It must be managed properly to achieve good fish production. Fertilizers increase fish yields. All green plants need light, proper temperature and nutrients for growth.
Manure contains the same nutrients.
They are released and become available to phytoplankton during and after decomposition. As phytoplankton assimilate fertilizer nutrients and reproduce to form dense communities pond water turns a greenish or brownish color. This is called a phytoplankton bloom. Viewing phytoplankton in a drop of pond water under a microscope. Viewing zooplankton in a jar of pond water through a magnifying glass.