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Spanish, in my opinion, definitely freeze better vacuum sealed. I've found that they seem to fall apart a little more after thawing when I freeze them in water. I've never frozen them in salted water though. The rest of the fish you've listed have firmer meat so it shouldn't matter as much.
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The culprit in frozen flesh breakdown is ice crystals in the fish-flesh. I lightly salt fillets and vacuum-seal them. I never have any go bad, but then -- I eat a lot of fish!
Another culprit is time. If you really like fish (like I do) you'll look forward to preparing them. I'm not sure that it matters just a whole heck of a lot if frozen fillets are in the freezer for two weeks or two months.
Whatever the species is, they're best fresh. I'll freeze some, as previously stated, but I'll fry-up or grill some right away. Weird, I know, but I really enjoy fish for breakfast! There's nothing better than FRESH grilled pompano for brunch!
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I agree on fish for breakfast. Take away the bacon, bring on a piece of nicely fried fish and scrambled eggs, toast.
I have a vacuum machine, love it, problem is no fish, usually get eaten before they get that far.