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A sea is smaller than an ocean. Think of a sea as a kind of "sub ocean" or region. For example the Sargasso is a sea region of the Atlantic (Ocean), the Arabian Sea is in the Indian Ocean and the Bering Sea is in the Pacific.
In many countries the names they call fish or other products are a result of market testing. A type of fish that was called by some name in 1950 may now have a new name to try to encourage shoppers to try it. Calling a fish sea bass or whitefish may be easier for shoppers to try.
In reality the fish ought to be sold as exactly what fish they are. I'd suspect that a dna test of the fish in a local store would result in some very different than marked results.
but I don't think it has anything to do with "sea trout." I do think that that is a truly vernacular usage.
Mahi-mahi is one example of a marketing name for a fish. It used to be called "dolphin fish" (no relation to porpoises). If you read Kon-Tiki (and, if you haven't, you should), there are frequent references to eating "dolphin," by which they mean the fish, not the mammal.