Often blooms go through a cycle green first , then brown - different species blooming. If the bloom is heavy you can get that goo look (see duck pic). That is caused by burst and or dead plankton cells in their diurnal cycle. It is cytoplasm. The jellylike material that makes up much of a cell inside the cell membrane, and, in eukaryotic cells, surrounds the nucleus. I have little concern with the pics above until the last one which is different.

Last edited by ewest; 05/13/21 10:49 AM.