I put dog food in my dog proof then put fish oil on it but if you put crawfish oil on it it’s supposed to catch coons not possums. Never tried it though
Every trapper gets the opossums. Once ya thin them out you will get more coon. A tip is to set 2 or 3 sets at each location. That way if a opossum comes by first ya still got 1 or 2 more sets working for the coon that come by! The dog-proof traps will miss nearly all opossums. Try a couple of those!