Crappie tails

[Panfish16]

I been fishin for while and have caught alot fish. I never seen any other fish with this bend or hump in the the tail as what Ive seen in Crappie.Anyone esle seen this? Sometimes its a bend right before the tail or its a wide or thick area before the tail. Is this genetics or from predators? it also seems like its more in small lakes and pits. I know its tuff to get a electric knife through and most time lose the fillet. I was just wondering if anyone seen this! Good Luck

[Hillbilly910]

There is a diformity, i think its called lordiosis or something like that, where they have bend or arch in their tails. I have seen this on largemouth bass as well.

HB