Unspeakable things at the hatchery...ROTFL!
I just enlarged the pic, and look more closely. It has a lighter band, on the end of the tail fin. That "one ring" growth--as a fisheries biologist explained--indicates a one-year holdover brooder. That fish probably worked it's up into the creek, after being planted last year, when the summer temps warmed the lake too much. It obviously ate well, and had the proper temps and oxygen supply (in the creek). Then, he/she meandered back into the lake...only to find my friend's OFFering...and it's sudden demise!