During this period, the main attention of the Soviet scientists was directed to the migra- 

 tions of the mature Atlantic-Scandinavian herring which had contributed to the great fishery of the 

 USSR in the North EurojDean basin. During these years, a large amount of material was also 

 collected on the distribution of the immature herring. New spawning areas were disclosed by the 

 Soviet investigators of the Atlantic -Scandinavian races of herring on the edge of the continental 

 shelf of the North Sea and around the Faroes. 



In order to study the migrations of the Atlantic -Scandinavian herring, it was necessary to 

 organize extensive hydrographic investigations. Such investigations were carried out by the 

 Institute during the following years, adding essential corrections to the scheme of the currents 

 of the Norwegian Sea, presented at the beginning of this century by Nansen and Helland-Hansen. 



The investigations threw light upon the biology of the Atlantic -Scandinavian herring, the 

 areas and conditions of their reproduction, the drift of the larvae and young, the migrations of 

 the mature individuals, the structure of the spawning population, and the biological premises of 

 a rational fishery. These questions are treated in a paper by Yu. Yu. Marti in the present 

 volume . 



The feeding conditions of the Atlantic -Scandinavian herrings are described in the papers 

 by E. A. Pavshtiks, V. A. Rudakova, and V. D, Abramova. A study of the ripening of the gonads 

 is given by V. A. Naumov. 



The results of the Soviet investigations on the summer -spawning herring in the region of 

 Iceland and the Faroes are given by K. A, Liamin. The author submits well-founded data on the 

 existence of this race, stating its difference from the spring- spawning Atlantic -Scandinavian 

 herring, and demonstrates the scheme of its life cycle . 



Also published in the present collection of papers are the latest works of the Institute on 

 the biology of the herring of the White Sea by B. M. Tambovtsev and A. P. Vilson. 



