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

 


Otago Public Reminded About Toxic Algal Blooms

MEDIA RELEASE

December 21, 2012

Otago Public Reminded About Toxic Algal Blooms

The Otago Regional Council (ORC) and Public Health South are reminding the public to keep their distance from some popular swimming locations in Otago because of potentially toxic algal blooms. The two organisations have reiterated their earlier warning of December 6 for people not to come in contact with the water in these places.

ORC director of environmental information and science John Threlfall said it has been confirmed that Lake Waihola south of Dunedin, the upper Tomahawk lagoon, and the lower Taieri River near Henley, contain the potentially toxic blue-green algae Anabaena lemmermannii. However, it could be present in other areas as well.

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. The degree of toxicity is impossible to predict, but a test carried out on a sample from Lake Waihola showed that no toxins were present at that time at that point.

Southern District Health Board 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 areas affected by the algae, 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. It is difficult to know whether toxins are present at any one time or location, therefore a precautionary approach is strongly recommended.

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 has put out warning signs at the locations where the algae has been found, but not all sites will be known.

Dr Poore says her office has received a number of calls from the public concerned about the safety of eating fish caught in these waters.

“Unfortunately, there is very little information about the potential toxic effects of eating fish caught from waters with a cyanobacteria bloom,” she said.

Some algae toxins have been found to accumulate in fish tissues, especially in the internal organs such as the liver and kidneys. Toxin accumulation studies suggest that the muscle (fillet) tissue is less affected by algae toxins.

Dr Poore said people choosing to eat fish caught from waters affected by a blue-green algae bloom should use gloves when removing the fat, skin, and organs before cooking, and be careful not to cut into the organs.

Before cooking or freezing the fish, the fillets should be rinsed with clean water to remove any contaminants from the cleaning process.

It is also important to wash all equipment in clean water afterwards.

“As a precaution, we advise against eating any freshwater shellfish such as kakahi or freshwater mussels,” Dr Poore said.

“For those people who eat a lot of fish taken from cyanobacteria bloom-affected waters there is a potential risk of accumulation of toxins in their system. Limiting the number of fish meals to two per week will help avoid this situation,” she said.

ENDS

© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

Greens: Russel Norman To Stand Down As Co-Leader

Green Party Co-leader Dr Russel Norman has announced today that he will stand down as leader at the party’s Annual General Meeting in May. Dr Norman will remain as Co-leader and retain his finance and climate change portfolios until the AGM.

“After nearly a decade as Co-leader, now is a good time to find a new challenge for myself, and to spend more time with my family” said Dr Norman.

“This is my ninth year as Co-leader and I think it’s time for a change. Now is a good time for new leadership for the Party. My replacement will start from a strengthened base and will have a full parliamentary term to establish himself in the role and take the Greens into government in 2017." More>>

 

Gordon Campbell: On The Eleanor Catton Rumpus

If anyone was in doubt about the accuracy of the comments made in India by Eleanor Catton, the reaction from some quarters here at home has gone a long way to proving her point… More>>

ALSO:

More Rent Assistance, Less State-Owned Housing: John Key Speech - Next Steps In Social Housing

"We are going to ensure that more people get into social housing over the next three years, whether that is run by Housing New Zealand or a community provider. The social housing budget provides for around 62,000 income-related rent subsidies a year. We are committed to increasing that to around 65,000 subsidies by 2017/18, which will cost an extra $40 million a year." More>>

ALSO:

The Future Of Work: Andrew Little - State Of The Nation 2015

In 2005 when I led the EPMU we worked together with Air New Zealand to find a way to keep engineering jobs that were heading overseas. A lot of these workers were people I’d known for years and they were facing not just losing their jobs but not being able to find the kind of work they do without going overseas. A lot of people were facing personal and financial upheaval.... More>>

ALSO:

Gordon Campbell: On The Sabin Case, The Pressures On Greece And (Songs About) Coyotes

Mike Sabin is a National MP, and the current chairman of Parliament’s law and order committee. Yet reportedly, he is being investigated by the Police over an assault complaint... However, the PM will not comment on any aspect of the story. More>>

ALSO:

Houses, ISIS, King (& Catton): PM Post-Cabinet Press Conference

The Prime Minister met with reporters to discuss: • Social housing, the Auckland housing market • The prospect of joining international forces to combat ISIS • David Bain’s compensation • The lowering of the flag for the King of Saudi Arabia's death ... More>>

ALSO:

Gordon Campbell: On Tomorrow’s Speeches By John Key And Andrew Little

The Key government has already kicked off the political year on a stridently ideological note, with Environment Minister Nick Smith choosing to lay all manner of sins at the door of the RMA. Tomorrow, the government will wheeling out its best salesman – Prime Minister John Key – to sell its plans for state housing… . More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news