Are all blue-green algae poisonous?
– No. There are many species of blue-green algae. Some are not known to have any toxins, others have one or more different types of toxin. Species known to be toxic may only be toxic at certain times and places within the bloom. Blue-green algae are a natural part of all waterways. Under certain conditions some blue-green algae multiply to bloom levels and may produce toxins which are dangerous to livestock and humans.
