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15-07-2018, 11:02 AM #1
Very large blisters near Koi tail
All,
I have recently purchased a house with a quite large established pond and 4 koi. One of the Koi has a number of infections on its tail - they may be fungal, but I cannot really find any images of anything that looks like it (see image). The other 3 koi are fine. I feel very sorry for this fish - its eating fine, but obviously, it is impeding its swimming and it just looks awful. Can anyone advise what it may be and how I can treat it please?
fish.jpg
thanks in advance,
Ant
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15-07-2018, 07:16 PM #2
People would need to see a good picture first before hazarding a guess, the blister/ulcer could be caused by an unseen parasite, the blister/ulcer may not be the route cause of the problem, the fish may have damaged itself due to parasites or it could be a water quality issue, have you done a water quality test, that would be the first thing I would clear up.
Do you have a net and clean bucket that you can catch the fish and transfer it into the bucket to take a better picture
We really need to ascertain the problem or at least eliminate certain things before treating4600 Gallon Concrete Block and Fiberglass
2100 mm x 710 mm Infinity Window 32mm thick glass
2 x Aerated Bottom Drains and Skimmer
Filtreau HiFlow 30 Drum Filter
Bio Chamber - 140 litres K1
Bakki Shower - 30 KG Sakura Far Infrared Media
2 x 18,000 lh pumps
Heated from house boiler through a heat exchanger
Idealseal MS290
My Pond Build
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16-07-2018, 11:52 AM #3
Hi Roy,
thanks for getting back to me so quickly. I've had a couple of goes at catching the fish, but its a wide and deep pond, and so far its managed to evade me. I will follow your advice and do a water quality test and update this thread.
thanks again - I really appreciate your help,
Ant
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16-07-2018, 12:42 PM #4
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16-07-2018, 04:43 PM #5
I wouldn't claim to be an expert but I would say that looks like a tumor - if it is, there is not much you can do. If the fish is still eating and happy then you could just leave it otherwise you will need to euthanise the fish. A high dose of clove oil - which is used as a sedative at low doses is about the most humane way.
6000g in ground koi pond
+3000g lily/Anoxic pond attached
29 koi (40 to 65cm)
Bottom drain, Mid water & Skimmer to Drum
JBR boichamber->Blue eco 500 pump ->below surface return.
Blue Eco 240 -> Large MB -> Waterfall -> Planted Anoxic pond (25 baskets)
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17-07-2018, 09:47 AM #6
Hi Pip,
thanks for getting back to me. My feeling is also that it looks like a tumour. Recently it has started to get bigger, but the fish is eating fine and does not seem in distress, though the weight of the tumour impacts the way it swims. I think I will leave it - I am reluctant to euthanize the fish - and hope that it doesn't get significantly worse.
thanks for your advice - I really appreciate it.
Ant
The Daily pond temp thread
Pond still covered, currently 11.6C Been really mild this year as far as pond temps go. ...