This study was conducted on April 2016 in Mompang Julu Village Penyabungan Utara Subdistrict, Mandailing Natal Regency. The puspose of this study was to know investment cost, gross income, nett income, feasibility and prospect of enlargement cultivation of carp in pond on the future. This study used a survey method. The population in this study is the fish farmers. The respondent determined by …