Actually yes. I used to volunteer at a hatchery and every year a few of the off spring would have deformed tails or broken tails like the one you caught. I was told by one of the biologist that it could be from inbreeding. Sounded crazy to me at the time but actually made sense. This particular lake was only stocked once back in the 40's and after the 80's they started keeping the big girls and spawning them out at the hatchery. They've done this for years so there's really no new genes going back into the lake. Just my guess.
I have caught a few fish over the years with tail and spine deformities. I was told the same things that fish pick deformities up during the developing and hatch stage. Extremely poor water conditions,poor food sources,and contaminated water sources can also play a factor.