CONTENTS 



Page 



Introduction 2 



Part I. Fur seal investigations, Pribilof Islands, Alaska, 1969 3 



Age classification and number of seals killed, by sex 3 



Survey data 5 



Living adult male seals counted 5 



Living pups weighed 6 



Dead seals counted that were older than pups 6 



Dead pups counted 7 



Pathology 7 



Malnutrition 7 



Hookworm disease 10 



Microbial infection 10 



Multiple hemorrhage-perinatal complex 11 



Marking 11 



Application of marks 11 



Pups 11 



Flipper marking 11 



Cryogenic marking 11 



Male seals ages 1 and 2 years 12 



Recoveries of marked seals 13 



Marked seals 13 



Tag loss 13 



Tag vs. other marks 14 



Population estimates 14 



Number of seal pups born 15 



Number of male seals ages 1 to 2 years 17 



Forecast of the kill of male seals in 1970 18 



Forecast of the kill of 4-year-old male seals 21 



Regression of the kill of male seals at age 4 on the kill at age 3, median date of the 



kill at age 3, and the starting date of the kill 21 



Estimate of the kill of 4-year-old male seals from the yearling male seal popula- 

 tion estimate 22 



Combined estimates of the kill of 4-year-old male seals on St. Paul Island 23 



Forecast of the kill of 3-year-old male seals 23 



Regression of the kill of male seals at age 3 on weights of pups and on air temperature 23 

 Estimate of the kill of 3-year-old male seals from the yearling male seal popu- 

 lation estimate 23 



Estimate of the kill of 3-year-old male seals from the count of dead pups and the 



pup population estimate 24 



Combined estimates of the kill of 3-year-old male seals on St. Paul Island 24 



Forecast of the total kill of male seals 24 



Special studies 25 



Activity of young male seals on land 25 



Tagging 25 



Male seals tagged in 1968 and recovered in 1968 and 1969 25 



Male seals tagged in 1969 and recovered in 1969 26 



Discussion of tagging 27 



Male seals tagged in 1969 and released after capture 28 



Telemetry 28 



iii 



