Murie et al.: Distribution and activities of Sebastes spp. 



317 



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 o 

 o 



I 

 CO 



CO 



z 



LU 



Q 



E 

 o 

 o 



I 

 CO 



E 



CO 



2 

 LU 

 Q 



14 • 

 12 ' 



10 ' 

 8  

 6- 

 4  

 2  

  



A 



\ \ \ \ \ \\\N* \ V k \ \ X V \ \ \ 



f / . t I I t * t / •/./•, t * * / * 



\\S»^ S X \ \ \ \N.*\ •» S S \ V 



'\'>' \'\'\ \ \ \ \ \ \ \ \ \ \' S /\W\ 



21-40 41-60 61-80 81-100 



B 



D SMALL 

 □ LARGE 



'. 



L. 





1 



F2 



I 



21-40 



41-60 61-80 



DEPTH (m) 



81-100 



Figure 3 



(A) Overall median densities of all quillback rock- 

 fish, Sebastes maliger, over depth; and (B) median 

 densities of small and large quillback rockfish over 

 depth. Vertical bars represent the interquartile 

 ranges (Q 025 to Q 075 ). Median density of quillback 

 rockfish in depths >100 m was zero. 



Tiger rockfish accounted for 4%, and copper rockfish 

 3%, of the rockfish encountered; both were most 

 abundant in 41-60 m (0.6 fish- 100m" 2 ). Yellowtail 

 rockfish also represented 3% of all rockfish observed 

 with their density reaching a maximum of 6.3-6.6 

 fish-lOOm -2 in the 41-80 m depth intervals. 

 Greenstriped rockfish (n=8), yelloweye rockfish (n 

 =5), and one unidentified rockfish each represented 

 less than 1% of all observed rockfish. Greenstriped 

 and yelloweye rockfish both occurred in relatively 

 deeper waters (Table 2). 



The size of tiger rockfish was not correlated with 

 depth (P=0.27, n = 15) and only relatively large fish 

 were seen from the submersible (Table 2). Copper 

 rockfish size was positively correlated with depth 

 (r 2 =0.36, P=0.02, n=15), and no small copper rock- 

 fish were seen at depths greater than 40 m. Yellow- 

 tail rockfish seen were all relatively large fish (Table 

 2) and their size was not correlated with depth 

 (P=0.46, n=21). All greenstriped rockfish observed 

 were small (Table 2). Two juvenile yelloweye rockfish 

 ( 18-20 cm TL) were observed at depths greater than 

 95 m and three subadult and adult yelloweye rockfish 

 (36-46 cm TL) occurred between 80 and 90 m. 



Habitat distribution 



Density of quillback rockfish differed among survey 

 sites (P=0.001). Densities observed at the Elbow 

 Point and McKenzie Bight sites were similar 

 (P=0.236), with a pooled median density of 5.7 

 fish- 100m 2 . In contrast, the median density of quill- 

 back rockfish at Sheppard Point was zero. 



Overall, quillback rockfish density was highest in 

 areas of complex habitat (5.8 fish- 100m -2 ), followed 



