Fresh frozen fish is fresher than fresh fish. Fish contain natural bacteria that are active at temperatures above 0 degrees.
With fresh frozen fish they’ve got no chance of getting active. The fish is processed straight from the water and frozen in. Bacteria get no chance and the fish remains as fresh as on the moment they came from the water.
You can keep fresh frozen fish for a long time and don’t have to be thrown away. You can eat fresh frozen fish all year round. Therefore there’s no waste. Fresh frozen fish is fresh fish that is frozen in immediately. Fresh frozen fish remains therefore fresh and does not contain any preservatives.