rarely glimpsed at ministerial level, or among senior management. The flight to Rio by the paedophile /murderer Philip John Smith/Traynor is no exception. More>>


    More On Corrections

    Get More From Scoop



    Search Scoop  
    Powered by Vodafone
    NZ independent news