What is plankton? What is its significance in the life of a reservoir?

Zooplankton are heterotrophic organisms that live in the aquatic environment. They cannot resist the current and soar in the water column, and their size can vary widely.

Zooplankton includes small crustaceans, some fish, jellyfish, as well as the larvae of some animals, etc.
Plankton plays an important role in the life of the ecosystem of the reservoir. It is food for many inhabitants, for example, for fish. Also, zooplankton, as a rule, feeds on phytoplankton, due to the excess of which water bloom can begin.