Fishery Bulletin 1 10(2) 
A Increasing trends 
250.000 
200.000 
150.000 
100.000 
50,000 
0 
longspine thornyhead 
( Sebastolobus altivelis ) 
ft ft ft 
ft ft 
B Nonsignificant trends 
Dover sole 
( Microstomus pacificus) 
Pacific grenadier 
12 ooo ( Embassichthys bathybius) 
yellowtail rockfish 
(Sebastes flavidus) 
40.000 
20.000 
0 
3000 snakehead eelpout 
( Lycenchelys crotalinus) 
20,000 
15.000 
10.000 
5000 
Pacific cod 
(Gadus macrocephalus) 
ft i 
a i . 
SB -01 , L 
2003 2004 2005 2006 2007 2008 2009 2010 
Figure 2 
(A) Increasing and (B) nonsignificant trends in annual, coast-wide demersal 
biomass indices (in metric tons, t) for 12 taxa caught in the Northwest Fisheries 
Science Center’s West Coast Groundfish Bottom Trawl Survey, 2003-10. Taxa 
are ranked from highest (top) to lowest (bottom) biomass for each category, 
and standard errors are shown. All six species exhibiting significant (P<0.05) 
or near-significant (P<0.10) increases in biomass indices over time are shown; 
however representative examples of species with nonsignificant trends (36 spe- 
cies) are shown only for the most abundant taxa for each subgroup described 
in Table 1. 
