112 
Fishery Bulletin 110(1) 
Longitude (°N) 
126 120 126 120 
126 120 126 120 
Longitude (°N) 
126 120 126 120 
• 10-100 
o 100-500 
® 500-1000 
• 1000-5000 
O 5000-10000 
Species Code 
0 Northern anchovy 
(Engrautis mordax) 
Q Pacific herring 
( Clupea pallasii) 
O Pacific mackerel 
( Scomber japonicus ) 
Q Jack mackerel 
(Trachurus symmetricus) 
% Pacific sardine 
(Sardinops sagax) 
o No catch 
Figure 1 
(Left panels) Distributions of biomass densities of acoustically detected coastal pelagic fish species (CPS) (sampling 
unit= 10-70 m depth by 2-km trackline distance), from surveys in spring 2006, 2008, and 2010. (Right panels) Locations 
and compositions of catches that included at least one CPS specimen; and the locations of trawls with no CPS catch. 
For each trawl with CPS catch, the proportion of each CPS is represented by the proportion of the area in the circle. 
poses of estimating species compositions and fish-length 
distributions. The trawl locations were generally dis- 
tributed along the acoustic track, some in the vicinity of 
predetermined hydrographic stations. The trawl, a Nordic 
264 (184 m long; with 24-m by 30-m mouth opening) 
with floats on the head rope, was towed at the surface 
at a nominal speed of 3.5 kn for 30 minutes. The trawl 
catches were sorted by species, counted, and weighed. 
Measures of standard length (SL; mm; sardine, anchovy, 
and Pacific herring (Clupea pallasii), hereafter herring), 
fork length (FL, mm; jack and Pacific mackerel), and 
total weight (W; g) were made of all individuals of each 
