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It will work on any size fish, the only restriction you might have is the thickness of the ice. If ice is a foot and half thick, it will be hard to juggle your rod and the grip while trying to get to the fish. Also consider freeze up on the unit if it gets wet at all.
what does the thickness of the ice have to do with how the gripper works
sorry if i was unclear, i immagine that it would be tough to get ahold of the fish through any thickness. i do get the fish into the hole first, but once they have their head sort of in i prefer having a firm grip as soon as i can instead of just the hook and line. i have had enough fish get away or cause problems once they are started up, so i go with this now. boy i'm just wondering how hard it would be to grab a fish that's still under the ice, chasing it around and all under there .