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

Re-Entry: Why Has Pike Footage Been Hidden For So Long?

New footage of workers servicing a robot in the Pike River drift appears to show that going into the drift doesn’t pose the danger the Government and Solid Energy claimed, says Leader of the Opposition Andrew Little. More>>

Mines Rescue Service On Footage
The video footage shown by media in the last 24 hours shows two Mines Rescue members wearing compressed air breathing apparatus completing final tasks before a robot was sent into the main drift at the Pike River mine. More>>

Police Response: Statement On Pike River Mine Footage
Police has been absolutely committed to ensuring transparency with the families of the Pike River miners and we reject any suggestion that information has been deliberately withheld by police. More>>

 

Recovery: Economic Impact Of Kaikōura Quake Revealed

The report details the impact on small businesses and tourism caused by disruptions to transport infrastructure and the economic impacts... The impact on New Zealand’s Gross Domestic Product (GDP) over the first 18 months following the earthquake has been estimated at $450-$500 million. More>>

ALSO:

Human Rights Commission: Urgent Need For Action On Seclusion And Restraint

Chief Human Rights Commissioner David Rutherford says that while the report makes for sobering reading, the focus should now be on how the recommendations can be used to reduce the occurrence of seclusion and restraint in New Zealand and, in circumstances where it is necessary, to improve practices. More>>

ALSO:

CORRECTIONS (March 2017):

SCHOOL SECLUSION ROOMS (2016):

$11bn Capital Spend, New Debt Target: Steven Joyce On Budget Priorities

First, delivering better public services for a growing country – providing all New Zealanders with the opportunity to lead successful independent lives... And finally, we remain committed to reducing the tax burden and in particular the impact of marginal tax rates on lower and middle income earners, when we have the room to do so. More>>

ALSO:

JustSpeak Report: Bail Changes To Blame For New Billion Dollar Prison

In 2013 criminal justice spending was falling and the Government was mulling over what to spend the money on. 3 years later there are 10,000 people in prison and a new billion dollar prison is announced. More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news