I am guilty of this
I did know to wet my hands first, and I did know about the mucus coating, but I need to practice better methods of releasing the fish in SOME cases like when I want a pic and bring them on shore but it can be really tough because I'm by myself most of the time.
I due my best to tire them out before I bring them to shore to minimize flopping around, but I think I can eliminate this all together by buying a decent rubber net and a cradle for bigger fish.
Thanks for bringing this to our attention in a decent way.