Expert Answer
Koi fish do eat earthworms. They are bottom-dwelling omnivores, capable of consuming both animal-based and plant-based food. Earthworms are one of their preferred food sources.
In spring and autumn, koi fish tend to consume a large amount of high-protein food. As winter approaches, they enter a semi-dormant state.
When raising koi fish in captivity, it is advisable to feed them a high-nutrient diet in late autumn, helping them to pass through the winter more comfortably.
Koi Fish Food
- Animal-based feed: Koi fish are omnivores and particularly enjoy animal-based feed. Common examples include small fish, shrimp, snails, plankton, and other organic organisms. These foods are rich in protein and fat, which are beneficial for the growth and development of koi fish.
- Plant-based feed: Koi fish also eat aquatic plants, algae, and moss. When kept in captivity, they can be fed with soybean meal, wheat bran, corn, vegetables, fruits, and other foods to provide them with essential vitamins and trace elements.
