Mackerel is one of the most health beneficial kinds of fish you can eat - it contains lots of omega-3 fatty acids of which we can never consume enough. Mackerel is a common name applied to a number of different species of fish. They occur in all tropical and temperate seas. The Atlantic Mackerel is by far the most common of the ten species of the family that are caught in British waters. Most live offshore in the oceanic environment but a few, like the Spanish mackerel (Scomberomorus maculatus), enter bays and can be caught near bridges and piers.
In contrast to salmon and trout, mackerel is a species that cannot be farmed, so all mackerel you buy was caught in the wild. They can reach the mature age of 20 years. Usually mackerel swim in large schools of several thousands. It is not known if the schools hold together all the time, but fishermen tend to think so. The members of a school are usually of the same size. In summer, they tend to move towards the shores and the surface of the water, while they would move into deep water in winter. Mackerel school by themselves, as a rule, but sometimes they are found mingled with herring, alewives or shad.