I'm with Whitty on this. I don't store anything, for people or fish, in opened tins. Even with bait, even though I don't eat it, I do handle it, and if it strikes me as slightly disgusting, out it goes. I know the fish may eat all kinds of stuff in stages of breakdown, but I'm not a fish, and, as we've seen with Covid, it's hard not to transfer what's on your hands to your face. I don't mean I'm squeamish - users of natural baits have got over that decades ago; I mean, I trust my sense of disgust. They reckon we developed our sense of disgust - the "disgusted" face is one of the universal facial expressions - as an aid to survival, as the stuff that disgusts us - shit, rotten or decomposing stuff etc - carries disease, and that instinctive reaction - yeuch, get it away from me - is a protection.