yea bluntforce/road rash of some sorts..... out of the fiddymillyun lips ive seen stretched spinnin/icefishin as a young kid and flyfishin ... i have never seen a line wrap do this to any fish....... seen a few gashes similar on my own body at times fallin off the old bmx..... seen it in salmon too when they leap falls and do faceplants into the rocks...... maybe the carslandweir/fishladder? would be full of fish leapin and has some rough hard edges........