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algae, or phytoplankton, zooplankton are microscopic animals that do not There are over 2000 species of rotifers in freshwater systems.This species lives in fresh water, occurs in rivers, ponds and lakes. Common in the Mekong River. Figure 3. Arcella hemisphaerica, lateral view. 30 μm. 1. freshwater zooplankton is significantly potential for assessing aquatic ecosystem. They are not only useful as bio-indicators.