The link to the DES page for the “sighting” is
https://www.des.nh.gov/news-and-medi...gloeotrichia-0
It is important to note that cyanobacteria is naturally occurring, and has always existed. Gloeotrichia is a Cyanobacteria. We have noticed it all over the lake for years, especially in the early fall. It looks like tiny greenish or yellow balls suspended in the water column, and it’s that suspension that distinguishes it from pollen that floats on the surface.
It becomes a problem, and a potential health risk, when it’s heavily concentrated in a “bloom.” This DES notice is merely a sighting of Gloeotrichia, not a notice of a dangerous bloom. There is no need for alarm; they are just advising caution if you see large concentrations of it. How do you know, practically speaking, what constitutes a large concentration? The only sure way is to call DES and ask them to come and get a sample for testing, but common sense dictates awareness and caution.
One more important Cyanobacteria fact - boiling water containing Cyanobacteria releases the toxins. Living on an island, lake water is pumped into our house. For many years, we used it for cooking pasta etc Out of caution, we don’t do that anymore.
Disclaimer - I am not an expert, just a person who has read up on this topic.😀