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Table 2

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%)
Statistical effects
  Year Y 15 1991–2015 Yes
  Month M 7 June–December No
  Sub-regions A 4 Refer to Figure 1 Yes
Fishing effects
  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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