Guess I'm lucky here in northern BC as don't see many others on the ice.
I might pull out my artificial eye and go over to the hole he is using. Tug on his shirt tail whilst saying "Daaa, Daaa, Daaa, fissssy, fissssy, fissssy, fissssshhhhhy, biiittttee." Maybe lift your leg like a dog and mark your territory.
Or if you really want to get rid of him: Go over to him and say "I really like your rod, do you like mine" Say this while winking and licking your upper lip. He will get grossed out and leave. If he says "Yes" and winks back then you had better leave.