Serious minkers here use suckers(cut in 3rds),caught during the spring run and frozen til fall
Sucker is good bait, if a fella takes the time to get some. Muskrat is what I'll use though, but you have to go rat trapping first, lol.
If I was to concentrate on mink instead of rats, I would make sure I stocked up on sucker , bullheads, and save any tulibbees from winter ice fishing. Muskrat carcasses get freeze dried if you try to store them for a year .