KEY POINTS:
The deaths of two dogs is being attributed to toxic algal poisoning from the Hutt River.
The dogs are understood to have drunk a small amount of river water, which has become infested in parts by algal mats.
Dogs are more susceptible to the blue-green alga than humans, but Regional Public Health has issued a warning to people to avoid recreational contact with the river.
The alga has appeared in the Belmont, Taita and Boulcott sections of the river.
Skin contact or swallowing the water could cause rashes, skin and eye irritation, allergic reactions, gastrointestinal upset and other effects in humans, medical officer of health for Regional Public Health Dr Annette Nesdale said.
Hutt City Council has put up temporary signs to advise people of the risk.
Dr Nesdale said that with the warm and dry conditions, other rivers may also have algal growths so it was important people had a good look at any river spots before they swam or allowed their dogs to have contact with the water. Features of algal mats are murky water, dense brown or black mats which are seen most easily on stones or at the edge of the river. Areas with algal mats often have an earthy or musty smell. If any of these features are present, contact with the river should be avoided, Dr Nesdale said.
"If any person or animal ... exhibits signs of illness after being near the river/s, contact your doctor or vet immediately."
- NZPA
