Green backs are Mackerel, Spanish Macks are actually Jacks not a Mackerel. They do look very similar but if you look closely at the meat when bled out the spanish macks have lighter colored flesh and less oilly. If you try spanish mac sushi and mackerel side by side they taste very different, So that being said I'm sure some fish YT,WSB,Butts, and so on prefer different taste.
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