“• Fish must be packaged or transported in such a way that they can be readily unwrapped, separated, identified, and counted. •
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Muskellunge, sturgeon, catfish, salmon, splake, brook trout, brown trout, and rainbow trout, which have statewide length limits, must be transported with head and tail intact so the fish can be measured. Northern pike and walleye may be dressed or filleted except when on experimental, special, border waters, or other waters that differ from statewide length limits.”
This is from the regulations book that is available online or at most bait shops. The way I read it the only thing you may do is remove the guts. Slot for walleyes is 19 1/2 in. to 28 in.
