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

Gordon Campbell:
On War Crimes And The Afghan Insurgency

Truly, with friends like former defence Minster Wayne Mapp, the SAS does not need enemies. At the very least, the Hit and Run book has raised the possibility that the New Zealand SAS committed war crimes in the attack they led in Afghnistan upon the villages of Naik and Khak Khuday Dad...

Mapp’s attempted defence of the SAS on RNZ this morning unintentionally indicated that collective punishment was baked into the planning exercise for the raid, and also into how the raid proceeded on the ground. More>>

 
 

Little Heading For Court: Apology Over Donation/Hotel Contract Claims Not Accepted

Today I want to publicly apologise unreservedly to Mr Hagaman for any hurt, embarrassment or adverse reflection on his reputation which may have resulted from my various media statements. I have offered that apology to the Hagamans. More>>

ALSO:

Biscuit Tin Of Democracy: World Heritage Site Protection, Ombudsman and Equal Pay Bills Drawn

On Thursday, 23 March 2017 three places are available on the Order Paper for the first reading of a Member’s bill. The ballot was held, and resulted in the following bills being drawn... More>>

ALSO:

Emissions Plan: NZ Needs More Science, More Trees, Fewer Beasts

A combination of technology breakthroughs, much more plantation forestry, and a big switch away from pastoral, particularly dairy farming, are identified as the key elements of any approach New Zealand takes to reducing its carbon emissions to a net zero level, according to a new report sponsored by the New Zealand chapter of GLOBE, a multi-party, global parliamentary grouping. More>>

ALSO:

"Backed To Win Seats": Labour Māori Seat MPs Won't Stand On List

The Labour Party is backing a request from its Māori seat MPs to stand as electorate MPs only, says Labour Leader Andrew Little. More>>

OutsKey: John Key's Valedictory Speech

I rise to address this House for the very last time. It has been a huge privilege to have served the people of Helensville as their member of Parliament, and, of course, the people of New Zealand as their Prime Minister. More>>

ALSO:

Productivity Commission: New Models Of Tertiary Education Are Coming

The report is a broad-ranging inquiry into how well New Zealand’s tertiary education system is set up to respond to emerging trends in technology and the internationalisation of education, and changes in the structure of the population, and the skills needed in the economy and society... More>>

ALSO:

PM's Press Conference: Water Everywhere

Monday's Post-Cabinet press conference focused on water, with the Prime Minister fielding questions about the possibility pricing water taken for export. Mr English said the government was directing their water allocation technical advisory group to include export water in considerations. More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news