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

 


ORC warns of possible emergence of toxic algal bloom

MEDIA RELEASE


December 3, 2012

ORC warns of possible emergence of toxic algal bloom

The Otago Regional Council (ORC) is warning people to be wary of the possible presence of toxic algae in rivers and lakes throughout the Otago region this summer.

ORC director of environmental information and science John Threlfall said toxic algae occurs naturally in a wide range of water quality conditions, including relatively clean waters. It is more likely to be present during the summer months than at any other time of the year.

In rivers, Phormidium is a common toxic algae which typically forms a thick brown-black slimy algae mat found on large rocks, stones, and cobbles, Dr Threlfall said

If the mats detach, they may float downstream to become caught up in other debris such as sticks. When the Phormidium mats die and dry out, they become light brown or white. Either fresh or dried, it can be highly toxic and harmful to humans and animals.
This is especially true for dogs, as they are particularly susceptible to poisoning from both mat-forming and free-floating toxic algae.

“Many dogs enjoy being in the water and can eat these algae intentionally or by accident, which can have tragic results,” Dr Threlfall said.

Symptoms of poisoning in animals exposed to the type of toxins present in Phormidium mats include lethargy, muscle tremors, fast breathing, twitching, paralysis, and convulsions. In extreme cases, death can occur within 30 minutes after signs first appear.

Toxic algal blooms are commonly blue-green in lakes or still water, but can also be red or yellow.

They typically form thick scums on the surface, and may also develop foams at the water's edge. In Otago toxic algal blooms in lakes do not occur regularly.

If an algal bloom is present, people have been known to develop allergic reactions such as asthma, eye irritations, rashes, blistering around the mouth and nose, and gastro-intestinal disorders, including abdominal pain, cramps, and diarrhoea.


Dr Threlfall said any reaction depends on the type of toxic algae, the type of toxins present, and the concentration of the toxin in the water.

“The higher the concentration of algae toxins and the longer the contact with the water, the more severe the symptoms are likely to be,” he said.


Where humans become ill or are suspected of being ill after swallowing water containing algal bloom, medical advice should be sought immediately. Likewise, if animals become sick, a veterinarian should be contacted.


© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

EPA: Board Of Inquiry Rejects Basin Flyover By Majority Of 3 To 1

The independent Board of Inquiry delegated to decide on the Basin Bridge Proposal has, by a majority decision (3 to 1), cancelled the Transport Agency’s Notice of Requirement and declined its resource consent applications for the construction, operation and maintenance of a flyover on State Highway 1 in Wellington City between Paterson Street and Buckle Street/Taranaki Street...

Parties specified under Section 149Q(3) of the RMA now have 20 working days to make comments on minor or technical aspects of the report. More>>

 

Parliament Today:

Red Tape: Local Regulations Go Under Microscope

The Government says it is accepting nearly all of the recommendations the Productivity Commission has made on ways to improve local regulations. More>>

ALSO:

Spending Questions: Claudette Hauiti To Step Aside At Election

National Party President Peter Goodfellow confirms that he has received notification from List MP Claudette Hauiti that she plans to step aside at the 20 September election. More>>

ALSO:

Gordon Campbell: On The Non-Apology To Tania Billingsley

The refusal by Prime Minister John Key to issue a personal apology to Tania Billingsley has been accompanied by an array of excuses... Yesterday though, Key’s choice of words indicated that an apology was the last thing on his mind. More>>

ALSO:

Conventions: Winston Peters On The Nation

Winston Peters opens door to standing in East Coast Bays electorate, says it's an "exciting point" and he's thinking about it. "I’ve had a whole lot of people writing to me and calling up and saying ‘why don’t you have a go in East Coast Bays’." More>>

ALSO:

Waitangi Tribunal: Report On The MV Rena

In its interim report, the Waitangi Tribunal has found that the Crown’s conduct in response to the grounding of the MV Rena on Otaiti (Astrolabe) reef breached the principles of the Treaty of Waitangi. More>>

ALSO:

Gaza: Wellington Protest For Palestine Calls For End To Bombing

Around 300 people gathered outside the Israeli Embassy in Wellington on Friday to protest Israel’s occupation of Palestine. More>>

ALSO:

Gordon Campbell: On The Failure To Prosecute The GCSB

So one hand of the state – the Independent Police Conduct Authority – has now washed the hands of its brother agencies, and declared that all hands are clean. Case closed. More>>

ALSO:

Illegal Search: Police Behaviour 'Reminiscent Of Tūhoe Raids'

"Māori will lose further trust and confidence in the New Zealand Police and the Independent Police Conduct Authority (IPCA) if the recent incident in Stratford is not adequately addressed. This behaviour would not occur in Epsom or Khandallah so why should police think that such behaviour was acceptable in Stratford," says Chris McKenzie. More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news