The Atlantic salmon, or Salmo Salar, is a magnificent athlete which swims much faster than a trout. A bright silver colour, its grey back can be  more or less blue in the sea. In the river it becomes copper-coloured. Its natural milieu is vast, extending over the whole North Atlantic, from the Hudson River to the Baltic Sea. The area where it fattens itself up is to be found to the west of Greenland, in the north Faeroe Islands and in the sea off Norway. Unlike its Pacific cousins, it spawns between 2 and 4 times in its life – so effecting as many migrations in the sea as in the fresh-water. It is also farmed, especially in Norway.