Sadly, I think you are right! That's a horrible injury!If indeed the skin is missing from an area that large, sadly, there may not be much hope of saving this fish. Without the skin, there is no means to secrete a slime coat to protect this area and unprotected this fish is open to every possible bacterial, viral infection and parasitic attack existing in the pond...and there are many. I have serious doubts that even in time that this fish could recover and generate scar tissue to replace the damaged/missing skin.
The most humane thing would be to euthanize this fish for its recovery outlook, even with treatment, is bleak.
Hope it does OK. Please keep us posted!He's doing a lot better this morning it seems. He is actively swimming around in isolation tank. Not lethargic nor motionless. I had found an almost empty bottle of fungal and bacterial fish antibiotic and put all of the few drops that were left in the bottle in his water late last night. The wound has turned white. Don't know if that's a good thing or bad thing. But it appears as if it is healing. Heading out to the pond and koi store now to get more of that antibiotic.
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