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A bloodworm, greatly enlarged, showing its scarlet hemoglobin contents. Jasper Nance/GNU

Bloodworms are a rich food often used to promote conditioning and reproduction in aquarium fishes. They are high in protein and fats and are a good source of iron.

They are the larvae of a non-biting mosquito-like midge (Family Chironomidae) with a scarlet red coloration deriving from their hemoglobin content. In the wild, they occur in muddy bottoms of streams, ponds, and swampy areas.

Bloodworms are available live, frozen, and freeze-dried.