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P0LL0CK FEMALES 



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Figure 34. — Length-maturity relationships observed from walleye pollock taken during the 1976 Bering Sea spring trawl survey. 



of these results to the actual population is dependent upon the 

 degree of influence of the following potential sources of bias: If 

 large, spawning individuals were less vulnerable to the trawl than 

 nonspawners, as a result of an off-bottom distribution and/or 

 avoidance, then the estimated numbers and overall relative popu- 

 lation proportions of mature and spawning individuals may have 

 been substantially underestimated; and differential vulnerability 

 to the trawl of immature and mature individuals within each 



centimeter length class may have affected the estimate of propor- 

 tion mature at each length. 



Yellowfin sole. 



Distribution and abundance. — During the entire survey period, 

 April-June 1976, yellowfin sole were taken over a broad region of 

 the survey area along the central continental shelf and in Bristol 



49 



