THE AGE OF FEMALE BLUE WHALES 229 



tion of these deductions to an estimate of the constitution of the stock of Blue females in 

 the Antarctic, and of the effect of intensive whaling on the stock as a whole. 



150 



West 180 East 



loO 



Fig. 1. Antarctic whaling areas (after Hjort, Lie, and Ruud). 



For clarity and uniformity the system of zoning the Antarctic whaling grounds used 

 in the publications of the Norwegian Whaling Bureau has been adopted. A chart of the 

 whaling grounds with identification marks is shown in Fig. 1. The small Area I is 



