Cyanotoxin

Cyanotoxin is a bad thing that can be found in water. It is made by tiny living things called cyanobacteria. These little guys are so small that we can't even see them without a microscope!

Sometimes, there can be too many of these bacteria in the water. When they're too crowded, they produce too much cyanotoxin. When people or animals drink or swim in water that has cyanotoxin in it, it can make them very sick.

Cyanotoxin can cause all sorts of problems. If you drink water that has cyanotoxin in it, you might have a tummy ache, feel sick, or throw up. If animals drink the water or swim in it, they might get really sick or even die.

That's why it's important to test the water to make sure there isn't too much cyanobacteria in it. If the water is polluted with too many of these little guys, people can't use it until it's safe again.