Econ Papers Daily / 期刊论文
珍宝蟹渔业中去内脏令的价格影响
Price Impacts of Evisceration Orders in the Dungeness Crab Fishery
摘要
The Dungeness crab fishery textemdash the most economically valuable on the U.S. West Coast textemdash has faced repeated, climate-driven disruptions over the past decade due to harmful algal blooms (HABs). These blooms, fueled by warming ocean temperatures, lead crabs to ingest toxin-producing algae, making them unsafe for human consumption. In response, fisheries managers have traditionally shut down the fishery, triggering substantial economic losses. To reduce these losses, some West Coast states have turned to evisceration orders, which allow crabs to be harvested during HABs if their toxin-containing intestines are removed before sale. However, the economic viability of this strategy depends on how it affects ex-vessel prices, i.e., the prices harvesters receive at the dock. This study quantifies the impact of evisceration orders on ex-vessel prices in Washington’s non-tribal fishery using quasi-experimental data from a 2021 HAB event. Employing both a difference-in-differences approach and structural demand estimation, we find that evisceration orders led to a decline in ex-vessel prices ranging between 26.5-33.5%. These results reveal a significant economic trade-off: while evisceration orders may preserve fishing opportunities during HABs, they also substantially erode market value. Our findings offer critical insights for designing adaptive fishery management strategies that protect public health while supporting industry resilience in an era of accelerating ocean change.
中文摘要
邓杰内斯蟹渔业——美国西海岸经济价值最高的渔业——在过去十年中，因有害藻华（HABs）而反复面临气候驱动的中断。这些藻华由海洋变暖所驱动，导致蟹类摄入产毒藻类，从而使其不适宜人类食用。作为应对，渔业管理者传统上会关闭该渔业，造成重大经济损失。为减少这些损失，部分西海岸州已转向采用去内脏令，该措施允许在有害藻华期间继续捕捞蟹类，前提是在销售前去除其含毒素的内脏。然而，这一策略的经济可行性取决于其如何影响码头交货价格，即捕捞者在码头获得的价格。本研究利用2021年一次有害藻华事件的准实验数据，量化了去内脏令对华盛顿州非部落渔业码头交货价格的影响。我们同时采用双重差分方法和结构性需求估计，发现去内脏令导致码头交货价格下降26.5%至33.5%。这些结果揭示了一个重要的经济权衡：虽然去内脏令可能在有害藻华期间保留捕捞机会，但也会大幅侵蚀市场价值。我们的研究结果为设计适应性渔业管理策略提供了关键见解，以在海洋变化加速的时代保护公众健康，同时支持产业韧性。