Community and Public Health has lifted its algal bloom health warning issued for Lake Opuha. Recent surveys have shown that the quantity of potentially toxic planktonic cyanobacteria has decreased, and algal biomass is now below the levels that are of concern to public health. Canterbury medical officer of health Dr Cheryl Brunton said recent lake surveys have shown the quantity of potentially toxic planktonic cyanobacteria has decreased and algal biomass is now below the levels that are of concern to public health. “The public will be informed if testing shows that concentrations have increased and there is a risk to public health again,” Brunton said. Facts about cyanobacteria:• Planktonic cyanobacteria are suspended in the water column or form surface scums on the water, often near the shore.

Source: Stuff July 20, 2021 00:33 UTC