to 13.2%, Themisto abyssorum and Themisto compressa f^ 

 and young of the lantern fish Myctophum glaciale 20 .5%. 



bispinosa 23.8%. Euphausiacea 42 . 3% 



May June July 



f95l& 



1952s. . 



19532. 



/954 2. 



f955z. 



53,95 



18.05 !8,d0 



Figure 2. Average monthly food spectra of the Atlantic-Scandinavian herring for different 

 years. 1. Euphausiacea; 2. Young fish; 3. Calanus finmarchicus ; 4. Cal - 

 anus hyperboreus ; 5. Amphipoda (Themisto ); 

 retroversa; 8. Others; 



9. 



Oikopleura ; 

 Feeding and non- feeding herrings. 



7 . Limacina 



In 1954 (in sample 6, Figure 3), the food contained a substantial quantity--65.1%--of adult 

 Euphausiacea, 0.7% young Euphausiacea, 31% Calanus finmarchicus and 3.2% Oikopleura and 

 ITiemisto . 



In addition to the qualitative analysis of the food (Figure 3), we give, for all the years of 

 the investigations from the month of May onwards, the results of the quantity -weight analysis of the 

 herring food in the Norwegian and Greenland Seas for the same samples during the period 1951-54 

 (Figure 4, Table 6). 



During all the years of the investigations, with the exception of 1955, the development of a 

 summer complex of plankton was observed in May and June in the waters of the Norwegian current . 

 The principal herring food during these months was Calanus finmarchicus , which accounted for 50 

 to 90% of the constituents of the stomach contents of all the samples for the period 1951-54, and only 

 in one sample (9) was there a predominance of adult Euphausiacea (78 .7%), The remaining compo- 

 nents of the herring food were very small and consisted of forms of plankton which develop in the 

 Atlantic waters during this season. 



149 



