Table 35. --Percentage of female seals that were pregnant or 



post partum during the year examined, U by month, 

 St. Paul Island, North Pacific Ocean, \1 and Bering 

 Sea, 1968 



[Numbers in parentheses show sample sizes] 



St. Paul Island 



Age 



August 



North Pacific Ocean 



Ma\ 



June 



July 



August 



Bering Sea 



July 



August 



1/ Most of the females had or would have given birth to their 

 pups in June or July. 



2/ Two seals were collected off Southeastern Alaska and 33 

 were taken in and between the Gulf of Alaska and Unimak Pass. 



Table 36. --Percentage of follicles >5 mm. in diameter in the 

 ovaries of female seals, St. Paul Island, North 

 Pacific Ocean, L' and Bering Sea, by month, 



1968 



[Numbers in parentheses show sample size] 



St. Paul Island 



North Pacific Ocear 



A ugust 



May 



July 



August 



Bering Sea 



July August 



1/ Two seals were collected off Southeastern Alaska and 33 

 vere taken in and between the Gulf of Alaska and Unimak Pass. 



Organochlorine Pesticides in Northern 

 Fur Seals, California Sea Lions, and 

 Birds, 1968-69 



Tissue samples from several marine mam- 

 mals and birds were used for this study: fur 

 seals and birds were collected on St. Paul 

 Island in 1968 and 1969, fur seals were taken 

 off the Washington coast in 1969, and sea lions 

 were collected on San Miguel Island, Calif., in 

 1969. We assumed that all of the animals were 

 healthy. The tissues were frozen immediately, 

 then transported on dry ice to the National 

 Marine Fisheries Service Pesticides Field Sta- 



tion, Gulf Breeze, Fla., where they were an- 

 alyzed for organochlorine pesticides by Alfred 

 J. Wilson, Jr., Research Chemist. 



Pesticides were found in liver and brain 

 samples of 3 of 7 fur seal fetuses and in all 

 of 11 fur seals 1 to 11 years old (table 38). 

 Muscle, brain, liver, blubber, and ingested milk 

 samples from five nursing fur seal pups also 

 contained pesticides (table 39). 



Trace amounts of polychlorinated biphenyls 

 (PCB) were found in samples of muscle, liver, 

 and fat from two kittiwakes and one glaucous- 

 winged gull. The muscle, liver, and brain tis- 

 sues of the gull contained 0.73, 0.13, and 0.41 

 ppm, respectively, of DDE. 



32 



