U. S. BUREAU OF FISHERIES 
168 
Complete computation of fur seals, Pribilof Islands, as of August 10, 1938—Con. 


St. Paul | St. George 





Class Island Island Total 
Surplus bulls, 7 years old and over, estimated: | 
6-year-old males, Aug. 10, 1937-------=.------------_--_-----_--- 12, 670 2, 518 15, 188 
INaturall montality, 20) percentes=-s- 286 as] 26a se nee 2, 534 504 3, 038 
7-year-old-males, Aug 10; 1938==- --- —-----_-_ 3-5 S 10, 136 2,014 12, 150 
Surplus) bulls;~Aue 110103 7 ane (2) (2) 9, 140 
INtural MOEtalitys GOCE COM Gs ssa a a eee ee ees | te ee ee 2, 742 
Remaining surplus foMlQse tae = = = ae eee OS A hea pe 6. 398 . 
Breeding bullsiot03 sees = nea ne ee 13, 205 2, 926 16, 131 
Niaturalimortality, 30 penecent=-----=—-— === — = oe en 3, 962 878 4,840 — 
1937 bulisiremainin gine 988) —=- 22.22 oe eee 9, 243 2, 048 11, 291 — 
Breeding. bullsofl9384e=-722-~~-=.--.-2-.-2-2 <n ee 12, 507 2, 778 15, 285 
1937 bulls remaining, deducted 9, 243 2, 048 11, 291 
Increment of new bulls in 1938__------------------------------ 3, 264 730 3,994 
7-year-old males computed for 1938__---------------------------- 10, 136 2,014 12, 150 
Surplusibullsicomputedsfor)938s22— 222 22 seen ae ee ee ee |e ee eee eae 6, 398 
Motalitheoreticalibullistocksfor 193822 --s— nese eeee nee | renee | nee eee 18, 548 
New, increment of breeding bullsideducted 222-22 =enen seen | pee eee | See eee 3, 994 
Surplus pullsynslO38ease ses 2S ee een eee ae eee | eee eee 14, 554 
50 percent deducted for losses due to natural causes and errors 
inilossipercentages)ini previous years. === === ee ee ae een ne ee 7, 277 
Surplus bulls; Aug (1031938... -. +. Seen eee oth SE | ee 7, 277 

3 Estimates have been worked out, insofar as possible, to show approximately the number of seals of 
each class which should be credited to each island. The seals, however, do not haul out in accordance 
with figures given. Seals born on either island frequent the other island. They travel promiscuously 
between the two islands and haul out on either one. The total for both islands, however, is approximately 



correct. 
Recapitulation 
Class Total Class Total 
BUDS ease nee oe ee ee ee 614; 499’ || ‘5-=vyear-old males_i=:---25-2=----:-=---- == 18, 201 
COWS. oo bees ae na eee ane oe 6145;499))|5G-vear-oldimaless= === 22 =a = = eeeees 17, 269 
Miarem bulls: 22 2222 see een e as 1351600||SSunplus)bulls2tsss- 2. eee eee Up eies 
die ybulls 224-2 = a ee ee ee eee 2, 125 
Yearling females. 52--s-4--—=- 2-25 --- == 156, 470 otal 19388. - 2 == ssc te 1, 872, 438 
NWearling males#e= 2222 - se Seer Sas hoe 1495232) ||| Potalyl9372- —* 2. + 3s eee 2 eee 1, 839, 119 
2-year-old females® - -.2225252-22---- 2122 123, 150 
2=Voar-0l Gsm aleses soe seen eee aon ee See 107,003 || Numerical increase, 1938_--------------- 33, 319 
osVeat-0l Gum alesse 22 ee eae eee 32: 278 ||| Percent increase; 1938). 22! 2 1.81 
4-vear-old: males”. ° 2222-24 -e== sae aaa e 2 24, 275 

