Disease that often attacks catfish is Motile Aeromonas Septicemia (MAS) caused by Aeromonas hydrophila bacteria. The use of antibiotics to treat fish can cause residues in the fish's body so that natural ingredients are needed as an alternative, namely nipa leaves (Nypa fruticans Wurmb). The purpose of this study was determine the optimal dose of nipa leaves meal in feed to prevent MAS disease.…