Infusoria
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Infusoria is a collective term for minute aquatic creatures like Ciliate, Euglena, Paramecium, Protozoa and unicellular Algae that exist in freshwater pond water. However, in formal classification microorganism called Infusoria belongs to Kingdom Animalia, Phylum Protozoa, Class Ciliates (Infusoria).
Aquarium use
Infusoria is used by owners of Aquariums to feed fish fry. (Gourami fry and tadpoles being just two examples which will require this food to survive the first few days.)
However there is usually not enough infusoria in the average Aquarium tank to feed the newly hatched animals.
To make Infusoria, you take a handful of hay or dry leaves and place it into a jar, fill the jar with water from your tank or a pool of water. Leave in the sun for a few days.
When the water just starts to get cloudly with infusoria creatures then it is ready. You can then extract these creatures for feeding to your fry with a Turkey baster for example.
External links
Types of Protozoans and video (http://www.microscopyu.com/moviegallery/pondscum/)