The economic impact of the effects of the Turtle Excluder Devices (TEDs) used in the Gulf of Mexico to control the numbers of turtles caught in shrimp trawl nets is analyzed. This is a major concern to the shrimp fishing economy due to the potential loss of shrimp. A simulation modeling technique is used which estimates the changes in landings, revenues, costs, and the economic rents. A base scenario in which no TEDs are used is compared with five different scenarios where the TED is used by vessels in the Gulf of Mexico. The analysis was based on a single year impact. The implementation of the TED comes with costs to the vessel owners and crew in the Gulf of Mexico. Since the implementation of the TEDs does cause negative rent, it is a certainty, all other things remaining equal, that some vessel owners and crew will leave the industry. The number to leave the industry will depend on how effective they are at learning to use the TED effectively.