314 



Fishery Bulletin 100(2) 



also exhibited this trend but not to the same degree as 

 age-0 and age-1 pollock. 



Stations with low-density concentrations of juvenile pol- 

 lock were examined with respect to bottom depth, geo- 

 graphic area, and distance from land (Fig. 9). For all ages 

 of juvenile pollock there was a marked difference between 

 1984-87 and the 1990s. A gi'eater proportion of stations 

 with age-0 pollock was observed at bottom depths <200 m 

 than at deeper depths, especially in 1996. Age-0 pollock 

 occurrence increased in the Chirikof and Shumagin re- 

 gions before also increasing in the Kodiak region in 1996. 

 Age-0 pollock also occurred more frequently at distances 

 <60 nmi from land. 



In 1990, the proportion of stations with low-density con- 

 centrations of age-1 pollock increased the most at bottom 

 depths >200 m, before the same increasing trend was al- 

 so observed at shallower bottom depths in 1993 and 1996 



I E1I>IS4  1 1)87 



DIWO BIW1 

 aiWh 



U)li-200 2(lll-.l(Kl 



Bottom deptti (m) 



Shumagin fhirikot 



Geographic region 



:()-4)) 4()-M) 



Distance from land (nmi) 



Figure 5 



The proportion of stations within each category of physical 

 characteristic where walleye pollock were found . 



(Fig. 9). The increase was observed across all geographic 

 regions and at all distances from land. 



