

Figure 7 . Feeding grounds of adult Atlantic-Scandinavian herring. 



In 1955, plankton production was inhibited by unfavorable hydrometeorologlcal conditions. 

 Red Calanus appeared only in July, and young herring fed at first on Oikopleura labradoriensis 

 and young Themisto abyssoirum, while herring of older age groups in the region of the polar front 

 lived on Calanus hyperboreus , young Themisto libellule , and Oikopleura . In most regions, the red 

 Calanus appeared in July and were found in herring guts up to September . The feeding of herring 

 was not intensive, but remained uniform throughout the whole summer (June-September), and all 

 the herring had some food in the guts . Due to the uniform character of feeding, the herring were 

 quite fat by September . 



It has been established that, from the viewpoint of the fishing industry, the most important 

 path of the return migration of herring schools to the spawning grounds passes across the western 

 zone of the Norwegian Sea (Figure 8). 



In 1950, a number of herring schools proceeded from Bank "600" to the south-west. How- 

 ever, the presence of a large school somewhat farther to the east enabled us to concentrate the 

 fleet in the region of 7° east longitude . 



From the latter region, the herring schools moved in August and September towards the 



south. 



In 1951, we followed the movement of very large concentrations of herring moving via the 

 western edge of the western branch of North Cape current. In 1952 and 1953, the fleet fished 



41 



