Antioxidants widely used in food industries are defined as any substance with the ability to delay or inhibit oxidation (Chalamaiah et al., 2012). Some synthetic antioxidants such as butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT) and propyl gallate are commonly added to prevent lipid oxidation (Umayaparvathi et al., 2014). Recently, the search for natural antioxidants is growing due to health hazards from synthetic antioxidants. Fish protein hydrolysates exhibiting antioxidant activity such as yellow stripe travelly (Klompong et al., 2007) and round scad (Thiansilakul et al., 2007) have been reported. However, no study has been conducted on the potential of GAS (Pomacea canaliculata) protein hydrolysate as an antioxidant.