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  1. #1
    Member Rank = Tosai Moza's Avatar
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    Any ideas or what these are?

    I've kept Koi for many years some are over 40 years old, all my fish are around 70cm's plus. They have been in the current pond about 6 years with no issues. However, I've recently lost two fish weighing about 7 to 8lbs and the others looked sullen and swimming low in the water. PH, Ammonia, Nitrite & Nitrate have not changed and all look ok. I do run on a drum and Bio filter, which has always done the job with no issues. These fish seemed to die after I cleaned out the filters, which because of leaves I've recently done more regularly, so I wonder if it could be Chlorine as I did not use a de chlorinator and with the increase in cleaning may have been an issue? Incase this is the issue I've since switched on a back up air pump to increase the air to vent off any Chlorine, and since then they seem to have picked up, so I suspect this may have been the issue?......

    That said I did a scape of the dead and other fish and found no parasites, but under the microscope, however, I did have these donut shaped disc's, they are not moving or spinning. I cannot find anything online about them and wondered if any one the forum could ID what they are. As I said they are not moving, so I suspect they are not a parasite?

    Apologises for the poor photo's which I took with my iPhone down the lens.

    Regards
    Pete M

    IMG_1155.jpgIMG_1157.jpgIMG_1159.jpgIMG_1156.jpg



  2. #2
    Moderator Rank = Supreme Champion Feline's Avatar
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    Those are air bubbles, so no worries with them.

    You need to add some dechlorinator liquid, because chloramines cannot be ‘gassed off’ and are long lasting in the water, often accumulating in peoples ponds who don’t dechlorinate top ups.

    Your deaths could be related to the chlorine/chloramines, but parasites taking advantage of the weakened state of fish unhappy about the chlorine are also a definite possibility. Do you have a decent resolution on your microscope to look for costia? It’s always the easiest one to miss being so tiny.

    How much mucus do your fish have on them?

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  4. #3
    Member Rank = Tosai Moza's Avatar
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    Hiya, thanks for the reply, and the answer, now you've said what the discs are that makes sense. I have x200 so a pretty good microscope but I'll have another look and see if i can ID anything else. I've just put the de chlorinator in and I suspect that may have been the issue.

    The mucus on the fish is not as much as I would expect (I fish for course fish and they tend to have a lot more).


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