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  1. #21
    Senior Member Rank = Kyusai Koiz's Avatar
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    Yes, I do think you should give them all a good once over. If they are not too big and heavy, best way to do that with least amount of stress to the fish or the need to handle or sedate them, is to get them, one by one, into the pan net and from there bag them into a large clear polythene bag (like the ones you would have bought them home in). That way you can observe the fish all the way around and underneath, so you get a good look at their tummies and mouths. If you don't have such a bag and your remaining fish are a similar size to your Asagi, you could clean out your aquarium thoroughly, fill it with pond water and pop each one in there to observe it. The key is getting a good look with least amount of stress to the fish, but given what has happened to this one, I do think you should check them all. Try to get photos of anything you don't like the look of so you can share it on the forum.

    One of the reasons so many of us opt for windows in our ponds now is because they make checking fish for any signs of damage or poor health so very easy, especially during winter if the pond is covered over. It's the garden version of the indoor aquarium

    Another way to add the window experience to an existing pond is to do something like this:



    https://youtu.be/WX8sSFahm-A
    Last edited by Koiz; 30-10-2020 at 06:27 PM.
    11,440L Raised Pond, BD, Oase ProfiClear, Bitron 55W, 2x10k Aquaforte Varios, Skimmer to Waterblade

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  3. #22
    Senior Member Rank = Grand Champion samp09's Avatar
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    I would investigate your water thoroughly and check all parameters etc. I had pretty much exactly what you've had happen with my pond all spring, the fish would randomly get a ulcer on the mouth or fin rot, then it wouldn't respond to any treatments and gradually go downhill or sometimes within a day or two dropsy would set in and it would die/be euthanised. This was with all but one of my tosai that I brought and I only have one survivor which seems fine now, although at a time didn't really eat much for a while and was usually ravenous. I moved the fish to a pool and double dosed my pond with PP once they was out the water so it stayed purple for about 15 hours then left it a day or so longer before pumping it all out and drying the pond entirely. I then mixed up a bucket of water with a double dose of Virkon tablets and sponged all the walls down then hosed it all down again thoroughly and emptied the pond again entirely before eventually re filling again. My tap water has ammonia in so I had the pond run a couple of days to with filter bugs to try and get the bacteria going again and once adding the fish again I haven't had any problems. In fact, when I re added the fish my Goshiki must have jumped or flicked hard on the bottom drain as it had a fresh bump and raised scales on the side within a day but by 2 weeks it was entirely healed with nothing but a little antibac sprayed under the affected scales once. This said to me I had eliminated the issue as before not one fish that had any sort of bump or ulcer would recover or heal in the slightest. may seem extreme but its the only thing that worked for me

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  5. #23
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    I did exactly the same. After costia and flukes. Took all the fish out. Ran pp all night no fish in pond.
    Dumped it. Cleaned pond. Refilled pond.
    And then added the fish back in.
    Had NPS for 6 weeks. Then filters caught up.
    All good now. Also add virkon now. Every now and again.
    It has not hurt the water parameters at all.
    And all the fish are good now.
    Fred

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  7. #24
    Senior Member Rank = Grand Champion samp09's Avatar
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    Same as Fred, I usually dump the waste from the filter and purge the bottom drain when changing water, then add 3 virkon tablets to the waste area of the filter where the crap settles to hopefully stop anything having a chance to grow and all my parameters have been spot on since

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  9. #25
    Had all four fish out this weekend for a close look. The three smaller ones were fine. The chag has always had a dark spot on his bottom lip since I bought him about 6 weeks ago but didn’t think anything of it. Having had him out it looks like it might be a scar form an old ulcer? Is it something I should be concerned about? Could there be a connection with the mouth ulcer that killed the asagi? All four fish are very active and feeding well, especially now the temperature is a stable 16c.


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  10. #26
    Moderator Rank = Supreme Champion Feline's Avatar
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    Hmmm, a bit concerning really given what happened before. I would topically treat that now to try to get ahead of the curve with it- it might be a lot more superficial than the previous ulcer. But definitely scrape all of them again in case you are missing something- particularly costia is very easily missed. It is so rare for bacterial issues to be the primary problem that you need to keep looking and looking for something else.

    Also just to check- is there absolutely anything rough that these fish could initially have damaged their mouths on? I’ve seen things like this from hose clips or even plastic cable tie ends. Koi are remarkably good at causing themselves mortal injury in the most stupid way. I’m sure you checked before, but worth a thought.

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