Table 1.

Fishery-specific analyses of ITQ benefits. Each fishery is treated as a time series of collapse, with some fisheries converting to ITQ during the interval. Propensity score matching (25) controls for the effects of LME, genus, or species to further isolate biases that may arise from the particular places and fisheries where ITQs have been implemented. Columns 2 to 5 provide regression model results for four different propensity score models. Rows 2 and 3 provide the regression coefficients and SEs (in parentheses). Fisheries without ITQ management had an average annual percentage change of 0.54. For all comparisons, the annual benefit of ITQs roughly counters the current rate of decline in other fisheries (23). All estimated coefficients are statistically significant at the 1% level.

Parameter used to match fisheriesNoneLMEGenusSpecies
Percent ITQ difference (SE) -7.06 -7.41 -6.79 -6.87
(0.49) (0.428) (0.443) (0.441)
Annual percent ITQ effect (SE) -0.49 -0.37 -0.54 -0.51
(0.136) (0.137) (0.136) (0.139)