Cod will eat pretty much anything no matter how its presented or cocktailed... firm favourites are black lug and squid mussel and lug and lug and crab, some days a single black is enough for them others, only the biggest smelliest of baits will do... experiment, have a play and make notes on catches etc =] also looking in a caught cods guts will soon tell you what is in the food stream at that time =]
Ross