Iowa’s Dept of Natural Resources (IDNR) Rathbun Fish Culture Research Facility (RFCRF) has developed pilot scale recirculation aquaculture systems (RAS) for egg incubation, larviculture, and growout to produce 225 mm fingerlings for sport fish enhancement stocking. Few studies have evaluated RAS technology for Walleye production and more research was needed for IDNR to adapt fingerling production to RAS. The first RAS growout system was operational in 2015 with additional systems developed later for egg incubation (2018) and larviculture (2019). This presentation will summarize our modifications and advancements for successful adaptation of walleye culture to RAS.