🪱 Blackworms Care Guide (Lumbriculus variegatus)

🌟 Overview Blackworms (Lumbriculus variegatus) are a live aquatic worm commonly used as nutritious food for freshwater fish. High in protein and natural in movement, they stimulate feeding responses in even the pickiest eaters. With proper care, blackworms can be cultured and kept alive for extended use, making them a valuable food source for aquarists.

🔑 Quick Facts

• Scientific Name: Lumbriculus variegatus
• Common Name: Blackworms
• Use: Live food for freshwater fish
• Nutritional Value: High protein, stimulates growth and breeding
• Care Level: Easy with proper maintenance

🏠 Storage & Housing

• Container: Shallow container or tank with a thin layer of dechlorinated water
• Water Changes: Rinse or replace water daily with fresh, cool, dechlorinated water
• Aeration: Gentle air stone recommended if kept in larger culture tubs
• Temperature: Keep cool, ideally 45–65°F (7–18°C) for longest lifespan
• Light: Low light, avoid direct sunlight

🍽️ Feeding Blackworms

• Feed lightly with:
• Powdered fish food
• Spirulina powder
• Small amounts of blanched vegetables
• Avoid overfeeding — excess food causes fouling and die-offs

🐟 Benefits for Fish

• Excellent for conditioning fish for breeding
• Natural wriggling motion stimulates hunting/feeding instincts
• Safe for freshwater fish when properly rinsed
• Highly nutritious, supporting growth and coloration

🧠 Tips & Maintenance

• Rinse worms in cool dechlorinated water before feeding to fish
• Store excess worms in the refrigerator (in shallow water, changed daily) for up to 2–3 weeks
• Never allow worms to sit in fouled or oxygen-depleted water
• Small daily care extends their usefulness and reduces waste

❓ FAQ

Q: How long do blackworms last?
A: With daily care, they can be kept alive for 2–3 weeks.

Q: Do I need to refrigerate them?
A: Yes, refrigeration greatly extends their lifespan, though they can be kept in cool rooms.

Q: Can blackworms reproduce in my aquarium?
A: Rarely — while possible, they typically do not establish in most aquariums.

Q: Are they safe for all fish?
A: Yes, blackworms are excellent for most freshwater fish, including cichlids, loaches, tetras, bettas, and discus.