@Tetsujin Just a point of interest here. We JUST had a case locally. He home-canned salmon (improperly), it smelled and tasted bad, and he ate it anyway. He barely survived. Shades of Darwin
@Jolenealaska That may be another factor. Home canning is very much a US thing. No-one else really does it. It's quite hard to even find the equipment in the UK, you have to import it usually.