Treatment Protocol for Anchor Worm (Lernaea)
Physically remove visible worms with tweezers (apply antiseptic to wound). Treat tank with Dimilin or CyroPro to kill larvae. Salt dips (3 tbsp per gallon for 5 minutes) help. Full tank treatment needed as larvae are free-swimming.
How to Identify This Condition
Look for these symptoms in your fish:
- Visible worm-like parasites protruding from body
- Red inflamed spots at attachment site
- Rubbing against objects (flashing)
- Ulcers at infection site
Early detection is critical — the sooner you begin treatment, the better the prognosis. Observe your fish daily during routine feeding for any behavioral or physical changes.
Root Causes
Understanding what caused the problem helps you prevent recurrence:
- Lernaea copepod parasite
- Introduced through infected fish or live food
- Outdoor pond exposure
Recommended Medications
The following medications are effective against Anchor Worm (Lernaea):
- Dimilin — follow manufacturer dosing instructions. Treat in a hospital/quarantine tank when possible to avoid disrupting your main tank's biological filtration.
- CyroPro — follow manufacturer dosing instructions. Treat in a hospital/quarantine tank when possible to avoid disrupting your main tank's biological filtration.
- Aquarium salt — follow manufacturer dosing instructions. Treat in a hospital/quarantine tank when possible to avoid disrupting your main tank's biological filtration.
- Potassium permanganate — follow manufacturer dosing instructions. Treat in a hospital/quarantine tank when possible to avoid disrupting your main tank's biological filtration.
Always have these medications on hand before you need them. See our quarantine tank guide for proper treatment setup.
Water Quality During Treatment
Maintain pristine water conditions during treatment. Perform 25% daily water changes using Seachem Prime as your water conditioner. Remove activated carbon from your filter during medication (carbon absorbs medications). Increase aeration with an air stone — sick fish need extra oxygen. Monitor ammonia and nitrite daily with your test kit.
Recovery & Quarantine
With proper treatment, most fish recover within 28 days. Continue treatment for the full course even if symptoms resolve early. Reintroduce treated fish to the main tank gradually, and observe for 7 additional days.
Prevention
The best treatment is prevention. Follow these practices to reduce the risk:
- Quarantine all new fish 2-4 weeks
- Inspect fish before purchase
- Avoid wild-caught live food from ponds
- Maintain good water quality
For a complete prevention strategy, read our quarantine tank guide and maintenance schedule.