What is infusoria?

Infusoria refers to a diverse group of microorganisms, primarily unicellular protozoa, that are typically found in aquatic environments, especially in decaying organic matter. These organisms are often used as food for small aquatic animals, such as fish fry and shrimp larvae, due to their high nutritional value. Infusoria can include various species, such as paramecia and amoebas, and are usually observed under a microscope. They play a crucial role in the ecosystem by contributing to nutrient cycling and serving as indicators of water quality.