The first time my buddy caught a walleye he walked right up and lipped it, like most people do with bass...Lmao it was pretty funny. I've also been bit by pike, their teeth can really do some damage!
jags do not have anywhere near the teeth of walley, pike, dovii. i think i could i coulld feed my 14 inch jag with no problem if he would take it from my fingers but he would run away as soon as i put my hand in the tank.
IMO you can train any fish to eat out of your hand.
I handfed my carp and green sunfish, and nowadays handfeed my Oscar and Florida Gar.
And yes, they do draw blood from time to time, but I still love the handfeeding.
here's how i trained my O , with my finger dipped in bloodworms.
i dont have a jag, but i have a motaguense x loiselle hybrid, so its related, and he eats out of my hand no problem lol. hes got some teeth on him now so ive stopped but i think ill do it once i get some krill or sumthin