In early July, post partum females from the 

 Pribilof Islands began to appear here and 

 became the dominant class. The main food 

 species here was Mallotus, with Pleum grammas 

 monopterygius (Atka mackerel) of Secondary 

 importance. 



Feeding seals were common within Unimak 

 Pass where Mallotus was the leading food spe- 

 cies. Occasionally seals would be seen feeding 

 along the edge of tide rips or in weak tide 

 rips. 



The first observations were made on 18 

 May and the last on 8 October. In order to 

 note population changes and movements of 

 fur seals in the area, the analysis has been 

 made by 10-day periods beginning with 21-31 

 May and ending with 1-10 October. 



In classifying the seals, we consider all 

 nulliparous females under 6 years of age to 

 be immature females. AH males from age 1 

 through 8 are classed as immature males. 

 Males 9 years of age and older are classed 

 as bulls. Reproductive condition of fur seals 

 shown in table 4 follows this classification. 

 Males which were observed but not collected 

 and which were definitely large animals are 

 also classed as bulls. 



Figures 3-10 show the areas of seal con- 

 centration and how the Unimak Pass area was 

 sampled. The figures also show age and sex 

 groups present in the study area during vari- 

 ous periods. 



From 21 to 31 May the weather was gen- 

 erally poor; on 6 days the sea was too rough 



Table 4. 



-Sex and reproductive condition of seals collected in Unimak Pass 



and vicinity, 1962 



12 



