Table 2. Accuracy of logbook discard records based on matched logbook and observer tows.
The "Discards (Lg>0 & Ob>0)" columns are the discard amounts for those matched tows where both the logbook and the observer reported non-zero discards for the given species.
|
|
Tows w Discard
|
|
Discards (all tows)*
|
|
Discards (Lg>0 & Ob>0)*
|
| Species
|
N Trips
|
N Tows
|
Lg no Ob
|
Lg+Ob
|
Obs
|
%Agree
|
Log
|
Obs
|
ratio
|
Log
|
Obs
|
ratio
|
| All Fish
|
118
|
919
|
3
|
889
|
913
|
97.4%
|
906.55
|
1151.91
|
0.79
|
906.48
|
1141.71
|
0.79
|
| Dover sole
|
112
|
644
|
20
|
66
|
398
|
16.6%
|
24.37
|
29.75
|
0.82
|
19.48
|
20.53
|
0.95
|
| Sablefish
|
112
|
657
|
39
|
310
|
505
|
61.4%
|
81.90
|
110.39
|
0.74
|
73.84
|
97.77
|
0.76
|
| Longspine
|
89
|
332
|
13
|
96
|
253
|
37.9%
|
15.98
|
24.46
|
0.65
|
14.41
|
13.73
|
1.05
|
| Shortspine
|
103
|
511
|
27
|
94
|
313
|
30.0%
|
17.39
|
26.19
|
0.66
|
14.25
|
11.91
|
1.20
|
| Thornyheads
|
29
|
81
|
81
|
0
|
0
|
|
10.29
|
0.00
|
|
|
|
|
| Canary rk
|
56
|
111
|
5
|
12
|
23
|
52.2%
|
14.95
|
8.70
|
1.72
|
8.05
|
8.47
|
0.95
|
| Pac oc perch
|
52
|
146
|
1
|
2
|
75
|
2.7%
|
2.30
|
2.96
|
0.78
|
2.00
|
1.84
|
1.09
|
| Widow rk
|
58
|
147
|
2
|
6
|
25
|
24.0%
|
6.41
|
9.08
|
0.71
|
5.33
|
3.82
|
1.40
|
| Yellowtail rk
|
56
|
193
|
7
|
22
|
52
|
42.3%
|
28.30
|
38.25
|
0.74
|
26.65
|
32.41
|
0.82
|
| All Sebastes
|
109
|
607
|
32
|
188
|
481
|
39.1%
|
156.58
|
157.80
|
0.99
|
114.46
|
126.14
|
0.91
|
| English sole
|
83
|
198
|
1
|
4
|
142
|
2.8%
|
0.17
|
2.05
|
0.08
|
0.16
|
0.10
|
1.62
|
| Petrale sole
|
93
|
230
|
4
|
3
|
97
|
3.1%
|
0.25
|
1.20
|
0.21
|
0.01
|
0.05
|
0.28
|
| Rex sole
|
96
|
441
|
7
|
42
|
406
|
10.3%
|
9.26
|
28.52
|
0.32
|
7.17
|
6.41
|
1.12
|
| Sanddab
|
35
|
97
|
2
|
10
|
94
|
10.6%
|
9.98
|
17.97
|
0.56
|
8.38
|
13.97
|
0.60
|
| Lingcod
|
82
|
231
|
3
|
16
|
101
|
15.8%
|
1.66
|
3.52
|
0.47
|
1.49
|
2.05
|
0.73
|
| Pac hake
|
108
|
614
|
41
|
309
|
573
|
53.9%
|
180.19
|
182.83
|
0.99
|
129.44
|
151.29
|
0.86
|
| Shark
|
109
|
541
|
33
|
104
|
508
|
20.5%
|
140.23
|
85.03
|
1.65
|
54.45
|
70.75
|
0.77
|
| Skate
|
113
|
625
|
31
|
177
|
558
|
31.7%
|
22.41
|
46.96
|
0.48
|
19.00
|
29.17
|
0.65
|
| UnID flatfish
|
20
|
54
|
43
|
4
|
11
|
36.4%
|
8.72
|
0.07
|
121.28
|
0.53
|
0.04
|
12.59
|
| UnID rockfish
|
30
|
100
|
100
|
0
|
0
|
|
44.35
|
0.00
|
|
|
|
|
| UnID fish
|
82
|
306
|
209
|
31
|
97
|
32.0%
|
56.62
|
278.53
|
0.20
|
14.53
|
49.43
|
0.29
|