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Fishery Bulletin 92(3). 1994 



contained up to 16 rockfish species; 73% of the samples 

 contained five or more species. Samples ranging be- 

 tween 251-366 m in depth had up to 13 rockfish spe- 

 cies with 52% of the samples having 5 or more species. 

 Rockfish diversity declined at the deepest sites (-366 m). 



Species assemblages 



A total of 1,468 multispecies hauls were pooled to- 

 gether into a multi-survey, "All Years" analysis. Of 

 the 20 rockfish species examined, 10 were identified 

 as belonging to one of three groups or assemblages. 

 Table 3 lists the results of RGA. The results of CA 

 are shown in Figure 5 and summarized in Table 4. 

 Group 1 consisted of shortspine thornyhead, Pacific 



ocean perch, darkblotched rockfish, and splitnose 

 rockfish, S. diploproa. These four species occurred 

 together in 200 samples at an average depth of 247 

 m (range= 14 1-366 m). The mean rockfish CPUE in 

 these hauls was 45.8 kg/ha of which the assemblage 

 accounted for 829c of the total. Group 2 consisted of 

 canary, yellowtail, and greenstriped rockfish. It also 

 occurred in 200 survey hauls that averaged 150 m in 

 depth (range= 91-291 m). Rockfish catches in hauls 

 containing this assemblage were greater than Group 

 1, averaging 88.8 kg/ha. Canary, yellowtail, and 

 greenstriped rockfish accounted for about 56% of the 

 total rockfish CPUE at these sites. Group 3 consisted 

 of sharpchin, redstripe, and rosethorn rockfish. This 

 group was present in 99 samples. Its depth range 



