Table 3.
Time-series regression result for trends and shifts in HHI after implementation of catch shares
| Fishery | Intercept | Trend | Post-CS intercept shift | Post-CS trend shift | Wald test F 3 y post-CS | Change in predicted HHI 3 years post-CS, % |
| Alaska halibut and sablefish | ||||||
| Active pre and post | 8.342*** | −0.0027 | −0.0681*** | 0.0286*** | 101.89*** | 17 |
| Exited | 8.629*** | 0.0261*** | 0.0885*** | −0.0048 | 9.03*** | 5 |
| Alaska AFA pollock | ||||||
| Catcher vessels | 8.502*** | −0.0001 | 0.1814*** | 0.0040 | 52.23*** | 27 |
| Catcher/processors | 8.932*** | −0.0022 | 0.1563 | −0.0014 | 2.98* | 15 |
| Alaska BSAI crab | ||||||
| Active pre and post | 8.528*** | −0.0155*** | −0.0501 | 0.0226*** | 60.74*** | 28 |
| Exited | 8.463*** | 0.0079 | 0.4920*** | −0.0147* | 12.91*** | 35 |
| Alaska BSAI nonpollock (Amendment 80) | 8.236*** | −0.0027 | 0.3917*** | −0.0194 | 5.95** | 22 |
| Central Gulf of Alaska rockfish | ||||||
| Active catcher vessels | 8.103*** | −0.0025 | −0.4683*** | 0.0422** | 0.00 | 0 |
| Exited catcher vessels | 8.264*** | 0.0468** | 0.2944 | −0.0386 | 1.16 | −12 |
| Active catcher/processors | 8.494*** | −0.0737** | −0.1552 | 0.0626 | 29.64*** | 70 |
| Exited catcher/processors | 8.385*** | −0.0172 | 0.4185 | −0.0167 | 4.92 | 26 |
| Pacific groundfish trawl | ||||||
| Active pre and post | 8.407*** | −0.0024 | 0.0040 | 0.0093 | 4.16** | 10 |
| Exited | 8.597*** | 0.0185*** | 0.2798** | −0.0282* | — | 0 |
| Pacific at-sea whiting | ||||||
| Active pre and post | 8.535*** | −0.0002 | 0.0033 | 0.0162 | 5.70** | 18 |
| Exited | 8.391*** | 0.0046 | −0.2090 | 0.0366 | 3.87* | 17 |
| Pacific shoreside whiting | ||||||
| Active pre and post | 8.229*** | −0.0059 | −0.2394** | 0.0466*** | 10.59*** | 25 |
| Exited | 8.488*** | 0.0085 | 0.2580* | −0.0237 | 0.19 | 2 |
| Pacific fixed gear sablefish | ||||||
| Active pre and post | 8.491*** | −0.0035 | −0.2692*** | 0.0299*** | 2.59 | 6 |
| Exited | 8.553*** | 0.0076 | 0.1134 | 0.0026 | 8.24*** | 15 |
| Northeast groundfish | ||||||
| Active pre and post | 8.676*** | 0.0047*** | −0.0955 | 0.0028 | 6.29** | −5 |
| Exited | 8.688*** | 0.0098*** | 0.0268 | 0.0013 | 1.46 | 5 |
| Northeast general category scallop | ||||||
| Active pre and post | 8.631*** | 0.0134*** | 0.0533 | −0.0050 | 1.31 | −3 |
| Exited | 8.719*** | 0.0085 | 0.0002 | 0.0043 | 1.59 | 8 |
| Mid-Atlantic tilefish | ||||||
| All | 8.895*** | 0.0110 | 0.0261 | −0.0064 | 0.13 | − |
| Gulf of Mexico red snapper | ||||||
| Active pre and post | 8.448*** | −0.0060 | −0.1234* | 0.0217*** | 24.26*** | 12 |
| Exited | 8.517*** | 0.0001 | −0.3151** | 0.0509*** | 23.41*** | 28 |
| Gulf of Mexico grouper and tilefish | ||||||
| Active pre and post | 8.798*** | 0.0017 | −0.2402*** | 0.0085* | 26.88*** | −8 |
| Exited | 8.704*** | 0.0180*** | 0.1980 | −0.0073 | 3.35 * | 6 |
CS, catch share. *10% significance level; **5% significance level; ***1% significance level.