FISHERY BULLETIN: VOL. 81, NO. 2 



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FIGURE 2.— Seasonal abundance of harbor seals at Netarts Bay, Oreg., shown by a plot of monthly mean numbers of seals hauled out in the 

 bay. Listed at bottom of figure are monthly maximum numbers of seals observed on haul-out areas. 



cent waters, including Netarts and Tillamook Bays 

 (10.0%),byEverittetal. 6 



Seasonal increases in numbers of harbor seals 

 hauled out in many areas are common during the 

 pupping and molting periods (Johnson and Jeffries 

 1977 7 ; Everitt et al. 1979; Johnson and Johnson 

 1979 8 ; Stewart 1981). Prior to giving birth, female 

 harbor seals may seek out areas preferred for partu- 

 rition and nursing. Roffe (1981) described the de- 

 parture of harbor seals from the Rogue River 

 by the end of April, presumably to use sites more 



and behavior of harbor seals in Washington State waters. The Ever- 

 green State College, Olympia, WA 98505, 121 p. 



6 Everitt, R. D., R. J. Beach, A. C. Geiger, S. J. Jeffries, and S. D. 

 Treacy, 1981. Marine mammal-fisheries interactions on the Co- 

 lumbia River and adjacent waters, 1980. (First] Annual Report 

 March 1, 1980 to October 31, 1980. Wash. State Dep. Game to 

 Northwest and Alaska Fish. Cent., Natl. Mar. Mammal Lab., Natl. 

 Mar. Fish. Serv., NOAA, Seattle, WA 98115, 109 p. 



'Johnson, M. L., and S. J. Jeffries. 1977. Population evaluation of 

 the harbor seal (Phoca vitulina richardi) in the waters of the State of 

 Washington. Contract Report to the U.S. Marine Mammal Com- 

 mission, Washington, D. C, 27 p. National Technical Information 



Table 1.— Maximum pup counts, number of non- 

 pup animals present during counts, and number of 

 pups expressed as a percentage of the total number 

 of animals present for the 1978, 1979, 1980, and 

 1981 harbor seal pupping seasons at Netarts and 

 Tillamook Bays, Oreg. 



Service, 5285 Port Royal road, Springfield, VA 22151 



"Johnson, B. W., and P. A. Johnson. 1979. Population peaks dur- 

 ing the molt in harbor seals. In Abstracts from presentations at the 

 Third Biennial Conference of the Biology of Marine Mammals, Oc- 

 tober 7-11, 1979, Seattle, Wash., p. 31. 



294 



