@hawkeye10,
Well, we don't get Pacific sradines here but only the European or the Spanish sardine.
And those are mostly canned.
The trout - coming back to the original question - is a fresh water fish here, brown trout as original fish, rainbow trout introduced in 19th century.
Trout ponds are common here since the medieval ages - we have about eight here within a circle of 10 miles, three can be used by anyone.
And that is - in my opinion - the main reason that trout isn't canned: literally everyone knows someone, who smokes trouts (or you get them from the pond owners).