Weinberg: Rockfish assemblages off Oregon and Washington 



625 



100 -, 



80 



en 



e 60 



o 40 H 



20 

 



55-150 m \Z3 151-250 



251-366 m 



1977 1980 1983 1986 1989 1992 

 Year 



-'- i 



Figure 3 



Relative abundance of rockfish (Scorpaenidae) expressed as mean catch 

 per unit of effort (CPUE) for selected depth intervals by survey and for 

 all surveys combined. 



overlapped that of Group 2, 99-293 m, but this group 

 was present, on average, in slightly deeper waters, 

 175 m (Fig. 6). Catches of this assemblage seemed to 

 be more localized than were the others, occurring 

 mainly in areas of highly irregular or hard bottom. 

 Catch rates were highest at sites where this assem- 

 blage was present, averaging 159 kg/ha of which 

 these three species accounted for 797c of the total. 



Shortbelly and pygmy rockfish, S. wilsojii, were also 

 grouped together based on very low occurrences, 

 probably an artifact of the grouping process. 



The groupings assigned by the RGA and CA tech- 

 niques were indentical except for two species. These 

 were the assignment of redbanded rockfish to Group 

 1 by RGA only; and the assignment of greenstriped 

 rockfish to Group 3 by RGA and Group 2 by CA. 



