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Toxic Algae Warning As Levels Build Up In The Hutt River


Thursday 29 November 2012

Toxic Algae Warning As Levels Build Up In The Hutt River

The Greater Wellington Regional Council, local councils and Regional Public Health are urging river users to protect themselves and their dogs from toxic algae, with an increase of algal growth detected in the Hutt River this week.

Toxic algae - or cyanobacteria - forms brown or black clumps that are found in rivers and the river's edge, and can kill livestock and dogs. If your dog eats toxic algae, it can die very quickly. Contact with toxic algae can cause vomiting, diarrhoea and skin irritations in humans.

The Regional Council's weekly river monitoring has shown increased coverage of toxic algae at its Birchville, Maoribank and Silverstream monitoring sites along the Hutt River, presenting a potential risk to river users. The Hutt and Upper Hutt city councils are putting up warning signs along key access points to the Hutt River.

Summer Greenfield, Regional Council Senior Environmental Scientist, says that toxic algae occurs naturally in many New Zealand waters.

"The presence doesn't necessarily indicate poor water quality - toxic algae can be present in rivers where the water quality is good. However, there's often an increase in toxic algae during summer because it's warmer, river flows and levels are usually lower, and there's less frequent rain to flush the algae away. These are the conditions that we're already experiencing and that are likely to continue with NIWA [National Institute of Water and Atmospheric Research] forecasting an increased likelihood of below average rainfall over the next few months."

For current warnings on the toxic algae risk at popular rivers around the region, and for photos that show you what toxic algae looks like, visit the Greater Wellington Regional Council's website: www.gw.govt.nz/toxic-algae.


*HOW TO SPOT TOXIC ALGAE - Toxic algae forms brown and black clumps at the river's edge or in parts of the river where rocks are exposed or it's shallow
*IF YOU SEE A TOXIC ALGAE WARNING SIGN OR THINK YOU SEE TOXIC ALGAE - Avoid touching and swimming near toxic algae. Put your dog on a lead and move away from the river's edge
*IF YOU THINK YOUR DOG HAS EATEN TOXIC ALGAE - Take your dog to a vet immediately



Photos of toxic algae attached


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