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Algae are natural inhabitants of every healthy waterway, but warm temperatures, sunlight and excess nutrients can quickly turn a normal population into a bloom. Whether the problem looks like stringy green mats clinging to rocks, water turning the colour of pea soup, or a toxic blue-green scum drifting toward the shoreline, the underlying drivers are the same — and so are many of the treatments. Below is a quick guide to the three types of algae most commonly found in New Zealand lakes and ponds. Click through to each section for detailed identification, treatment options and product recommendations.
Stringy green mats that look like wet wool, clinging to rocks or floating in rafts.
Water turned green, blue-green or pea-soup caused by a microscopic algae bloom.
Foam, scum or coloured mats that can be toxic to people, pets and livestock.
Cyanobacterial blooms are a significant public health issue, particularly in summer Cyanobacteria (blue-green algae) produce a variety of toxins such as hepatotoxins, neurotoxins and dermatoxins which are detrimental to human and animal health.
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