Table 2.
Difference-in-differences estimation.
| (1) | (2) | (3) | (4) | (5) | (6) | |
|---|---|---|---|---|---|---|
| PRI expansion | 0.338*** | −0.357** | −0.591*** | |||
| (0.044) | (0.162) | (0.172) | ||||
| PMNM expansion | 0.945*** | −0.195 | −0.489 | |||
| (0.287) | (0.318) | (0.398) | ||||
| Hawaii-based Tuna Trips | 4.037*** | 4.169*** | 4.218*** | 1.236*** | 1.091*** | 1.980*** |
| (0.044) | (0.046) | (0.093) | (0.083) | (0.086) | (0.338) | |
| PRI * Hawaii | 0.745*** | 0.782*** | 0.564*** | |||
| (0.082) | (0.082) | (0.098) | ||||
| PMNM * Hawaii | 0.703** | 0.754** | 0.532 | |||
| (0.298) | (0.303) | (0.329) | ||||
| Month dummies | No | Yes | Yes | No | Yes | Yes |
| Year dummies | No | Yes | Yes | No | Yes | Yes |
| Vessel dummies | No | No | Yes | No | No | Yes |
| Additional controls | No | No | Yes | No | No | Yes |
| Observations | 33,444 | 33,444 | 33,444 | 34,964 | 34,964 | 34,964 |
| R2 | 0.160 | 0.177 | 0.222 | 0.022 | 0.043 | 0.092 |
Notes: The dependent variable in all columns is Catch of Bigeye and Yellowfin Tuna per 1000 Hooks. In Columns (1)–(3), the control group is Hawaii-based swordfish trips and the sample runs from January 1st 2010 to August 25th 2016. In Columns (4)–(6), the control group is American Samoa-based tuna trips and the sample runs from January 1, 2010 to December 31, 2017. Heteroskedasticity-robust standard errors presented in parentheses. The additional controls are whether the set included an experimental component, a dummy variable for whether the WCPFC waters were closed to fishing, a dummy variable for whether IATTC waters were closed to vessels longer than 24 m, Monthly El Niño indicator, Monthly El Niño indicator lagged by 1 year, Monthly El Niño indicator lagged by 2 years, and Monthly El Niño indicator lagged by 3 years. *p < 0.1; **p < 0.05; ***p < 0.01 for two-sided t test of statistical significance using heteroskedasticity-robust standard errors.