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Fishery Bulletin 1 10(1 ) 
Table 3 
Estimates of biomass (million metric tons; Mt) for sardine (Sardinops sagax), jack mackerel (Trachurus symmetricus), and Pacific 
mackerel (Scomber japonicus), and their coefficient of variation (CV) and 95% confidence intervals (CI g5 ) values versus survey 
year and stratum (see Figs. 2-4). 
Spring 
Species 
surveys 
Stratum 
Biomass (Mt) 
CV (%) 
CI 95 (Mt) 
Pacific sardine (Sardinops sagax) 
2006 
1 
1.947 
30.4 
0.897-3.139 
2008 
1 
0.047 
45.8 
0.017-0.104 
2 
0.704 
9.3 
0.579-0.823 
1+2 
0.751 
9.2 
0.611-0.870 
2010 
1 
0.357 
43.3 
0.094-0.690 
Jack mackerel (Trachurus symmetricus) 
2006 
1 
0.285 
35.8 
0.078-0.378 
2008 
1 
0.078 
32.1 
0.032-0.129 
2 
0.069 
47.5 
0.019-0.140 
1+2 
0.147 
28.4 
0.075-0.232 
2010 
1 
0.323 
36.7 
0.132-0.586 
Pacific mackerel (Scomber japonicus) 
2006 
1 
0.047 
61.6 
0.006-0.109 
2008 
1 
0.018 
51.8 
0.005-0.037 
2010 
1 
0.018 
45.7 
0.001-0.034 
