Sealed effectively and frozen. Haven’t attempted it still. Does have a strong fish scent on the outside from the bag. It appears yummy. I think the type of packaging that they use was different. There was some blackish liquid which has a bad stench After i was opening the box. https://howtocookfrozencodroe03579.blogunok.com/32052223/helping-the-others-realize-the-advantages-of-frozen-norway-mackerel