Panagrellus redivivus

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Panagrellus redivivus
Panagrellus redivivus Otago University Cold Stage.jpg
Observation of Panagrellus redivivus on a Zeiss microscope stage
Scientific classification
Kingdom: Animalia
Phylum: Nematoda
Class: Secernentea
Order: Rhabditida
Family: Panagrolaimidae
Genus: Panagrellus
Species: P. redivivus
Binomial name
Panagrellus redivivus
L.

The free-living nematode Panagrellus redivivus (sour paste nematode) is known to many aquarium enthusiasts and fishkeepers as the microworm. It is a tiny roundworm used as the first food for minuscule newly hatched fish, such as the popular pet fish betta. The microworm is widely used in aquaculture as food for a variety of fish and crustacean species.

The microworm is about 50 μm in diameter and just over 1 mm in length, barely visible to the naked eye. It is easily cultured at home on a substrate of flour or porridge.[1]

The microworm has been used in genetic analysis studies, but not nearly as universally as its relative, Caenorhabditis elegans.

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