In our marine areas, there are several different stocks of herring, but Norwegian spring- spawning herring are definitely the largest. In addition, there are other herring stocks, e.g. near Iceland, in the North Sea and in the Skagerrak. Norwegian spring-spawning herring spend the winter in the Vestfjord area. In February/March, they begin migrating toward the grounds off the northerly part of the West Norwegian coast (Nordvestlandet), where most of the spawning occurs. The growing grounds for young herring are located in the Barents Sea.