anureetturna
the small and microscopic organisms drifting or floating in the sea or fresh water, consisting chiefly of diatoms, protozoans, small crustaceans, and the eggs and larval stages of larger animals. Many animals are adapted to feed on plankton, especially by filtering the water. "prawns change their diet from plant plankton to animal plankton"
“Plankton” term is used for all the organisms found in marine as well as freshwater, which are non-motile and cannot swim against the water current. They are drifted by water currents. Plankton is collectively used to refer to organisms such as bacteria, algae, crustaceans, protozoans, coelenterates and molluscs and members from other phylum as well.
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"prawns change their diet from plant plankton to animal plankton"