Fig. 17. Change in the position of the regions of commercial whaling 

 during the course of the summer (according to pre-war data). 1, November; 

 2, January; 3, March (Mackintosh, 1973, modified). 



concept. A slightly different 

 of mul tiannual visual registra 

 Mackintosh, according to which 

 ring, moving southward in the 

 furthest northern position is 

 position--in March. It agrees 

 accumulations of whales (Fig. 

 in the northern latitudes is r 

 However, £. superba swarms in 

 existence of swarms is longer, 

 i.e., the presence of swarms i 

 plankton bloom (Pavlov, 1969, 

 maxima ring, as shown above, c 

 krill swarming. This indicate 

 primarily a reflection of the 

 can hardly be considered as an 



picture is yielded by the summarization 

 tions of surface swarms, undertaken by 



the "krill zone" is a narrow circumpolar 

 summer, following the retreating ice. Its 

 observed in December, its most southern 



well with the distribution of commercial 

 17); therefore, the disappearance of swarms 

 elated by this author to consumption, 

 the intervals between feeding and the 



the more abundant the phytoplankton; 

 s most typical of the period of phyto- 

 1974). The position of the phytoplankton 

 hanges with time analogously to the zone of 

 s that the picture drawn by Mackintosh is 

 character of distribution of E. superba and 



indication of the abundance of the species. 



95 



