Gunderson: Spatial patterns in the dynamics of slope rockfish stocks 
225 
140,000 
CMTtCDCOOCM^tCDOOOCM^cpoOOCM 
cococo<or^t''-r^h'-h'cooocoo6oocr>o> 
Year 
Figure 4 
Estimated biomass (t) of Pacific ocean perch in the U.S. Vancouver-Columbia 
management area based on Stock Synthesis analysis (Ianelli et al. 3 ) and ex- 
trapolated CPUE ( 1968 CPUE = q x 1968 Stock Synthesis biomass, where q is 
the catchability coefficient) at the northern Washington index sites for the years 
1968-92. 
the case of Pacific ocean perch, allozyme differences 
follow a cline from the Washington coast to the Bering 
Sea rather than show discrete differences between 
stocks (Seeb and Gunderson, 1988). Strong year 
classes of Pacific ocean perch tend to occur synchro- 
nously throughout the Oregon-British Columbia 
region (Gunderson, 1977; Hollowed, et al., 1987), in- 
dicating recruitment strength is determined by 
oceanographic conditions operating over broad spa- 
tial scales. 
