Lumbriculus variegatus

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Black worms (often called California Blackworms®) or Lumbriculus variegatus are small worms that should only be fed when live and can be kept in the fridge to make them keep longer.

In cultured conditions grows up to 2.5-3.8cm (1-1.5") in length.



All aquatic animals (fish, frogs, etc.) seem to like this food. It is very readily taken.


Black worms are available by mail order directly from Aquatic Foods, in USA aquarium stores, or from other USA fish keepers. It doesn't appear to be available outside the USA.

Live form

Rinse daily to keep the culture from going bad and harming your fish.


Black worms are much more difficult to culture than most other forms of live food, however they can be cultured with some success in a 10 gallon aquarium. A substrate such as brown paper towels can be used for the worms to live in and eat once it starts to decay. Aeration is required, and water level should be kept to a few inches to maximize the amount of oxygen in the water, since worms will live on the bottom. It is often difficult to achieve the same amount of yields as other forms of live food, but they may reproduce asexually under these conditions. However, the possibility of keeping the worms with another live food such as also culturing daphnia int he same container makes the effort of culturing them much more bearable.

Frozen form

Special Notes


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