44 
Fishery Bulletin 112(1) 
Distances 
0.0 
I 
0.2 
0.4 
_ 1 _ 
0.6 
_J 
0.8 
I 
1.0 
Pacific Grenadier 
Flathead Sole 
Pacific Cod 
Longspine Thornyhead 
Grenadiers t 
Pacific Flatnose ' 
Aurora Rockfish 
Mixed Thornyheads 
Yelloweye Rockfish 
Other Sanddabs — 
Big Skate 
> 
Darkblotched Rockfish 
Pacific Sanddab 
Greenstriped Rockfish 
Longnose Skate 
Pacific Flake — 
Pacific Halibut 
Pacific Spiny Dogfish — 
Sablefish — 
Other Skates 
Spotted Ratfish 
Arrowtooth Flounder — 
Dover Sole — 
Rex Sole 
English Sole 
Lingcod 
Canary Rockfish 
Petrale Sole 
Other Rockfish 
Rosethorn Rockfish 
Pacific Ocean Perch 
Redbanded Rockfish — 
Shortspine Thornyhead 
Splitnose Rockfish 
Bocaccio 
Widow Rockfish 
Cowcod 
Figure 3 
Dendrogram of species clusters determined with hierarchical cluster analysis and based 
on data from all years, but including only data from tows in which Canary Rockfish were 
caught. This method was used to evaluate whether clustering could be identified for tows 
in which rebuilding species were caught. As the figure shows, the method results in a 
single large cluster of all of the other species that were most common in tows where the 
rebuilding species of interest were caught. The distance axis represents dissimilarity mea- 
sures from the cluster analysis. 
and Petrale Sole. Sand Sole and Starry Flounder were 
not included in the current analysis because they oc- 
curred on fewer than 5% of observed tows. However, 
the other components of this assemblage were consis- 
tent with our findings. Rogers and Pikitch (1992) iden- 
tified 2 deepwater assemblages, 1 consisting primarily 
of Sablefish and Dover Sole, and a second that included 
Darkblotched Rockfish, Pacific Ocean Perch, Splitnose 
Rockfish, Yellowmouth Rockfish ( Sebastes reedi), and 
Sharpchin Rockfish (S. zacentrus ). The results pre- 
sented here were similar when data from port groups 
along the northern coast were analyzed. These simi- 
larities are expected because the data used by Rogers 
and Pikitch (1992) were collected between 42°60' and 
48°42' north latitude. 
Contrary to the current analysis, Rogers and 
Pikitch (1992) found that 3 of the rockfish now identi- 
fied as rebuilding species formed a cluster with other 
species. Their results show Bocaccio, Canary Rockfish, 
and Yelloweye Rockfish were part of a nonflatfish shelf 
grouping that included Yellowtail Rockfish ( Sebastes 
flavidus), Sharpchin Rockfish, and Lingcod. In the 
late 1980s, when the data used by Rogers and Pikitch 
(1992) were being collected, thousands of metric tons 
of Bocaccio, Canary Rockfish, and Yelloweye Rockfish 
were being landed each year. That level of fishing is 
