FISHERY BULLETIN: VOL. 86, NO. 3 



Figure 1.— International North Pacific Fisheries Commission statistical areas sampled during the Gulf of Alaska 

 portion of the Japan-U.S. cooperative longline survey, 1979-86. 



sablefish were sexed, some were tagged and re- 

 leased, and others were sampled for otoliths and 

 scales. Detailed survey methods are described in 

 Sasaki et al. (1983). 



STATISTICAL METHODS 



The catch data were stratified because of differ- 

 ences in the catch rate by depth. Assignment of the 



150 - 



U 



z 

 o 



lU 



c 



100- 



0.5 



5.5 



10.5 15.5 



CATCH PER HACHI 



20.5 



25.5 



446 



Figure 2.— Frequency distribution of sablefish catch per hachi (numbers) by year, station, and strata, 



1979-86. 



