Also if you have not fished the wind river before bring a backpack to carry your fish. Most places in the canyon are chore to hike in and out. I fillet my fish and throw the carcuss in the river. Yes it is legal to fillet your fish on the Wind River only when finished fishing. The game warden only needs to be able to tell how many fish you have.
The fish are biters so don't keep snagged fish. The WDFW watches from the top of the canyon and busted 5 people on Tuesday that I know of. These people were prowd enough of their tickets that they had their picture taken at the Wind River Market holding them up.