L AREAS WITH > 30 HOURS 

 [OF SCOUTING TIME 



IUb -■! ■■-■- 



mn 



I I I I I I I I I I I I I I 

 inoinoinoiOQinOtnoinoif' 



RATE OF SIGHTINGS FOR BIRD FLOCKS PER 10 HOURS 



Figure 6. -Frequency of occurrence of different sighting rates of bird flocks in 

 5° X 5°-quarterly units 



LITERATURE CITED 



Royce, William F., and Tamio Otsu. 



1955. Observations of skipjack schools in 

 Hawaiian waters, 1953. U.S. Fish and Wild- 

 life Service, Special Scientific Report-- 

 Fisheries No. 147, 31 p. 



Yamashlta, Daniel T. 



1958. Analysis of catch statistics of the 

 Hawaiian skipjack fishery. U.S. Fish and 

 Wildlife Service, Fishery Bulletin 134, 

 vol. 58, p. 253-278. 



Wilson, Robert C, and Thomas S. Austin. 



1959. Tuna season in the Marquesas. Pacific 

 Fisherman, vol. 57, no. 1, p. 28-31. 



