FISHERY BULLETIN: VOL. 78, NO. 3 



□ 



l/l 

 M 

 LJ 

 Ul 



Ct: 



Q. 



LL 



□ 



X 



UJ 



Q 



Figure l. — Comparison of precision-density 

 curves of four different sampling strategies for 

 Sebastes alutus: 1) Three trawls/d with gear 

 at depth for 2.1 h, 2) four trawls/d with gear at 

 depth for 1.2 h, 3) five trawls/d with gear at 

 depth for 0.5 h, and 4) six trawls/d with gear at 

 depth for 0.3 h. 



2.0 



1 .8 



1 .5 



1 .3 



1 .0 



.a 



.5 , 



.OJ 



° SOnPLING STRQTEGY 1 



I SanPLlNO STRQTEGV 2 



° SPnPLINO STRQTEGV 3 



^ SOHPLING STRQTEGY 4 



-♦ —  — •— 



-• —  — ♦— 



-♦ —  — o . 



-e — e — e — e — b — b — e — o — g — e — & — e — e — e — e — b — e — o — e — e — e — o — < \ 



0.0 20.0 40.0 60.0 BO.O 100.0 



DENSITY I NUMBERS/Kn . 1 



120.0 



5 .0 



2: 

 □ 



I— I 



LJ 



a. 



□ 



X 



UJ 

 Q 



Figure 2. — Comparison of precision-density 

 curves of four different sampling strategies for 

 Sebastes fJavidus: 1) Three trawls/d with gear 

 at depth for 2.1 h, 2) four trawls/d with gear at 

 depth for 1.2 h, 3) five trawls/d with gear at 

 depth for 0.5 h, and 4) six trawls/d with gear at 

 depth for 0,3 h. 



4 .0 



3.S 



3 .0 



2 .5 



2 .0 



1 .5 



1 .0 



0.0 



° SQnPLING STRPTEGY 1 



' SOMPLING STROTEGY 2 



o SOnPLING STRQTEGY 3 



^ SPHPLING STRQTEGY 4 



0.0 20.0 40.0 60.0 BO.O 100.0 



DENSITY I NUMBERS/KM . ) 



120.0 



672 



