Understanding the Operational Reality of Harmful Algal Bloom Management in New Zealand Lakes Every New Zealand bloom season reintroduces the same operational challenge for regional councils and lake managers: how to manage cyanobacteria and harmful algal blooms (HABs)  in a way that protects lake water quality  without triggering secondary environmental stress. Cyanobacteria dominance affects more than surface appearance. It influences chlorophyll-a levels, pH stability, diss