This research aims to determine the effect of giving different doses of guava leaf flour on increasing the production of common carp (Cyprinus carpio L), which are reared using a recirculation system. This research was conducted using a completely randomized design (CRD) with 5 treatments and 3 replications, namely control, 1%, 1.5%, 2%, and 2.5%. The size of the fish used was 3-5 g, kept in 10…