Blue-Green Algae

Blue-green algae are not algae but a type of bacteria (called cyanobacteria) that are present in our lakes and rivers. 
 
They are very small and can’t be seen with the naked eye. When environmental conditions are just right (they like warm still water with plenty of nutrients), they can multiply quickly forming a “bloom” 

Blooms appear as a discolouration of the water (often a pea green colour) or as a visible scum layers or floating mats. Blooms usually occur in the summer and early autumn but can occur at other times of the year, if conditions are right.

There are no quick or easy remedies for the control of blooms once they appear in a lake or pond.