46 
Fishery Bulletin 1 12(1) 
Table 5 
Species clusters produced by hierarchical cluster analysis with data that were stratified by the departure port of fishing vessels. Dif- 
ferent groups were shaded or enclosed in solid or dashed lines to make the table easier to read. Only species that formed identifiable 
clusters were included in the table. Groups A and B represent the slope and shelf clusters, respectively, which were also evident on 
a coastwide basis (Table 2). Group C represents the separate slope rockfish assemblage that formed for some northern ports. For 
some ports, Shortspine Thornyhead and Longspine Thornyhead formed a distinct group, which is represented in the table as Group 
D. Groups E, F, and G were smaller, distinct shelf species assemblages that were evident in the catch of vessels originating from 
some ports in Oregon and California. 
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Bocaccio 
Cowcod 
Pacific Sanddab 
Big Skate 
Pacific Flatnose 
Pacific Grenadier 
B | B 
G 
G 
03 
1 
Sample size (no. of tows) 
1375 
1044 
814 
8992 
338 
3276 
2976 
647 
946 
1956 
1519 
696 
859 
606 
265 
728 
108 
Species 
Sablefish 
A 
A 
A 
A 
A 
A 
A 
A 
A 
A 
A 
B 
A 
A 
Dover Sole 
A 
B 
A 
A 
B 
A 
A 
A 
A 
A 
A 
A 
B 
A 
B 
A 
A 
Shortspine Thornyhead 
A 
D 
D 
D 
A 
A 
A 
D 
A 
A 
A 
D 
A 
D 
A 
A 
Longspine Thornyhead 
D 
D 
D 
A 
A 
D 
A 
A 
A 
D 
A 
D 
A 
Pacific Hake 
A 
A 
A 
B 
A 
A 
A 
A 
A 
A 
A 
B 
B 
B 
A 
A 
Longnose Skate 
A 
A 
A 
B 
A 
A 
A 
A 
A 
B 
B 
B 
A 
A 
Rex Sole 
A 
B 
B 
B 
A 
A 
A 
A 
A 
A 
B 
B 
B 
B 
B 
A 
Arrowtooth Flounder 
A 
B 
A 
A 
B 
A 
A 
A 
A 
A 
A 
Pacific Halibut 
A 
B 
A 
B 
Other Skates 
B 
B 
B 
A 
A 
B 
Pacific Spiny Dogfish 
A 
B 
A 
A 
B 
B 
B 
B 
B 
B 
Spotted Ratfish 
B 
B 
B 
B 
B 
B 
B 
B 
A 
B 
B 
B 
B 
B 
B 
English Sole 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
Petrale Sole 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
Lingcod 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
B 
Flathead Sole 
B 
B 
Pacific Cod 
B 
B 
Splitnose Rockfish 
C 
C 
C 
C 
C 
B 
B 
Redbanded Rockfish 
C 
C 
C 
C 
C 
Pacific Ocean Perch 
C 
C 
c 
Darkblotched Rockfish 
C 
E 
Greenstriped Rockfish 
B 
E 
F 
F 
B 
Canarv Rockfish 
B 
F 
F 
F 
analysis more effectively identified species assemblages 
on local fishing grounds that were frequented by ves- 
sels from the same port. Indeed, vessels departing from 
Avila, where Cowcod was closely associated with Pa- 
cific Sanddab, appeared to fish within an area typically 
ranging less than a degree in latitude. Similarly, the 
range of depths fished by vessels departing from Mon- 
terey was typically less than 180 m. 
The data used in our analysis were from commer- 
cial catches and our results, therefore, reflect species 
assemblage patterns specifically as they pertain to 
fisheries. The data and sampling method used in our 
analyses likely miss finer-scale ecological patterns. 
Fine-scale ecological information that relates to spe- 
cies occurrences could provide further insight into the 
association of bycatch and target species, although col- 
