FISH DISEASES: SKIN DISORDERS

 
 

Fish Q&A Section:  Skin Disorders

 

Q:  One or several of my fish have a slimy covering on their skin in certain spots.

IN FRESHWATER KOI PONDS, USING TOO MUCH SALT WILL CAUSE THE FISH TO PRODUCE MORE SLIME! KEEP SALT LEVELS AT 0.1% OR LOWER.

A:  In Freshwater Fish:  This is a Protozoan infestation called Chilodonella.  This is common in Discus and Angelfish.

Treatment:  Treat the fish with Quinine Sulfate or Forma-Green

A:  In Saltwater Fish: This is Brooklynella Hostilis

Treatment:  Treat the fish with Quinine Sulfate or Forma-Green in a hospital tank for 5-7 days.

Q:  The fish's skin has a hazy white covering over it in patches.  It looks like a fungus, but anti-fungal treatments do not work.

A:  This is a called Columnaris Disease and is caused by gram-negative bacteria.

Treatment:  Use TMP-Sulfa -or- Sulfa 4 TMP -or- Triple Sulfa Powder.

Q:  My fish looks like it is covered with a fine white sandy coating.

A: In Freshwater Fish:  This is known as Ich (Ichthyophthirius)

Treatment:  Use Forma-Green -or- Acriflavine Neutral.  If you have tried one of these treatments and it did not work, you have a resistant strain of Ich and need to treat with Quinine Sulfate for 5-7 days.

A:  In Saltwater Fish:  This is known as Cryptocaryon Irritans (Saltwater Ich).

Treatment:  Copper Sulfate is the old stand by treatment.  Forma-Green may also be used.  For stubborn strains, try some Quinine Sulfate.

Q:  My fish has white thread-like or cottony puffs on the skin.

A:  This sounds like a Saprolegnia Fungus.

Treatment:  Treat the fish with Forma-Green for 5-7 days.

Q:  My fish has small off-white to yellowish dots on the skin and scale edges.

A:  Your fish are affected by Oodinium. 

Treatment:  Use Acriflavine Neutral -or- Forma-Green -or- Copper Sulfate.

Q: The fish has bloody patches on the skin as if it were sanded or scraped off.

A:  Your fish are affected by a Costia infestation.  (Ichthyobodo).

Treatment:  Treat the fish with Forma-Green -or- Acriflavine Neutral.

Q:  My fish has pimples on it's skin with something white sticking out.

A:  This is a parasitic worm (Lernea), or Anchorworm.  Common in Goldfish.

Treatment:  Treat the fish with De-Los.

Q:  The scales on my fish are falling off.

A:  Sounds like the fish has Bacterial Hemorrhagic Septicemia.

Treatment:  Treat the fish with Oxytetracycline Hydrochloride Powder, for ten days.

Q:  My fish had a pimple on the skin, and now it is a large sore.  Other fish are covered with large sores and dying in droves.

A:  This sounds like a bacterial disorder, either Aeromonas bacteria or Pseudomonas bacteria.  This disorder is common in Koi ponds.

Treatment:  Use Koi Fix®, or you can use a combination of Oxytetracycline Hydrochloride + Oxolinic Acid Powder on the fish for a two week treatment.  These medications can also be used in the feed (suggested).  If used in the feed, add Forma-Green to the water.  Bumping up the temperature to 80 degrees fahrenheit has shown to speed up this treatment.

 

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