Animal Stories - Fish Disease and Treatment


Animal-World Information about: Fish Disease and Treatment

Introduction to aquarium fish diseases and treatments.
Latest Animal Stories
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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melissa - 2013-01-08
i have a very sick dojo loach. he has a very swollen body & i have been treating it with all the med i can get at the store. ive seen lil white worms but the meds will kill them i clean out the tank & my loach gets a lil better but i cant seem to get rid of whatever it is. please help, the loach is 6 yrs old. i feel soo bad for him. any suggestions?

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  • Jeremy Roche - 2013-01-08
    Have you checked all your water levels?  Could your loach be constipated? Could be chasing the wrong issue.  There are Planaria, tiny non-parasitic worms, live in the substrate in most well established tanks. Sometimes they can be seen crawling on the glass too.

    They are an essential part of the food web and biological diversity in an ecosystem or an established aquarium.
  • Anonymous - 2013-01-09
    thank you for respondind j. ya he seemsvery sick it looks like underneath his bulging stomach its grey like hes full of something? i dont know he is definately not swimming or acting like he is ok? are those lil white worms able to make the fish sick? the non parasityic ones u described? any other ideas?
  • Jeremy Roche - 2013-01-09
    Have you tried feeding it peas to see if it is a constipation issue? Maybe add some Epsom Salt.  Tetras are known to control the worms.  The worms should be harmless if that is what they are.  I'd try treating constipation.  Loach do tend to get over wieght and over eat as they age.
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Suryashis - 2013-01-08
I bought a couple of fantails a week back and it was on the first day itself after bringing the fishes that I noticed one small whitish scar on the tail of one of them. At first I did not pay much heed but over the next few days I saw the number of such spots have gone up in its tail and the previous one has slightly increased in size. No such scars have appeared on its body and the fish is playful as before. I don't think it's ick. Have tried to cure it using salt (NaCl), methylene blue, malachite green but to no avail. Please suggest a remedy.

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Sylvia - 2013-01-06
Hello Sir, I Have 2 Fantail Goldfish. But Since 2 days my one goldfish lips have turned red as if it have put a lipstick on the lips and her eyes r also snowy types and have little redness arouund it. the other one's stomach is bulky like and now it goes at the bottom to breath. it has also reddish colour on one eye. Sir, pls can u help me in curing them.

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  • Jeremy Roche - 2013-01-06
    Sounds like a bacterial infection.  Should be treatable with medication.
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