Cool-water fish culture for percid species like Walleye and Sauger comes with a unique set of challenges for each fish developmental stage. These challenges necessitate design solutions that are unique to the rearing of these species. One approach to addressing these challenges is to rear these species in Recirculating Aquaculture Systems (RAS). Increased survival (60-80%) and overall improvements in health have been achieved by rearing these species in RAS. Water quality management and tempering of the water supply are critical for all stages of life, from incubation to grow-out. Incubation and early rearing are complex due to fish behavior and a tendency towards cannibalism that requires a narrow range of environmental conditions to be maintained in RAS. These conditions include darkened rearing environments, controlled water turbidity, and use of spray bars at the tank water surface. In addition, treatment is needed for recirculated water, including the following unit processes: filtration for removing settleable and suspended solids, carbon dioxide stripping, oxygen addition, disinfection, and biofiltration if the system is recycling more than 75% of its water. Means for system reliability are critical, requiring equipment redundancy and monitoring and alarms for both the individual tanks and the systems. Additional design considerations for the culture of these fish species include evaluation of vertical vs. horizontal treatment equipment, use of modular systems, biosecurity measures, and incorporation of training and startup assistance. By taking into consideration the needs specific to percid species, RAS facilities can be designed for successful rearing of cool-water species for stock enhancement. Two current project examples with be reviewed for the design of new hatchery facilities for these fish species.