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

More Evidence - Scoop Press Conference Recordings:
PM's Post-Cab Presser 8/8/11
"at that point [Tucker] told me he'd release it ..."

Hager Revelations: Inquiry Into NZSIS Release Of Goff Docs

The Inspector-General of Intelligence and Security (IGIS), Cheryl Gwyn, announced she would be instituting an inquiry concerning allegations that the New Zealand Security Intelligence Service (NZSIS) might have released official information to Mr Cameron Slater, regarding briefings provided to the then Leader of the Opposition, for political purposes...

“I am satisfied there is a sufficient public interest justifying the commencement of an own-motion inquiry into the substance of the issues raised with my Office,” said Ms Gwyn. More>>

Goff: Director’s Letter Contradicts Key’s Claims

At yesterday’s media standup, when asked on the topic John Key said ‘I wasn’t told’...
“In a letter dated November 2011 former SIS director Warren Tucker states three times that ‘in accordance with the usual practice of keeping the minister informed’ the Prime Minister had been told. More>>


 

Parliament Today:

Schools, PPTA Sign Up: Primary Teachers And Principals Vote Down Govt Plan

Teachers and principals have voted overwhelmingly against the Government’s controversial “Investing in Educational Success” policy, including proposed highly-paid principal and teacher roles. More>>

ALSO:

Gordon Campbell: On The Usual Round Of Mud Slinging And Name-Calling

This week gave an interesting example of how hard it is to untangle the reality from the slanging matches. The issue that emerged early this week could hardly be more important. Does the government intend to cut spending in health, education and on the environment if re-elected, or not? More>>

Earlier:

Electionresults.co.nz: National and NZ First Rise in Roy Morgan Poll

National has bounced back in the latest Roy Morgan Poll but the big winner has been New Zealand First who rise to their highest level of support since September 2013. More>>

ALSO:

Fish Pun Warning: By Hoki! It’s Labour’s Fisheries Policy

A Labour Government will protect the iconic Kiwi tradition of fishing by improving access to the coast, protecting the rights of recreational fishers and reviewing snapper restrictions, Labour’s Fisheries spokesperson Damien O’Connor says. More>>

ALSO:

It's Official: Governor General Gives Direction To Conduct Election

The Governor General has signed the writ directing the Electoral Commission to conduct the General Election on 20 September 2014. This is the formal authority to run the 2014 election, and enables candidate nominations to open tomorrow Thursday 21 August 2014. More>>

Gordon Campbell: No More Mr Nice Guy

When future historians seek to identify the exact moment when the prime ministerial career of John Key hit the downward slope, they may well point to Key’s interview yesterday with Guyon Espiner on RNZ’s Morning Report. More>>

ALSO:

Dirty (Politics) Weekend: Collins’ Admission Reason For Key To Act

"Despite claiming that the evidence about her in Nicky Hager's book was ‘false’ Judith Collins has now been forced to admit that she did send information about a Ministerial Services staff member to Cameron Slater for him to use in a baseless smear campaign. More>>

ALSO:

Potential Disasters: Underground Coal Fire On Denniston Plateau

Forest & Bird says one or more coal fires have broken out beneath the Denniston Plateau, and that the Department of Conservation (DOC) must stop Bathurst Resources’ preparatory mining work going on there until the fire or fires are extinguished. More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news