Source: Environment Canterbury Regional Council
Toxic algae – know what to look for
Toxic algae (cyanobacteria) are naturally occurring with the potential to bloom and may produce toxins that can harm people and pets.
Blooms form when cyanobacteria grow quickly, usually due to changes in environmental conditions such as warmer temperatures, sunlight, high levels of nutrients, or stable river flows.
“Unfortunately, dogs love the musty smell of toxic algae and are naturally drawn to investigating it – usually by licking or ingesting the material. It can be quick acting and fatal to dogs,” said Hayward.
The best way to protect yourself, whānau and pets is to know what toxic algae looks like and avoid it.
“Look for toxic algae because small amounts can be present in a waterway that is listed as good for people to swim, or you may be visiting an unmonitored area.”
In rivers, benthic cyanobacteria usually grow on the bottom of riverbeds. It appears as thick dark brown or black mats that have a slimy or velvety texture and a strong musty smell. These mats can detach and gather at the river’s edge.
In lakes, ponds and lagoons, planktonic cyanobacteria are usually suspended in the water. Water can look cloudy, discoloured, or like it has small globules in it.
