I am the patron saint of anything pathetic.
My first thought was
"send it to me"
Do you think it might have been some horrible injury? I was looking closely at the pic and there seems to be a minor injury to one of the fins and a little blood.
I sincerely HOPE that is the answer...the possibility of it being a defect brings the thought of pollution in the collecting area.
It does look like a deformity. I have seen batches of commons that are completely healthy, and then one will be deformed in some way. In nature these wouldn't make it to be more than a couple months old at best.