Last fall Blackfishing with a buddy . I land this Tog that looked as though it had been fileted and thrown back and survived. From behind the gills to the tail it was no fatter than it's backbone .
Got a bass off newcomb hollow one time. It had an orange worm float and a full leader still attached to the inside of its mouth, but still took my eel. Fish was around 45" and couldn't have weighed more than 20#.
Over the years I have caught a lot of bass with what looks like net marks cut into thier bodies. You could see the diamond pattern. Always thought they were by-ctach that made it out alive from the net.
I caught a pickerel ( the bluefish of freshwater with an eels slime coat) that had a lure in its mouth and about 3 feet of line wrapped around its mangled body. Cut it all free and let it go......like you said though about weather it lives or not....