Algal bloom discovered in Waipara River

A field visit has confirmed the potentially toxic algae Phormidium is no longer present on the Waipara River.
About 14% of the Waipara River bed near Stringers Bridge was earlier found to be affected, with black mats detaching and floating on the surface in shallow waters or settling on the river’s edge. 


Algae (photo courtesy of Cawthron Institute, Nelson)

Phormidium is a thick dark brown or black algae that attaches to rocks on the river bed. It can be toxic to humans and animals if ingested. It exudes a musty smell which is attractive to dogs who are particularly susceptible to poisoning if they eat the algae.

Refer to Environment Canterbury for updates and additional information.