ALASKA FISHERY AND FUR-SEAL INDUSTRIES, 1931 95 



Complete computation of fur seals, Pribilof Islands, as of August 10, 1931 — Cont'd 



Class 



St. Paul 

 Island 



St. George 

 Island 



Total 



3-year-old males, estimated: 



2-year-old males, Aug. 10, 1930.., 

 Natural mortality, 12.5 per cent- 



3-year-old males beginning 1931.. 

 3-year-old males killed in 1931... 



3-year-old males, Aug. 10, 1931. 



4 -year-old males, estimated: 



3-year-old males, Aug. 10, 1930.. 

 Natural mortality, 10 per cent.. 



4-year-old males beginning 1931. 

 4-year-old males killed in 1931... 



4-year-old males, Aug. 10, 1931. 



5-year-old males, estimated: 



4-year-old males, Aug. 10, 1930.. 

 Natural mortality, 10 per cent.. 



5-year-old males beginning 1931. 

 5-year-old males killed in 1931... 



5-year-old males, Aug. 10, 1931. 



6-year-old males, estimated: 



5-year-old males, Aug. 10, 1930. 

 Natural mortality, 20 per cent. 



6-year-old males beginning 1931. 

 6-year-old males killed in 1931.. 



6-year-old males, Aug. 10, 1931. 



Surplus bulls, 7 years old and over, estimated: 



6-year-old males, Aug. 10, 1930 



Natural mortality, 20 per cent 



7-year-old males beginning 1931. 

 7-year-old males killed in 1931 . . 



7-year-old males, Aug. 10, 1931. 



Surplus bulls, Aug. 10, 1930 



Natural mortality, 30 per cent. 



Eemaining surplus for 1931. . 



Breeding bulls of 1930 



Natural mortality, 30 per cent. 



1930 bulls remaining in 1931.. 



Breeding bulls of 1931 



1930 bulls remaining, deducted. 



Increment of new bulls in 1931. 



7-year-old males computed for 1931. 

 Surplus bulls computed for 1931 



Total theoretical bull stock, 1931 



New increment of breeding bulls deducted. 



Surplus bulls, Aug. 10, 1931 



56, 745 

 7,093 



49, 652 

 38, 559 



11, 093 



12, 440 

 1,244 



11, 196 

 284 



10, 912 



8,805 



7,925 

 1 



7,924 



W 



(') 



8,378 

 2,513 



5,865 



9,076 

 5,865 



3,211 



12, 929 

 1,616 



11,313 

 9,208 



2,105 



2,431 

 243 



2,188 

 134 



2,054 



2,522 

 252 



2,270 

 1 



2,269 



(') 



(') 



1,833 

 550 



1,283 



2,045 

 1,283 



69, 674 

 8,709 



60, 965 

 47, 767 



13, 198 



14, 871 

 1,487 



13, 384 

 418 



12, 966 



11,327 

 1,132 



10, 195 

 2 



10, 193 



8,191 

 1,638 



6,553 



6,553 



5,612 

 1,122 



4,490 



4,490 



3,963 

 1,189 



10, 211 

 3,063 



7,148 



11,121 

 7,144 



3,973 



4,490 

 2,774 



7,264 

 3,973 



3,291 



1 Estimates have been worked out, in so far as possible, to show the approximate number of seals of each 

 class which should be credited to each island. Seals do not, however, haul out in accordance with figures 

 given. Seals born on either island frequent the other island. They travel promiscuously between and 

 haul out on either of the two islands. The total for both islands is, however, approximately correct. 



