The aim of this research was to know the effect of catfish wastewater and fish flour to the growth of lettuce plant in hydroponics. The research was conducted at the Hydroponics House in the Faculty of Agriculture, Sriwijaya University, from December 2020 to February 2021. This study used a Completely Randomized Design (CRD) consisting of 7 treatments, A1 = catfish wastewater 100%, A2 = catfish…