Fig. 4. (A) Classification tree for port groups, and GAM plots for (B) month, (C) depth, and (D) mesh size. The zero value on the GAM plot y-axes represents an average bycatch rate. Areas above this line represent above average bycatch rates, while areas below zero on the y-axes represent below average bycatch rates. For the classification tree, bycatch rates are shown per haul. For depth and mesh GAM plots, the y-axes have been reduced to better show the trends. As a result, the complete standard error range (dotted lines) for the smaller values on the x-axes is not shown. Outliers have also been removed in the depth and mesh plots (deeper than 375 m and mesh larger than 14 inches) to better illustrate trends for the majority of the data.