332 U. 8S. BUREAU OF FISHERIES 
AGE CLASSES 
The age class of a male seal of the Pribilof Islands herd is deter- 
mined from the length of its body. The classification was derived 
from measurements of a large number of pups branded in 1912 and 
killed in subsequent years. The limits of the various age classes are 
shown in the table following: 
Age classes of male seals, Pribilof Islands 







Length Length 
Age (inches) Age (inches) 
SWOarlineS.t = asa ee ae ne ee Up: to 386.75:))|| 4-year-oldshis22-= <2. = eae 46 to 51.75 
Peviear-OldShje == he ae eee 37 t0140:75) ||| S-year-OldSsa—— =o na eee 52 to 57.75 
Scyvéear-oldsu2-) ~~ =< =na==55=- — 41 to 45.75) || 6-year-0lds= 2-2 == Se 58 to 63.75 
Ages of seals killed on Pribilof Islands, calendar year 19386 
[On basis of classification shown in preceding table] 
St. Paul | St. George 
Age Island Island Total 
ps EATG =) LRT |S ee ee 923 380 1, 303 
SeVOnr— Ol Grn ell OS aes ee ee 41, 394 8, 172 49, 566 
Aa OAT Ol CTIA ULC S se es a cee ee 1, 045 312 1, 357 
BaviGar-Ol GUN AO esa an eee a ee See ee Oe | See oe 2 1 
COWS ee ee ae ee 159 60 219 
MO tal eee aa eee cea ee esas oa ae See ees eee 43, 522 8, 924 52, 446 

1 Cows unavoidably and accidentally killed or found dead. 
Some of the seals recorded in the above tabulation as 2-year-olds 
and 4-year-olds probably were 3-year-olds, as not all male seals of a 
given age fall within the length limits assigned for the males of that 
age. As far as possible, the killings in 1936 were confined to 3-year-old 
males. 
COMPUTATION OF FUR-SEAL HERD 
The computation of the fur-seal herd in 1936 was made by Supt. H. 
J. Christoffers. As of August 10 the total of all classes was 1,689,743— 
a numerical increase of 138,830 over the figures for the preceding year. 
The detailed report will be found on pages 341 to 347 of this document. 
Following is a comparative statement of the numerical strength of the 
various elements of the fur-seal herd in the years 1925 to 1936, 
inclusive. 
General comparison of computations of the seal herd on the Pribilof Islands, 1925 to 















1936 
Classes 1925 1926 1927 1928 1929 1930 
arem) pulls esse 3, 526 4, 034 4, 643 6, 050 7, 187 8, 312 
IBreeging (COWS#.—- tee eee eee 226, 090 244, 114 263, 566 284, 725 307, 491 332, 084 
Surplusibullsa2t2-S are 3, 558 2, 002 4, 827 5, 285 5, 207 3, 963 
Tdleihullseza2 sss See 311 423 972 1, 449 1, 633 1, 899 
6-year-old males__--_---: 4,105 13, 434 13, 450 12, 857 10, 399 5, 612 
5-year-old males___- 16, 792 16, 812 16, 073 13, 001 7, 016 8, 191 
4-year-old males_- 18, 692 17, 872 14, 448 7, 798 9, 102 11, 327 
3-year-old males_- 21, 185 17, 189 9, 730 11, 133 13, 639 14, 871 
29-year-old males_- 43, 515 38, 183 41, 252 49, 087 64, 354 69, 674 
Yearling males_ 52, 091 56, 514 61, 026 65, 861 85, 381 92, 232 
2-vear-Old COWSae noe se ene 49, 786 44, 415 48, 186 57, 061 67, 210 72, 605 
eanline cowss see) scene mink Eee 57, 309 62, 175 67, 131 72, 481 85, 417 92, 247 
IDS a heen ae REE tart 226, 090 244, 114 263, 566 284, 725 307, 491 332, 084 
My Roy 2's i beh eS SLA 723, 050 761, 281 808, 870 871, 513 971, 527 1, 045, 101 





