Infusoria is a name for many single cell organism.
Infusoria''s size are 40-100 mikron. This size are suitable for mouth
of fish fry. Its why
infusoria cultured for fish fry feeding.
Infusoria divided into 2 categories based on its motion. Flagellate and ciliate. Ciliate are moved using fibrating hair (cilia). Paramaecium caudatum, Didinium narutum, Calpodium capulum are includeed in this categories.
Flagellate are moved using whiping hair (flagel). Euglena viridis, Pandorina sp, Chilomonas sp are includeed in this categories.
Infusoria mostly lived in fresh water. Its feed on bacteria, smaller protozoa and yeast. Infusoria mostly found in water covered with plant because of its behavior avoiding sunlight.