Biology and population dynamics of the Norwegian spring- spawning herring

The name "Atlanto-Scandian herring" was introi duced by Johansen (1919) to describe most of the herring found along the Norwegian coast, in the Norwegian Sea, off Iceland, off the Faroes, and on the northeastern edge of the North Sea.Today the term is frequently used as a common name for three stocks : Norwegian spring spawners, Icelandic spring spawners, and Icelandic summer spawners (Fig. 1).The Norwegian spring spawners are the largest of these stocks, with spawning grounds situated mainly along the Nonvegian coast.The Icelandic spring and summer spawners have their spawning grounds at various localities off the Icelandic south and southwest coast.I t is known from studies of biolopical characters "