FISHERY BULLETIN: VOL. 86, NO. 3 



surveyed are shown in Figure 1. Survey design 

 va^ried among the four trips: 



Surveys 1 and 3 were in September 1984 and 1985, 

 respectively. Both were designed to survey harbor 

 porpoise density and abundance from Point Concep- 

 tion, CA to Cape Flattery, WA. An attempt was 

 made to survey the entire coastline on each of these 

 cruises, but several sections of the coast were missed 



(Fig. 1) because of fog and heavy weather. Five 

 observation positions were used on these two 

 surveys. 



Survey 2 was from 24 January to 9 February 1985 

 and was primarily designed to examine seasonal 

 changes in harbor porpoise distribution between 

 Point Conception, CA and Cape Flattery, WA. Data 

 from this cruise were not used for density or abun- 

 dance estimation. 



1 \ \ \ 1 n 49°N 



48° 



- 47° 



10 PORPOISE/KM 



I I 



II 



SURVEY 1 SURVEY 2 SURVEY 3 



SEPTEMBER JANUARY/FEBRUARY SEPTEMBER 



1984 1985 1985 



SURVEY 4 



APRIL/MAY 



1986 



- 46° 



- 45° 



- 44° 



41° 



- 38° 



37° 



36° 



- 35° 



34° 



- 33° 



32° 



123° 



121° 



119° 



117°W 



Figure 1.— Relative sightings per kilometer based on 30-minute latitudinal strata. Lines parallel to the coast indicate areas that were 

 surveyed. Histograms indicate relative numbers of harbor porpoise seen per kilometer of transect, with bars to the left indicating rela- 

 tive numbers in calm seas (Beaufort 0, 1, and 2) and bars to the right indicating relative number in rough seas (Beaufort 3, 4, and 

 5). 



418 



