500 kg to 1 ton. Generally, a ton of bean dregs can raise about 500 Jin to 1 ton of earthworms, which depends on the quality of bean dregs and the variety of earthworms. Because each kind of earthworm has different reproductive ability and adaptability to the environment, it is necessary to choose high-quality varieties suitable for local climate and environmental conditions, which have strong reproductive ability and high nutritional value of meat.