Blue green algae is a big issue here around home, in fact right now one of our most popular recreational lakes has about 20 times the safe levels. I'm from a predominantly agricultural area where cropping is big and high nutrient run off from fertilizers etc accompanied by low to no rainfall and high temperatures causes the perfect conditions for them. What makes it worse compared to say a green algae in terms of its reproduction is that blue green algae is single celled and so can spread much faster.
I studied Cyanobacteria in uni and really all you can do is just wait it out. It's annoying but all you can really do is let it bloom and then die out.
It's been a couple of years since I studied this and I didn't look at the wiki article so I may be wrong on some of this stuff now. What I do know is that it doesn't take much to kill dogs, and swimming n or eating infected fish from there can make you really crook.
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