I fillet both ways. I use the around the ribs method when I am at home or have an ample amount or room to work with but in the field I use the other method because you don't need as much space. You can whack both sides off then discard the carcass and take the ribs off where the carcass was laying. Good for a tailgait with a piece of plywood or something like that.
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Born to fish...Forced to work.