This study aims to analyze the factors that influence the export supply of fresh, frozen, filled and canned tuna products in Indonesia. The form of the bid response is the Nerlove model and the estimation technique used is the Seemingly Unrelated Regression Equation using the Shazam application. This study used time series data for 96 months from January 2012 to December 2019. The results of estimates showed that the number of tuna exports the previous month, the international price of tuna, the international price of type-i tuna substitution commodities, and national prices had a real influence on tuna exports in Indonesia. The four types of tuna products are very responsive to the international price of tuna, the international price of commodity substitution and national prices. The elasticity of supply in the short and long term is inelastic.