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Common Parasites & Diseases

Flukes (Gill & Skin Flukes)

 

Symptoms: Rapid gill movement, clamped fins, excess mucus, flashing.
Cause: Gyrodactylus (skin) and Dactylogyrus (gill) flatworms.
Treatment:

  • Praziquantel (safe and effective).
     
  • Fluke-M or Fluke-Solve are good options.
     
  • Repeat after 7 days to kill hatching eggs.

Costia (Ichthyobodo)

 

Symptoms: Heavy mucus, lethargy, clamped fins, rubbing, gray film on skin.
Treatment:

  • Formalin–malachite green products (like ProForm-C).
     
  • Salt baths (0.3% solution) can help mild cases.

Trichodina

 

Symptoms: Flashing, excess mucus, reddened skin patches.
Treatment:

  • Formalin–malachite green or potassium permanganate.
     
  • Often linked to poor water quality, so clean pond/filter thoroughly.

Saprolegnia (Sap Fungus)

 

 Symptoms: White or gray cotton-like growth on skin, fins, or gills — often appears after injury or in cold, poor-quality water.

Treatment: 

Clean affected area with Betadine or hydrogen peroxide; treat with malachite green or a mild salt bath; improve water quality and reduce stress. 

Anchor Worm & Fish Lice

 

 

Symptoms: Visible worms (anchor worms) or disc-shaped lice on skin; irritation and redness.
Treatment:

  • Dimilin, CyroPro, or Anchor’s Away.
     
  • Manually remove visible parasites if few, then treat the whole pond.
     
  • Clean filters and vacuum pond bottom afterward.

Columnaris (Cotton Mouth / Saddleback Disease)

 

 

 Symptoms: White or gray patches around mouth, gills, or fins; frayed fins; ulcers; lethargy.
Remedy: Treat with antibacterial treatments like Aquafuran, Furan-2, or Kanamycin; improve water quality, reduce stress, isolate sick fish if possible. 

Aeromonas Bacteria

Aeromonas Bacteria

Aeromonas Bacteria

 

 Symptoms: Red sores or ulcers, fin rot, hemorrhaging, lethargy, sometimes septicemia.
Remedy: Use antibacterial treatments (Furan-2, Kanamycin, or Aquafuran), isolate sick fish, maintain excellent water quality, and reduce stress. 

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