Pond Boss Forums INTRO Questions & Observations bloom=oxygen?'s

The phytoplankton bloom is responsible for most of the oxygen during the day. Some is subsequently used for respiration in the pond but most typically exits water and goes into atmosphere. Oxygen is always moving back and forth between atmosphere but net importance for getting it into water is greatest at night, when sky is very overcast, and when photosynthesis of the type generating oxygen is otherwise limiting. Atmospheric oxygen also important when respiration exceeds the ability of photosynthesis to keep water saturated with oxygen. Heavily feed bodies of water can fall into this category.

Yes, your algaecide can kill off a phytoplankton bloom depending upon what species are dominant. Other species not effected. I do not know which species are impacted.