Lumbriculus variegatus, an oligochaet which is a close relative of the earthworm and is known by the common name California Blackworm. Its high ranking is due to these factors: it can be very easily cultivated, it is robust when being transported or stored, and it has a high nutritional content. But only when you have seen the hunting reflexes of even well-fed fish eating live Blackworms, will you understand its great popularity. We breed California Blackworms in closed aquaculture systems and feed them apple pomace and soy flour only, so that this high value fish food is guaranteed to be free from parasites, environmental toxins or other pathogens. Its high protein content promotes the growth of fry and gonad development in breeder fish.