River health warning

A health warning has been issued for the Waihao River at Gum Tree Rd and Bradshaw Bridge. The warning, from Te Mana Ora Community and Public Health, follows moderate to high cover of potentially toxic algae (benthic cyanobacteria) in the area. People should avoid the area and animals, particularly dogs, should not be allowed near the water until the health warning has been lifted. As there are other access points along the Waihao River where benthic cyanobacteria may be present, people are advised to treat every low-flowing river cautiously, check for the presence of benthic cyanobacteria and avoid contact. Te Mana Ora National Public Health Service medical officer of health Dr Matthew Reid said the algae looks like dark brown to black mats and can produce toxins harmful to people and animals. ‘‘Exposure may cause skin rashes, nausea, stomach cramps, tingling and numbness around the mouth and fingertips,’’ Reid said.