The tin can was invented in 1810. The can opener was invented in 1858.
I learned this while reading a bit about the last U.S. sardine plant, which closed down today. I love sardines, which always remind me of my dad. He sometimes used to eat them for lunch on Saturdays while the rest of us ate -- I dunno, something else. I thought it was fun rolling back the tin's metal lid with the little key that came attached to it. (They have pop tops now and it's just not the same.) Dad preferred the little tiny sardines with the tails still attached, and he'd usually let me eat one or two; I loved how extremely fishy they smelled, how delicious that olive oil they came packed in tasted. Dad would eat sardines on Saltines, which to this day is the only way I think Saltines are palatable. He often used to enjoy a bottle of Dos Equis with his sardines.
Sardines aren't a species of fish -- they are any of a number of small varieties of herring. They are always "wild caught" because there are no sardine farms in operation. Sardines are high in omega 3 and low in mercury. You can buy them packed in gross stuff like mustard, tomato sauce, and pesto, but I think they're best when packed in good old olive oil. Sardines were the first kind of fish ever to be canned and were popular until the 1950s, when canned tuna began to dominate the canned fish market.