Is cyanobacteria zooplankton

No, cyanobacteria are not zooplankton; they are a type of photosynthetic bacteria often referred to as blue-green algae. While zooplankton are small, drifting animals that feed on phytoplankton and other microorganisms, cyanobacteria are primary producers that convert sunlight into energy through photosynthesis. They play a crucial role in aquatic ecosystems, contributing to oxygen production and serving as a food source for various organisms.