Animal Stories - Fish Disease and Treatment


Animal-World Information about: Fish Disease and Treatment

Introduction to aquarium fish diseases and treatments.
Latest Animal Stories
saloni rishi - 2013-02-21
today i found a blood ulcer/wound type on my fantail goldfish near her gill but not on gill. it is bloody and has something white visible string . i saw her closely but can't say it was a parasite or what. plz help my fish is healthy eating well is in 15g tank with one oranda. she is in the tank past 3 months always healthy swimming happily.

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Sandra - 2013-02-15
All my fish have slowly died - 4 or 5 each day this week. I am going to throw the remained out and wash the tank etc and start again. Can anyone please advise me what I can use to clean the tank, filter etc, so as I make sure I remove any disease that the tank may have and not kill the fish next time I add them.

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  • Jeremy Roche - 2013-02-16
    Before breaking your tank down and cleaning it, get the water levels checked.  You can bring a sample to most pet stores.  Mass deaths like this usually happen when a tank has not been cycles or from over stocking.  What size take is it?  Where there signs of disease?
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Aman - 2013-02-02
My friend do fish farming. He is having 3 ponds. Each pond is having 30,000 cat fishes. In one pond we have traced red patches & ulcers. In another white patches. Please suggest what is to be done.

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  • Jeremy Roche - 2013-02-03
    May be an over stocking issue.  Add more filtration and check water level.
  • Aman - 2013-02-07
    Mam can i use any medicine to over come the same disease?
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Barbara Steiner - 2013-02-04
Correction: the goldfish are 6' long, not 6'.

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Barbara Steiner - 2013-02-04
A friend has 2 6' pond goldfish, each with a 'fingernail' size lump on one side. Other goldfish in pond don't have lumps. No other symptoms...fish seem to feel okay and acting normal. He lives in east Tennessee. In summer he cleans the pond regularly, and uses a filter. I can't find anything similar in searching goldfish problems. Does anyone have information or experience with this?

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  • Jeremy Roche - 2013-02-04
    Could be a bacterial infection.  Isolate these fish in a hospital tank.  Clean and treat other tsnk as well.
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lorraine - 2011-05-09
I have a lion head goldfish and it has growths on both front fins. Is this normal? Does anyone know what this could be? I would be greatfull for any help. He is about 9 years old and lives in my outside pond he. He is a good 10 in or more I dont know how long they live.

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  • Charlie Roche - 2011-05-09
    I tell you one thing, your goldfish is about as big as they get. Not too many grow to 10 inches so he must have had really great care. Now for the white spots. Sounds like ich which is treatable. Click on Fish Diseases and Treatment and scroll down to symptoms. Ich is there at the top and white spots on fins is a symptom. There is also the recommended treatment listed. Now if the spots are cloudy or webby looking it might be a fungal infection but again it is treatable. Goldfish normally live 10 - 15 years but 20 years isn't unusual but there is a record breaker who is now 43 years old. Take a good look at the description of symptoms and I believe you will have your answer. Good luck and let us know.
  • Clarice Brough - 2011-05-09
    What kind of growths? If they look like grey or white cottony patches, it could be a fungal infection. Not sure what other types of growth they could be.
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Scott Johnson - 2013-01-15
After adding a few neon tetras to my 55 gallon tank all the fish in it appeared to be completely covered in tiny air bubbles. this occured after having them about 2 weeks. There are only 9 other fish in the tank the largest being 2 3inch silver dollars. Within 3 days all fish had died. Any ideas?

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  • Clarice Brough - 2013-01-15
    What looks like tiny bubbles on fish could be several things. Tiny bubbles can be too caused by too much aeration in the tank. Micro-fine oxygen bubbles in the water can make the water look milky. The bubbles can attach themselves to the gills, fins and scales, and they fish can develop bubbles under the skin. But it could also be a parasite like Ich, which is very common if fish become stressed. If your other fish are fine, and are not getting any bubbles on them, I would suspect Ich.
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Lucy - 2012-11-26
I have goldfish with white lumps on its head. their is also a human looking white head type thing too. No loss of appetite and nothing has been changed apart from the water. Im really worried it will spread to the other goldfish

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  • Jeremy Roche - 2012-11-26
    First thing to do is test your water parameters.  More than likely it is a  fungus.  There are many fungus medications on the market. Check here for symptoms and links to the medications.
  • Clarice Brough - 2012-11-26

    Hard to say for sure what those bumps are, lots of possibilities. For example if they have a cottony look to them, then it is most likely fungus. Or they could be damage from an injury from sharp objects, a collision, or possibly from tankmates, which has perhaps has become infected. Or it could merely be the fish equivalent of warts, or possibly a tumor of some kind.


    The most important things are that the fish has a large enough tank and really good water quality, i.e. no ammonia, nitrite, and nitrate or less than 20. You are right to worry about your other fish too, but keep in mind that infection does not often run rampant in a tank which has excellent water quality. Keep an eye on them for sure, and you may want to do more research on goldfish diseases if you see any changes. Good luck!


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mike - 2013-01-13
I have a 100 gallon tank with gravel water filters and a canister filter rated for a 200 gallon tank. Recently, I added my quarantined fish that I bought from a very good fish store who quarantined their fish for a month. So these fish have had 2 month quarantine time. Anyways, my fish started to get what looked like fin rot and white spots on their fins. I treated it with malachite green and formalin and removed my carbon filters also. The fish seemed to respond very well to this treatment. Now, they seem to have cloudy cornea's. I just completely cleaned the tank as of yesterday. My question is, should I continue to use the malachite green and formulin or should I switch to a Triple sulfa or Tetracycline type treatment? Thanks for any input on this matter.

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  • Jeremy Roche - 2013-01-14
    What type of fish is it?  How many other fish in the tank?   Many times this this happens from a pH issue.  Could also be a diet issue.  Maybe the fish is not processing or getting the needed vitamins.  I would give them a break on the medications for a bit.
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Evan - 2013-01-10
My dojo loach recently got sick, he has a bent back but not at a strange angle,just consistently bent. Does anyone have ideas because that is the only symptom he is showing. Please reply i do not have much time.

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  • Clarice Brough - 2013-01-11
    Unless the fish was injured in some way, it could be that you are dealing with Fish Tuberculosis. Developing a bent back (spine) is the symptom of this and unfortunately it can't be cured.
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