Thread: Poorly Koi

I noticed skin discolouration about a month ago. Now I can see what looks like a green moss where this discolouration is, I had a koi previously that had a bad scrape against a rock who had the same and it fell off and healed. The other day I noticed on the 7 year old that he also has other problems, not sure if a fungus or just wounds that are healing. Also I had a gold fish that passed- I thought it was egg bound at first but then noticed red patches and slightly raised scales - so perhaps dropsy, I treated the pond with Blagdon anti ulcer and the treatment completes tomorrow even though the treatment was for the goldfiah that passed.My concern is with the koi...., if I upload pictures will you be able to say if wounds or something else and how I can help him, hes not really been eating and tends to stay in one part of the pond apart from a swim around now and again, where he seems ok and eats the odd fly.Please advise what I can do or what it may be.

Originally Posted by Carla

I noticed skin discolouration about a month ago. Now I can see what looks like a green moss where this discolouration is, I had a koi previously that had a bad scrape against a rock who had the same and it fell off and healed. The other day I noticed on the 7 year old that he also has other problems, not sure if a fungus or just wounds that are healing. Also I had a gold fish that passed- I thought it was egg bound at first but then noticed red patches and slightly raised scales - so perhaps dropsy, I treated the pond with Blagdon anti ulcer and the treatment completes tomorrow even though the treatment was for the goldfiah that passed.My concern is with the koi...., if I upload pictures will you be able to say if wounds or something else and how I can help him, hes not really been eating and tends to stay in one part of the pond apart from a swim around now and again, where he seems ok and eats the odd fly.Please advise what I can do or what it may be.

Are your water tests good


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Yes, have been testing daily

Originally Posted by Carla

Yes, have been testing daily

Have you srapped

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Srapped?- sorry I dont understand

Originally Posted by Carla

Srapped?- sorry I dont understand

Microscope for parasites

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Gosh, how do I do that, scrape the green off and put under a microscope?

part of it is hanging off, did you see the under bit and towards the back where theres an indent?

someone else said SAP- totally lost of what to do

As an additional thought i have some questIons re water changes and the quality of the tap water which may be useful

I have high levels of iron and zinc in my tap water and unless I use colombo or aqua extreme dechlorinator (only dechlorinators which remove metals) my fish quickly suffer from ulcers, bacterial infections etc …….

1) how often do you do water changes
2) if yes to q1 how many gallons / litres do you change per week and what percentage of pond volume
3) do you use dechlorinator and or purification cartridges for water changes
4) do you dose at recommended rate of manufacturer (for dechlor) or when were your cartridges last changed
5) when did you last obtain / study a water report for your water supply area (from your water company)

In summary infections are typically are caused by
1) inadequate filtration leading to poor water params
2) heavy metals and / or chlorine/ chloramine in tap water which is not removed
3) low oxygen levels in water
4) extreme daily changes in water temperature combined with any of the above - if i didn't heat mine the pond water would swing 6° a day in the summer (3° up and 3° down)