Table 67. — Apparent bathymetric distribution of arrowtooth 

 flounder abundance within the 1976 Bering Sea slope 

 subarea.' 









Mean CPUE' 



Bottom depths 



(m) 



No. of samples 



(kg/ km) 



200-249 





10 



27.6 (1.0-103.8) 



250-299 





8 



28.5 (6.0-76.0) 



300-349 





9 



34.8 (7.6-62.1) 



350-399 





7 



15.8 (2.4-58.4) 



400-449 





7 



75.5 (2.8-425.0) 



450-460 





3 



7.4 (0.0-14.7) 



'See Figure 3. 



? Mean catch per unit fishing effort, with range in paren- 

 theses. 



Table 68. — Apparent bathymetric distribution of Pacific 

 halibut abundance within the 1976 Bering Sea slope subarea. 1 







Mean CPUE ! 



Bottom depths (m) 



No. of samples 



(kg/km) 



200-249 



10 



12.0 (0.0-47.7) 



250-299 



8 



10.1 (1.2-33.7) 



300-349 



9 



7.3 (0.0-16.8) 



350-399 



7 



10.2 (0.4-22.2) 



400-449 



7 



14.9 (0.0-45.3) 



450-460 



3 



32.1 (9.1-57.0) 



'See Figure 3. 



•'Mean catch per unit fishing effort, with range in paren- 

 theses. 



Community structure. — Although the total numbers of fish 

 and invertebrate species captured were large, a few principal 

 species dominated the catches of both the 1975 and 1976 surveys. 

 In general, the lists of important species were the same between 

 surveys. And importantly, relationships within the lists of prin- 

 cipal species from each survey, as measured by the extent of co- 

 occurrence between species and regional distributions of co- 

 occurring species groups, were also remarkably similar. 



Despite partial predictability of principal species and their 

 organization over large geographical areas, at any specific loca- 

 tion on the eastern Bering Sea continental shelf the relative species 

 composition of the demersal fish community may be expected to 

 undergo large seasonal variations. These changing relationships 

 presumably result from seasonally driven variations in the over- 

 lapping distributions of resident (nonmigrating) and transient 

 (migrating) species populations, and changes in their relative den- 

 sity distributions. 



ACKNOWLEDGMENTS 



This work was supported by the National Oceanic and Atmos- 

 pheric Administration (NOAA) as a part of the Marine Monitor- 

 ing, Assessment and Prediction Program of the National Marine 

 Fisheries Service, and the Bureau of Land Management as a part 

 of the NOAA Outer Continental Shelf Environmental Assess- 

 ment Program. 



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