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The objective of this study was to estimate input demand and output supply for catfish growth out. The study was conducted in Tulung Agung regency, East Java from August to December 2002. Data were analyzed statistically by profit function model, using Three-Stages Least Square estimation. The results of this study showed that the catfish price was elastic and responsive to the changes of catfish seed and feed prices, but inelastic to the changes of human labor. The catfish price had positivedoi:10.22146/jfs.9039 fatcat:shv3tu422ngtrijs3ksexa6hhm