ALASKA FISHERY AND FUR-SEAL INDUSTRIES, 1935 



69 



Distribution of pups on the Pribilof Islands, Aug. 10, 1935, and comparisoii with 



distribution in 1934 



MORTALITY OF SEALS AT SEA 



In computing- the number of seals of the various age classes, the 

 same mortality rates were applied as for the season of 1 934. Although 

 mortality rates actually vary considerably from year to year, the 

 present rates appear to answer all essential requirements and therefore 

 should be used until abnormal conditions appear. 



COMPLETE COMPUTATION 



Following is a summary showing the number of the various classes 

 of animals in the Pribilof Islands fur-seal herd in 1935. The methods 

 used to compute the number of animals of each class are also shown. 

 The total number of seals of all classes is estimated to be 1,550,913. 

 This is an increase of 8.42 percent over the preceding year. 



Complete computation of fur seals, Pribilof Islands, as of Aug. 10, 1935 



Class 



Pups, estimated--- 



Breeding cows, 3 years old and over, by inference 



Harem bulls, counted-. 



Idle bulls, counted-- - - 



Yearlings, male and female, estimated: 



Females born in 1934 - - 



Natural mortality, 40 percent 



Yearling females, Aug. 10, 1935- 



St. Paul 

 Island 



397, 993 



397, 993 



9,444 



2,082 



184, 260 

 73, 704 



110,556 



St. George 

 Island 



89, 890 



89, 890 



2, 103 



453 



41,616 

 10, 646 



24, 970 



Total 



487, 883 



487, 883 



11,547 



2,535 



225, 876 

 90, 350 



