Need input on sick fish

Mike56(7a)April 10, 2013

All 20 of my Koi and other fish came through winter well but today I see a lump on my 8 year old orange Koi. I look over my fish all the time but never saw this till now. Its about the size of a quarter and 1/8 high about 2 inches forward of the base of the tail on her one side. Her scales are raised over the bump. I see no other issues or discoloration any ware on her and her behavior is quite normal.
Has anyone seen this before or have an idea what it maybe? Tumor or maybe a parasite. I don't know if I should treat her or cull before it moves to the other fish.
Any input will be appreciated.


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They do get tumors Ive heard of it,never seen one.

    Bookmark   April 16, 2013 at 5:28PM
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Hi Mike. Is this lump a whitish gray colour? Sometimes during the winter months, the Koi will get these little greyish white patches and it's normally called carp pox. Not to worry, it's just due to the lack of Vitamin D in your fish due to not enough sunight. In time it can disappear but sometimes it stays.
If you are still concerned, you could remove your Koi from the pond, pat the area dry and add polysporen to the sore and it should start to heal. If it doesn't it could be that water conditions are off. Check your bio-filter to see if it's dirty and make a one third water change from the bottom of the pond.

Your's Koily, Lorraine

    Bookmark   April 27, 2013 at 2:54PM
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I am happy to see your posts and participation on this forum. That's what makes it enjoyable.
Unfortunately I culled that fish from my pond to avoid any potential problems with my other fish. I don't have a sick tank because it is such a rare event. I learned years ago that doing a wait and see, or treating the hole pond for one bad fish is not wise. This one had a quarter size lump under the skin with scales standing up like dropsy in that location.
Till next chat,

    Bookmark   April 27, 2013 at 3:50PM
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Hi Mike, I agree with you about medicating the whole pond but sometimes it is necessary. If I were to notice a fish that had a sore on it, I would do what I suggested above. It is stressful on the fish you are trying to heal but not on the other fish in the pond.
The other thing is that this sick fish could be an indicator fish which means that if the immune system on this fish was lowered, (say, due to poor water conditons) it would then give you pause to think: when did I do my last water change, when was the last time I checked the bio-filter, is the filter large enough not so much for the size of the pond but the fish in it, if you have to clean your filter every month by hosing everything down, this means that your filter is not built properly or is only working as a mechanical filter which does nothing to get rid of the toxins in the water.
Also, I used to use test kits on my pond 25 years ago but I found that in some ponds the kits would say that the water was perfect but I would have fish sitting at the bottom of the pond or gasping at the top and in other ponds the kit would say that the water was bad but my fish were swimming around healthy and happy.
Now I let my fish tell me how they are feeling but I make sure that I make those monthly water changes from the bottom of the pond and because I have these great bio-filters, all I have to do is backwash and check to make sure that no sludge is getting behind the window screening to sludge up the scrubbies.


    Bookmark   April 28, 2013 at 2:18PM
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