Jacobson et al.: Depth distributions and time-varying selectivities for various bottom fishes 
315 
Table 2 
Depth stratum area (in 1000 km' 2 ), percentage of total area, and nominal fishing effort (h/yr) by depth stratum for bottom trawls 
in the southern subarea (36°00'N -43°00'N) during 1978-96. Nominal fishing effort was calculated from California and Oregon 
bottom trawl logbook data as total hours trawled for trips catching any thornyheads, Dover sole, or sablefish. 
Year 
Area 
% total 
Depth ( fm ) 
100-199 
3.472 
area 16 
200-299 
3.293 
16 
300-399 
3.732 
18 
400-499 
3.733 
18 
500-599 
3.716 
18 
600-699 
3.158 
14 
1978 
8584 
4606 
8673 
3533 
743 
46 
1979 
11,707 
6980 
11,792 
4035 
1973 
50 
1980 
8200 
4992 
6765 
3171 
817 
95 
1981 
9346 
7518 
11,163 
3635 
1246 
6 
1982 
10,941 
7997 
10,698 
5142 
1559 
15 
1983 
19,481 
13,375 
17,037 
9382 
1662 
62 
1984 
10,471 
7972 
8262 
6090 
2031 
5 
1985 
13,642 
8599 
9603 
7629 
4782 
41 
1986 
8914 
10,861 
11,228 
8184 
5262 
60 
1987 
7496 
8890 
7712 
5057 
4001 
191 
1988 
10,143 
8839 
5384 
7575 
9843 
206 
1989 
8646 
9120 
6834 
10,016 
11,533 
398 
1990 
7615 
8630 
6297 
8459 
12,717 
345 
1991 
9408 
15,428 
11,660 
8493 
6776 
567 
1992 
8327 
14,616 
12,602 
10,356 
10,873 
512 
1993 
8424 
13,488 
15,861 
9170 
13,142 
1241 
1994 
5999 
9522 
10,444 
8452 
13,743 
3649 
1995 
8892 
12,556 
13,966 
13,588 
14,573 
1542 
1996 
9825 
13,766 
15,608 
13,549 
9688 
1887 
Table 3 
National Marine Fisheries Service (NMFS) bottom trawl slope survey data used to estimate depth distributions for Dover sole, 
shortspine thornyhead, longspine thornyhead, and sablefish. The National Oceanic and Atmospheric Administration ship Miller 
Freeman and standard bottom trawl survey gear (NMFS poly Nor’eastern otter trawl with small mesh liner, see text) were used 
in all surveys. Only tows with satisfactory performance were used. “Cruise ID” gives codes used in NMFS cruise reports. “Map 
symbols” are used in Figure 1. 
Cruise ID 
Start and end 
Min and max latitude 
(°N lat.) 
Min and max depth 
(fm) 
Number of 
tows used 
Map 
symbols 
889 
Nov 1988 
44.11 
121 
53 
A 
Dec 1988 
45.37 
682 
9011 
Oct 1990 
40.52 
122 
101 
B 
Nov 1990 
42.97 
680 
9112 
Oct 1991 
38.39 
108 
83 
C 
Nov 1991 
45.34 
684 
9210 
Oct 1992 
45.51 
109 
76 
D 
Nov 1992 
48.00 
692 
9312 
Oct 1993 
43.07 
101 
110 
E 
Nov 1993 
45.50 
683 
9512 
Oct 1995 
40.53 
120 
105 
F 
Nov 1995 
42.96 
672 
9615 
Oct 1996 
43.09 
102 
199 
G 
Nov 1996 
48.07 
690 
9711 
Oct 1997 
36.31 
103 
151 
H 
Nov 1997 
48.07 
689 
