I've caught a couple like that in the wild over many years of fishing. But I've always attributed those to being very old, possibly diseased, fish that were on their way out.

It is a sad sight.

.10 surface acre pond, 10.5 foot deep. SW LA. The epitome of a mutt pond. BG, LMB, GSF, RES, BH, Warmouth, Longear Sunfish, Gambusia,Mud Minnows, Crappie, and now shiners!!...I subscribe!!