The ocean provides humanity with many services and goods, including clean air, minerals, and food. Sustainable use and management of our marine resources are important to ensure that these resources are available for future generations. The turn-based activity presented in this article teaches students the challenges of managing a sustainable fishery, including the difficult task of accurately estimating population sizes. It also shows students that finding a balance between the environment and economic gain is possible but takes cooperation and work. (Contains 1 figure.)