362 



DISCOVERY REPORTS 



rather more complete evidence for the Blue whale there follows another migration 

 northward and southward, at the end of which the whales are verging upon sexual 

 maturity and again migrate to the north for breeding, i.e. two age groups should be 

 present in southern waters, one of whales just weaned, the other of whales "verging on 

 maturity". Representatives of the first group should not appear at all in the catches for 

 mothers and calves are protected. Therefore all the immatures taken should belong to 



one age group only. 



S b Table IV 



Length and scar ages of female Fin whales immature by 

 examination or less than 20 metres 



12-90 

 16-70 

 13-90 



H- 6 5 



Number of scar ages 



17-10 

 19-60/) 



i9-75/> 

 1 6-45 

 19-65 

 19-10 



17-55 

 16-90 



i8-45 

 17-70 



18-30 

 18-00 

 19-30 

 19-80 

 14-10 

 17-75 



i8-35 



18-85 

 16-60 

 18-40 

 18-65 

 1 6-oo 



17-75 

 19-80 

 19-40 

 17-80 



i9-95/> 

 16-93 



16-15 

 18-50 

 16-70 

 19-05 

 17-95 

 I7-95 

 16-25 

 14-60 

 17-10 

 18-10 



19-90/) 



19-30 



18-90 



18-75/. 



19-70 



19-65/) 



19-30/. 



19-00 



19-50 



I9-55 



19-90/) 



19-80/) 



19-30 



19-23 



17-00 



19-85/. 



19-25 



18-20 



19-60 



16-50 



iS-55 

 18-25 

 19-50 

 19-87 

 19-85 

 18-25 

 18-20 

 19-00 



16-30 



I9-55* - 

 21-40 

 19-20 

 19-65 



18-16 



Note : /» = pregnant ; r = resting. 



