California Blackworms
Lumbriculus variegatus, also known as the California Blackworm, is a species of worm inhabiting shallow-water marshes, ponds, and swamps, feeding on microorganisms and organic material. An adult individual has approximately 150 to 250 segments, each of which has the ability to regenerate into a new individual when separated from the rest of the animal.
The California Blackworms rank among the best food that you can feed to your fish. Not only are they rich in protein and nutrients, but they can survive for a quite long time in a freshwater tank – which means that unlike other foods, they will never foul the water and will live until eaten by your fish.