FISHERY BULLETIN: VOL. 85, NO. 3 



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Figure 3. — Mean length at age for male walleye pollock from 

 spawning concentrations in five areas of the Bering Sea. 

 Squares indicate fish from the southeast shelf area; triangles, 

 fish from the northwest shelf area; diamonds, fish from the 

 southeast slope area; stars, fish from the northwest slope area; 

 and circles, fish from the Aleutian Basin. 



Figure 4. — Mean length at age for female walleye pollock from 

 spawning concentrations in five areas of the Bering Sea. 

 Squares indicate fish from the southeast shelf area; triangles, 

 fish from the northwest shelf area; diamonds, fish from the 

 southeast slope area; stars, fish from the northwest slope area; 

 and circles, fish from the Aleutian Basin. 



Table 1. — Length, weight (W), and fecundity (F) relationships for Bering Sea walleye pollock resulting from the nonlinear regression. 



The multiple range test on the regression inter- 

 cepts could not distinguish the intercepts of the 

 three lines from the slope and shelf areas. The 

 multiple range test on regression slopes also 

 showed that the slopes of the regressions from the 

 Aleutian Basin and from the southeast slope 

 areas could not be distinguished; however, the 

 intercepts of the regressions from these two areas 

 differed significantly. 



Based on these analyses, the length-fecundity 

 relationships from all shelf and slope areas ap- 

 peared to be similar, and the relationship in these 



areas was different from that seen in the Aleutian 

 Basin. Fecundity increased almost linearly with 

 length in Aleutian Basin walleye pollock; how- 

 ever, pollock larger than about 60 cm are not 

 found in the basin (Okada 1977^ igsS'^; J. 



fiOkada, K. 1977. Preliminary report of an acoustic survey 

 of the pollock stock in the Aleutian Basin and the adjacent 

 waters in the summer of 1977. Document submitted to the 

 annual meeting of the International North Pacific Fisheries 

 Commission, September 1977. Fishery Agency of Japan. 



''Okada, K. 1983. Biological characteristics and abun- 

 dance of the pelagic pollock in the Aleutian Basin. Document 



490 



