Explanatory variables included in the Gamma-GLM model tested in deviance reduction for selection.
|Standardizing variable||Model parameter||Category levels||Category definitions||Model deviance reduction (greater than 1%)|
|Sub-regions||A||4||Refer to Figure 1||Yes|
|Vessel power||P||Continuous||From 40 to 818 KW||Yes|
|11||Truncated each 50 KW||Yes (higher than continuous)|
|Vessel length||L||Continuous||From 5 to 35 m||No|
|9||=<15 m; 16–29 m; >= 30 m||Yes (higher than Power)|
|Mesh size||MS||Continuous||from 45 to 300 mm||No|
|5||Truncated each 20 mm : =<60 mm; 80 mm; 100 mm; 120 mm; >=140 mm||No|
|Oceanographic and environmental effects|
|Ocean depth||D||Continuous||from 0 to 5000 m||No|
|10||from 0 to 5000 m at each 500 m.||Yes|
|Sea surface temperature||SST||Continuous||from 11 to 25°C||Yes|
|12||=<12; 13 to 22; >=23°C||Yes (higher than continuous)|
|Sea floor gradient||SFG||Continuous||from 0 to 362||No|
|8||Truncated each 40 m||No|
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