This is a solid-looking koi ,however the Caudal Peduncle – The narrow part of a fish’s body that connects the main body to the caudal fin (tail fin) is notably thick, and is out of alignment with the rest of the body.
You can see this koi fish swimming in the video, and that it swims normally with overall balance and swimming posture not affected. This fish is healthy in all aspects. This koi fish has been reduced because of the deformity of the caudal peduncle.
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