Water quality testing would be the best approach.
When oxygenated blood is not delivered in a timely manner, the tissue will start to malfunction. oxygenated blood not delivered on time may be caused by hypoventilation, which is very dangerous and lethal. which will also result to high concentration carbon dioxide of the body
Colonies of cyanobacteria benefit aquatic organisms because they can be an important source of food to organisms.
The problem with cyanobacteria is that they can be harmful and in an alga bloom then can cover the surface cutting off any light to other plants and producing toxins that kill fish and other life forms.
Re state a new hypithesis