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· Premium Member
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I was just looking up WD, seems the tail of that fish is darker than normal and there seems to be some deformity of the back near the tail.

Whirling Disease is sometimes called "black tail" because of the color change to the tail. I also causes skeletal deformities and from what I can see I am not certain if that is a deformity or if it is an earlier injury. Did you happen to notice how it was swimming?

My answer its possible based on what I see.

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