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EXTERNAL PARASITE IDENTIFICATION GUIDE
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📌 How to recognize external parasites on fish
🔹 Common Symptoms of External Parasites
- 🏊 Scratching / Flashing – Rubbing against objects (Ich, Flukes).
- 💨 Rapid Gilling & Labored Breathing – Often Gill Flukes or Velvet.
- 🎭 White Spots on Skin & Fins – Classic Ich.
- 🎭 Dusty Gold Sheen – Freshwater Velvet (Piscinoodinium).
- 🎭 Gray or Yellow Film – Marine Velvet (Amyloodinium).
- 🔴 Visible Worms or Lice – Anchor Worms or Fish Lice.
🦠 Ich (White Spot Disease)
Ichthyophthirius multifiliis
- 📍 Signs: Small white cysts on skin, fins, and gills.
- 🔍 Identification: Looks like salt grains.
- 🏥 Treatment: Heat + salt, copper sulfate, malachite green.
🦠 Velvet Disease (Gold-Dust)
Piscinoodinium (FW) / Amyloodinium (SW)
- 📍 Signs: Fine gold or brown dust on skin.
- 🔍 Identification: Shimmery velvet-like sheen.
- 🏥 Treatment: Copper meds, formalin, freshwater dips (marine).
🪱 Skin & Gill Flukes
Gyrodactylus / Dactylogyrus
- 📍 Signs: Scratching, excess mucus, gill flaring, heavy breathing.
- 🔍 Identification: Microscope confirms, symptoms are strong indicators.
- 🏥 Treatment: Praziquantel, formalin, salt baths.
🦀 Fish Lice (Argulus)
- 📍 Signs: Round, flat parasite moving on the fish.
- 🔍 Identification: Small disc with tiny legs; visible to eye.
- 🏥 Treatment: Manual removal + Dimilin, potassium permanganate.
🪱 Anchor Worms (Lernaea)
- 📍 Signs: Thread-like worms protruding from skin.
- 🔍 Identification: White or red threads from wounds.
- 🏥 Treatment: Manual removal + salt baths, Dimilin.
⚠️ Prevention Tips
- ✅ Quarantine new fish for 3–4 weeks.
- ✅ Inspect fish before purchase.
- ✅ Maintain stable water parameters.
📸 Need help identifying a parasite?
Post pictures and water parameters for assistance!
Post pictures and water parameters for assistance!