CONTENTS -- Continued 



Page 



15. Estimates of the number of yearling male seals, year classes 1964-67, from recov- 



eries of marked male seals, Pribilof Islands, Alaska 19 



16. Estimated number of 2- and 3-year-old male seals, year classes 1963-66, from recov- 



eries of marked male seals, Pribilof Islands, Alaska 20 



17. Survival of male seals, year classes 1961-66, Pribilof Islands, Alaska 20 



18. Fraction of the seal pup population in August of their birth year that is repre- 



sented by the harvest (survival) of male seals on the Pribilof Islands at ages 

 2 to 5 from the same year class, and the mean annual air temperature and 

 count of dead pups on St. Paul Island 21 



19. Data for regression of the kill of 4-year-old male seals on the kill of 3-year-old 



male seals, median date of the kill of 3-year-old male seals, and starting date 



of the kill, year classes 1952-65, St. Paul Island 22 



20. Observed kill of 3- and 4-year-old male seals, St. Paul Island, and estimated num- 



ber of yearling male seals, Pribilof Islands, Alaska, year classes 1961-63 and 1965 22 



21. Weights of seal pups, mean air temperature, and observed kill of 3- and 4-year-old 



male seals, year classes 1957-65, St. Paul Island 23 



22. Estimated number of yearling male seals and kill of 3-year-old male seals, year 



classes 1961-62 and 1964-66, St. Paul Island 24 



23. Forecast of the kill of male seals in 1970, by age, Pribilof Islands, Alaska 25 



24. Forecasted and actual kill of male seals, by age, Pribilof Islands, Alaska, 1969 25 



25. Percentage recovery of tags applied to male seals ^ 2 years old 24 June to 18 July 



1968 and recovered in 1968 and 1969, St. Paul Island 26 



26. Uncoated tags applied to male seals ^ 2 years old 20 June to 17 July 1969 and re- 



covered in 1969, St. Paul Island 26 



27. Number of days between tagging and recovery of uncoated tags applied to male 



seals 5; 2 years old, St. Paul Island. 20 June to 17 July 1969 27 



28. Percentage of 3- and 4-year-old male seals that were recovered on the hauling 



ground where they were tagged, St. Paul Island, 20 June to 17 July 1969 27 



29. Percentage age composition of male seals ^ 2 years old tagged on St. Paul Island, 



June and July 1968 and 1969 28 



30. Recovery of epoxy-coated tags applied to male seals ^ 2 years old that were not to 



be killed, St. Paul Island, 30 June to 17 July 1969 29 



31. Record of radio transmitters and epoxy-coated tags attached to male seals ^ 2 



years old, St. Paul Island, 1969 30 



32. Weights of bacula, male seals ^ 2 years old, St. Paul Island, 22-26 July 1968 30 



33. Weights of paired testes, male seals 5> 2 years old, St. Paul Island, 22-26, June 1968 30 



34. Mean body lengths of female seals, St. Paul Island, North Pacific Ocean, and 



Bering Sea, by month, 1968 31 



35. Percentage of female seals that were pregnant or post partum during the year 



examined, by month, St. Paul Island, North Pacific Ocean, and Bering Sea, 1968 32 



36. Percentage of follicles >5 mm. in diameter in the ovaries of female seals, St. Paul 



Island, North Pacific Ocean, and Bering Sea, by month, 1968 32 



37. Mean and standard deviations of the body lengths of male seals, St. Paul Island, 



17-26 July 1964-69 33 



38. Parts per million (mg./kg.) of pesticides in liver and brain tissues of northern 



fur seals 34 



39. Pesticides in tissues and ingested milk of nursing northern fur seal pups, Pribilof 



Islands, Alaska, 10 November 1969 35 



40. Parts per million (mg./kg.) of pesticides in tissues of California sea lions 35 



vi 



