Looks pretty torn up! That looks like more damage than just fanning a nest is gonna do. Waddya think might've happened to this puppy? Think them big monster (planted) trout have been nipping her in the tail??? Or, maybe the sturgeon, or big cats they have out there? They don't have stripers there, do they (at least not in sustaining numbers; maybe illegally slipped in)?

Can't imagine what else might cause such a clipping.