New rule: canned fish product should be fully preserved

OK, what does "semi-preserved" mean and, really, shouldn't a canned fish product be fullypreserved?

I think I know the answer because I got out a tin of anchovies for a Caesar salad. There were two tins, one was the old one of unknown vintage that I recently uncovered in my pantry cabinet (where did that come from?), and the other was a brand new tin.

I presume I opened the old tin, and it really looked more like cat food than anchovies. I ate a bit of one; should I fail to post in the future I may have died. Tell the CDC it was probably the anchovies.