Keller et al : Variations in eastern North Pacific demersal fish biomass, 2003-10 
213 
Table 1 (continued) 
Depth (m) 
Hauls 
(No. of hauls) 
Common name 
Scientific name 
mean 
min. 
max. 
Rockfish — slope 
aurora rockfish 
Sebastes aurora 
456 
129 
814 
689 
bank rockfish 
Sebastes rufus 
267 
101 
499 
91 
blackgill rockfish 
Sebastes melanostomus 
406 
133 
647 
264 
darkblotched rockfish 
Sebastes crameri 
226 
84 
538 
920 
Pacific ocean perch 
Sebastes alutus 
279 
87 
715 
344 
redbanded rockfish 
Sebastes babcocki 
269 
84 
550 
398 
rougheye rockfish 
Sebastes aleutianus 
291 
124 
798 
253 
splitnose rockfish 
Sebastes diploproa 
287 
68 
559 
1107 
Thornyhead rockfish 
longspine thornyhead 
Sebastolobus altiuelis 
767 
104 
1271 
1844 
shortspine thornyhead 
Sebastolobus alascanus 
611 
67 
1268 
2590 
Deep (>650 m) 
brown cat shark 
Apristurus brunneus 
672 
82 
1241 
1717 
California slickhead 
Alepocephalus tenebrosus 
909 
477 
1268 
1097 
deepsea sole 
Embassichthys bathybius 
874 
276 
1271 
1116 
giant grenadier 
Albatrossia pectoralis 
943 
443 
1271 
838 
grooved Tanner crab 
Chionoecetes tanneri 
782 
64 
1271 
1431 
Pacific flatnose 
Antimora microlepis 
931 
262 
1271 
890 
Pacific grenadier 
Coryphaenoides acrolepis 
915 
313 
1271 
994 
roughtail skate 
Bathyraja trachura 
941 
107 
1271 
622 
snakehead eelpout 
Lycenchelys crotalinus 
893 
63 
1264 
783 
twoline eelpout 
Bothrocara brunneum 
861 
343 
1271 
898 
Table 2 
Akaike information criterion (AIC), P, coefficient of determination (r 2 ), and zf, for different models fitting annual biomass indices 
versus year, Pacific Decadal Oscillation (PDO) values, and both variables for three subgroups of demersal species determined by 
the occurrence of strong recruitment during the late 1990s (with recruitment: « = 13, without recruitment: ra=ll, and unknown: 
n = 38) and overall (n = 62). The best model for each group is determined by the minimum AIC value ( ! ) within each category, with 
lower AIC values indicating a better fit. Additionally, when A l values are <7 ( 2 ) there is some support for the alternative model. 
Similar results are shown for species richness subdivided by depth strata (shallow 55-183 m; mid-depth 184-549 m; deep 
550-1280 m and overall 55-1280 m). 
With year 
With PDO 
With 
year and PDO 
Models: 
AIC 
P 
r 2 
AIC 
P 
r 2 
AIC 
P 
r 2 
4 
Biomass 
with recruitment 
-8.9 1 
0.007 
0.87 
-4.8 
0.02 
0.62 
-1.7 
0.008 
0.93 
7.2 
without recruitment 
2.8 
0.002 
0.81 
-0.6 J 
0.001 
0.84 
5.6 
0.01 
0.91 
6.2 2 
unknown recruitment 
0.8 
0.07 
0.45 
-5.1 
0.01 
0.70 
-8.7 1 
0.0002 
0.99 
9.5 
all 
-6.3 
0.001 
0.85 
-7.5 
0.002 
0.81 
-1 1.9 7 
0.0001 
0.99 
5.6 2 
Richness 
shallow 
23.1 
0.15 
0.34 
15. 7 7 
0.009 
0.71 
18.4 
0.10 
0.75 
7.4 
mid-depth 
17.5 
0.06 
0.49 
12. 6 ; 
0.01 
0.68 
16.1 
0.12 
0.73 
4.9 2 
deep 
18.7 
0.28 
0.19 
16.0 
0.20 
0.20 
12. 8 1 
0.05 
0.84 
5.9 2 
all 
15.9 
0.08 
0.45 
7.6 1 
0.004 
0.80 
13.4 
0.08 
0.79 
8.3 
