blue-green algae (phytoplankton) blooming in lake water

algae phytoplankton bloom lake water pollution cyanobacteria dirty colony ecology blue green toxic bacteria global nature environment problem harmful algal surface color microcystis aeruginosa dojran stink cyanophycea bubble floating background growth chlorophyll microorganism fresh summer hot covered top view flat lay closeup texture freshwater polluted environmental flora microscopic concept bicrobiology weather blue-green blooming grow close-up