Figure 12. The distribution of the plankton biomass in the 0-50 meter layer in the Norwe- 

 gian and Greenland Seas (May 27-June 9, 1951). 1. up to 100 mg/jj^3; 2. 100- 

 200 mg/m3; 3. 200-500 mg/mS; 4. 500-800 mg/m3; 5. above 800 mg/mS . 



Favorable conditions for the feeding or fattening of herring developed in the Greenland Sea 

 (see Figure 13) in June-July of 1954, where at this time large quantities of Calanus hyperboreus and 

 young Themisto libellula had been produced . 



The plankton biomass near the cold waters of the East Greenland current often exceeded 

 2000 mg/jj,3. A3 early as June, schools of feeding herring entered these waters which had a temp- 

 erature below 3°. 



In July, the water temperature in the southeast regions of the Greenland Sea had risen to 

 5-6° and the herring that had arrived from the plankton-poor regions of the Norwegian Sea had a 



127 



