There was an interesting case in Segah River (East Kalimantan). The river starting to clear after rain (after a month of no rain) and flocs were appeared. Was it an effect of coagulation? (Be noted: the river is usually muddy)
Then the effect was more depressing in the following days, the river turned green and followed by dead fishes. The effect of cyanobacteria was considered by a local expert, did it make sense?
The river picture could be seen in the link.
I would be very grateful, if someone could give a hypothesis of this phenomenon? Thank you.
http://dinkes.beraukab.go.id/berita-sementara-jangan-konsumsi-ikan-air-tawar.html