A funny about sushi bars. They have two kinds of mackerel sushi:
Spanish Mackerel
Japanese Mackerel
The "Spanish Mackerel" is Norwegian Mackerel, if they can get it, Japanese Mackerel if they can't.
The "Japanese Mackerel" is a lightly pickled mackerel, something they learned from the Portuguese. It too will use Norwegian Mackerel if they can get it.