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Can anyone tell if it's fin is docked?
I remember someone in Alaska or something caught this huge ass salmon that was bigger than that pic, I think.
It grew to that size because it got hit by a boat, and it ripped off one of it's fins, and did some other damage (not sure, can't remember) but what this did was mess up it's mating instincts.
This caused the fish to not do anything but literally swim and eat. Which also meant no migrating, so it never really stopped growing.
Anyways, if it could happen to a salmon, then maybe it happened to this koi?