The research was conducted in January 2020, in Haranggaol Village, Haranggaol Horison Sub-District, Simalungun Regency. The purpose of this study was to determine the production of Goldfish, Tilapia, and Catfish cultivated in KJA and to analyze the factors that affect business productivity in KJA. Research method is Survey, with quantitative analysis and Cobb Douglas were used to analyze t…