CRD 06-19
Table 2. Variables examined in an analysis of factors affecting loggerhead sea
turtle bycatch in Mid-Atlantic otter trawl gear. Percentage of observed days
fished and VTR days fished are shown for categorical variables, as is the range
of values for continuous variables. |
Variable |
Definition |
% Observed Days Fished |
% VTR Days Fished |
| Latitude+ |
Latitude
34-34°59’N
Latitude 35-35°59’N
Latitude 36-36°59’N
Latitude 37-37°59’N
Latitude 38-38°59’N
Latitude 39-39°59’N
Latitude 40-40°59’N
Latitude 41-41°30’N |
0.1%
1.7%
4.1%
6.3%
12.5%
13.7%
23.9%
37.7% |
0.6%
2.2%
2.8%
4.6%
7.0%
13.9%
39.5%
29.4% |
| Latitude
Zone |
Lat3438: 34-38°59’N
Lat3941: 39-41°30’N |
24.7%
75.3% |
17.7%
82.3% |
| Excluder
Use |
Not
present or clogged: 0
Present and not
clogged: 1 |
98.0%
2.0% |
98.0%
2.0% |
| Depth |
Bottom
depth (m) |
2-383m |
2-822m |
| SST |
Sea
surface temperature (C) |
3.7-25.4°C |
2.2-27.6°C |
| Depth
Categorical+ |
Deep: ≥50m
Shallow: <50m |
59.9%
40.1% |
56.3%
43.7% |
| SST
categorical+ |
Hi: >18°C
Low: ≤18°C |
19.7%
80.3% |
24.6%
75.4% |
| Towspeed |
Towing
speed of vessel (kt) |
1.5-4.9kn |
Not
available |
| Head
Rope Length |
Length
of the trawl net head rope (m) |
11.5-88m |
Not
available |
| Gross
Tonnage |
Tonnage
of vessel |
5-372
tons |
2-372
tons |
| Mesh
Size |
Mesh
size of the cod end (inches) |
1 – 6.7
inches |
1-8.0
inches |
| Species |
Fish
species targeted on trip* |
Cod
(6.8%)
Haddock (7.1%)
Long-fin squid
(18.2%)
Mixed ground (9.7%)
Short-fin squid
(5.9%)
Summer flounder
(18.8%)
Winter flounder
(7.1%)
YT flounder (10.8%)
Croaker (0.6%)
Weakfish (0.5%)
Other species (14.5%) |
3.0%
2.6%
19.9%
2.2%
1.8%
16.4%
9.5%
8.5%
0.6%
0.5%
35.0% |
| + Latitude was not tested together with latitude zone.
Depth and SST categorical variables were not tested together with Depth and
SST continuous variables. *For VTR trips, “target” species defined
as the most amount of species caught on a trip. For observer trips, target
species defined as the species sought after on a trip. |