oh and the best bait for me was half an ear of corn with some Carman Hudson Seal No. 1 lure....I did try apples, carrots...oh and I forgot bait once and used mint chewing gum that I was chewing on...it actually worked on 1 rat.
I think the eye appeal of something different floating around is what draws them in. After 2-3 days the catch rate drops dramatically.