Illegal, Unreported, and Unregulated (IUU) fishing is a significant challenge to sustainable seafood production which is difficult to address in traditional governance systems. Recently, the U.S. has implemented a Seafood Import Monitoring Program (SIMP) to combat IUU fishing and seafood fraud by requiring chain-of-custody documentation of 13 species when imported to the U.S. This will exclude IUU seafood from the U.S. market. If the U.S. has market power due to large imports, it will also give exporters incentives to improve management to comply with the SIMP. However, if the U.S. has no market power, the effect of the SIMP will be a change in trade patterns and the costs associated with the SIMP will be carried by U.S. consumers in the form of higher prices and lower seafood consumption. In this paper, a residual supply approach is used to investigate whether the U.S. has buyer power for three species included in the SIMP: shrimp, crab, and tuna. The standard residual supply framework is augmented to account for exchange rates. The results indicate that the U.S. has buyer power for most products. Hence, the SIMP will give incentives to improve the management practices in the investigated supply chains.

非法，不报告和不管制捕鱼是可持续海产品生产的重大挑战，这在传统治理体系中很难解决。最近，美国实施了海鲜进口监控计划（SIMP），以打击IUU捕捞和海鲜欺诈，要求进口到美国的13种鱼的产销监管链文件。这将把IUU海鲜排除在美国市场之外。如果美国由于进口量大而具有市场支配力，它将也向出口商提供激励，以改善其管理以遵守SIMP。但是，如果美国没有市场力量，SIMP的影响将是贸易模式的改变，与SIMP相关的成本将由美国消费者以较高的价格和较低的海鲜消费量承担。在本文中，剩余供应量方法用于调查美国是否对包括在SIMP中的三种物种（虾，蟹和金枪鱼）具有购买力。标准剩余供应框架得到了扩展，可以考虑汇率。结果表明，美国对大多数产品都有购买力。因此，SIMP将激励改善被调查供应链中的管理实践。