Rusty Jones sells a bait called 'LUCKY'. It's ground, fresh Beaver meat, paste like.
You don't necessarily need Beaver Meat to catch a Fisher. I found them to be like a large, black Possum that will eat anything or work most lures.
You absolutely don't need beaver meat. The fishers I have caught have been in all varieties of sets, including some sets without any bait, just flat sets with lures. Here is a trail cam series of videos I had set up on a natural rock cubby. You can see the fishers coming back to pull out all varieties of bait I had in there. The order in which they took the carcasses out were...
Iíve eaten beaver steak and backstraps several times. Itís very mild ,tender and is good for grilling. I believe that beaver that get whacked with a 330 or drowned arenít as good as one you come across that is alive in the trap. The ones I had to shoot bled out and I think it made for better eating. Or it all just be my imagination, as we bleed out all our walleyes we catch.