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

Gordon Campbell: On Populism And Labour 2017

For many people on the centre-left, populism is a dirty word, and a shorthand for the politics of bigotry. In this country, it has tended to be equated with the angry legions of New Zealand First. Who knew they were not just a reactionary spasm, but the wave of the future?

Certainly, at the end of this week, the next US President will have won office (at least in part) thanks to his proven ability at (a) scapegoating refugees and migrants (b) wooing neo-Nazis and racial supremacists (c) attacking journalists and judges (d) threatening to jail his opponents (e) urging nuclear proliferation and (e) by promising to restrict women’s rights to control their own fertility.

On the face of that campaign record, there wouldn’t seem to be much in common between Donald Trump and say, Spain’s centre-left populist party, Podemos. Yet arguably, the similarities could be instructive for the Labour/Green partnership here. More>>

 
 

Oxfam: 30% Of NZ Owns Less Wealth Than Our Two Richest Men

The research also reveals that the richest one per cent have 20 per cent of the wealth in New Zealand, while 90 per cent of the population owns less than half of the nation’s wealth. The research forms part of a global report released to coincide with this week’s annual meeting of political and business leaders at the World Economic Forum in Davos, Switzerland. More>>

ALSO:

Hospitals: Resident Doctors Set To Strike Again

Despite discussions between the DHBs and NZRDA over safer hours for resident doctors progressing during the last week, the strike planned for next week appears set to proceed. More>>

ALSO:

Not So Super Fund: More Burning Ethical Questions For Steven Joyce

Greens: Radio New Zealand reported this morning that the New Zealand Superfund has $77 million invested in 47 coal companies that the Norwegian Government’s Pension Fund – the largest sovereign fund in the world – has blacklisted. More>>

Activism: Greenpeace Intercepts World’s Biggest Seismic Oil Ship

Greenpeace crew have made contact with the world’s biggest seismic oil ship after travelling 50 nautical miles on two rigid-hulled inflatables off the coast of Wairarapa... Greenpeace radioed the master of the Amazon Warrior to deliver an open letter of protest signed by over 60,000 New Zealanders. More>>

ALSO:

Gordon Campbell: Why Tax Cuts In 2017 Would Be A (Proven) Bad Idea

Ever since the world fell prey to the mullahs of the free market in the 1980s, no amount of real world evidence has managed dispel one key tenet of their economic faith. Namely, the idea that if you cut income taxes and taxes on small business, a wave of individual enterprise and entrepreneurial energy will thus be unleashed, profits will rise and – hey bingo! – the tax cuts will soon be paying for themselves ... More>>

Liquor Sponsorship: Researchers Call For Ban On Alcohol Sponsorship Of Sport

“Due to alcohol sponsorship of sport, New Zealanders, including children, were exposed to up to 200 ads per hour they watched televised sport, and people watching football and tennis saw alcohol ads for almost half of each game,” says Associate Professor Signal. More>>

ALSO:

Mt Albert: Ardern For Labour, Genter For Greens

At the close of nominations, Jacinda Ardern was the sole nomination received for the position of Labour’s candidate for the Mt Albert by-election, says Labour General Secretary, Andrew Kirton. More>>

ALSO:

Earlier:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news