Bloodworm

Stagnant or slow-moving freshwater bodies, including ponds, lakes, and rivers, especially in bottom sediments with low oxygen levels.

Larvae feed on organic detritus, algae, and microorganisms found in water sediment.

They live in silk-lined tubes in the mud. Their red color comes from hemoglobin, which allows them to survive in low-oxygen environments. They pupate and emerge as non-biting midges.

Benefits: They are a vital food source for fish and waterfowl and help clean water by consuming organic waste. Risks: As adults, they can form large swarms, though they do not bite.