False Alarm for New Zealand North Island Rivers?

Are New Zealand trout fishermen and government agencies going to get a second chance to prevent didymo from infesting North Island rivers? Maybe. “Dead cells of the invasive algae had been found in samples taken from the Tongariro, Whakapapa, Mangatepopo and Whanganui rivers, but the Ministry of Agriculture and Forestry confirmed yesterday that no living cells had shown up after microscope and dna testing.” Britton Broun on Stuff.co.nz.