Animal Stories - Fish Disease and Treatment


Animal-World Information about: Fish Disease and Treatment

Introduction to aquarium fish diseases and treatments.
Latest Animal Stories
Dave - 2012-07-02
Ever since I got my aquarium, fish have been dying at the rate of 1 every two weeks. And in the past 48 hours 5 of them have died. I'm not overstocked, filter works fine, water changes every week. The fish look discolored sluggish, not eating, don't swim much. No outward signs of a disease any ideas??? Hope you can help.

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  • Jeremy Roche - 2012-07-03
    Ammonia spikes will discolor.  check levels.
  • Mike - 2012-07-28
    Probably the H2O such as PH, tempature, alkalinity, softness/hardness, and nitrite. Has your tank cycled correctly?
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Devin Quinones - 2012-07-26
About a month or 2 ago I noticed a little bubble on one of my mollies. It was a light red and was small on its neck. I asked around and couldn't find out what it is. It got smaller and bigger on a dally basis and after a few weeks it started getting bigger and smaller on a larger Scale. It then spread and had smaller ones on its mouth and a clear bubble that covered much of its gill. So out of curiosity I touched the bubble and it seamed to open up. After a few days it looked like it got better. So I touched the other ones and it looks to me like its part of the skin because it's the color of the skin. Please help I don't know what it is and it's worrying me. The tank is a 5 gal and there's 2 mollies in it /the other is not infected/ I clean it and change the filter once a month. I have been using API fungus cure/ no noticeable affect

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lisa - 2012-07-24
I have a strawberry tetra. I've had it for probably 4yrs. Over the last 2 months it has formed some type of abnormality. It looks almost as if it's intestines are protruding or maybe some type of clearish, bubbleish protrusion. Is this what is called lymphocytis? No other fish are showing any signs of anything and the fish in question, other than the growth appears to be fine. Could this be something dangerous or contagious?

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  • Jeremy Roche - 2012-07-25
    Could be a parasite infection or thread worms.  I would quaranteen it.
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Don Gladstone - 2012-07-24
One of my pond fish has a grey/green growth on both sides of the body -  can I cure this?

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BlackHawk - 2012-06-18
I started a brand new aquaponics system with 2 - 60sf rafts and 1 - 175gal bin tank, washed well. I started with well water which I chlorinated and then circulated for three or four days. I then added eight 6-8' goldfish confined to the bin, about three weeks ago. Slowly, one by one, my fish are dying, my sixth died today. I found a small dark worm, maybe one or two ml long visible under the skin near the mouth. When I examined the fish internals, the ovaries were creamy white but the right ovary had a dark roundish spot about 4-5 ml in dia on the underside. It almost looked like a decay or open sore. Gills were bright red and all other internals looked fine. What killed this fish? The little dark worm-like thing is the first one I have noticed. All the other fish that croaked looked healthy, just dead. I did not open them up though. My water has no measurable ammonia, pH about 7.5, hardness is very high, and two bubblers in the bin. Please help.

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  • Jeremy Roche - 2012-06-19
    Could be a parasite or anchor worm.

  • BlackHawk - 2012-06-20
    JR - I'm no expert either but I suspect it was an anchorworm on the lip. I'm just surprised that there is not more sign of worm infestation. Six good-sized fish killed already and one worm so far. Maybe I'm missing, something, not seeing, in the tank or on the fish... Thanks for answering me.
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anna - 2012-07-16
My black widow tetras top lip is being eaten away and I'm not sure what ever it is is contagous or not to the other fish in the tank there is no loss of appetite but it is breating quickly

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  • Jeremy Roche - 2012-07-16
    Any discoloration or spots?  Water levels fin?
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Carol - 2012-07-13
I bought three balloon mollies and added them to my fish tank with the other fish. Within four hours the mollies have white stuff all over their bodies? It does not look like the ick to me. Not sure what to do? :(

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  • Jeremy Roche - 2012-07-14
    Velvet maybe?
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anne - 2012-07-10
My fish has skin problems but whatever that I used to treat it didn't work. Two days ago I found a white node on its lower back. This morning it left an opened wound. Can I submit a picture tonight before a quicker and more accurate diagnosis ? Where do I submit to if I can? Thanks.

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Adjei Francis - 2012-06-27
My African tilapia, oreochromis niloticus fingerlings have white patches on tail and broodstock have white pop eyes.What is happening to them and their treatments?

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  • Charlie Roche - 2012-06-28
    Sounds like a fungus or ich.  If you scroll up in this Animal World article you can determine (via symptoms) what you fish has and then provide the recommended treatment. 
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Daniel David James Elliott - 2012-06-22
Me and my mum and dad had gone out for the evening and when I arrived home I checked my fish tank to find my red tail black shark at the bottom of the tank basically bent so his nose was touching his fin and he was covered in white patches. also he has internal bleeding next to his front lower fins just really worried that my other fish may catch what ever he had. He has been acting odd for the last two weeks loss of appetite and hiding away in a rock by himself really need some advice because I'm worried that I might loose the lot again which I don't want to happen again after my heater stuck on and raised the temperature to 42 degrees killling all my fish please help urgently!

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