Box plots of revenue/expenditure ratio of each fishing operation. LL: longlining; GN: drift gillnetting; RN: ring netting; RN+GN: combination of gillnetting and ring netting; and RN+LL: combination of longlining and ring netting. lower limits of boxes: first quartile; horizontal lines: medians; upper limits of boxes: third quartile; whiskers: minimum and maximum; dots: outliers. The boxes with similar letters were not significantly different.