Mackerel is one of the most famous representatives of the marine world for residents of Russia and all of Europe as a whole. The biggest advantage of mackerel is its Omega-3 content; in mackerel its content is several times higher than in other marine fish. Fish is one of the main products in the human diet. Fish contains a lot of vitamins, easily digestible protein, it is low in calories and contains many healthy fatty acids. And in combination with mushrooms we get a complete dish.