Norwegian spring-spawning herring, Atlanto-Scandian herring
The NE Atlantic Spring spawner herring (also known as Norwegian Spring spawning herring) is the largest herring stock in the world, and is widely distributed and highly migratory through the parts of the NE Atlantic where it occurs.
It is treated and assessed as a single stock, based on the evidence of no genetic differences between the various spawning areas. Occasionally, some mixing with other herring stocks may occur in adjacent areas to its distribution (ICES, 2014a).
Image: "Whitehead, 1985 FAO Species Catalogue. Vol. 7. Clupeoid fishes of the world (suborder Clupeoidei). An annotated and illustrated catalogue of the herrings, sardines, pilchards, sprats, shads, anchovies and wolf-herrings" via FishBase