The changes in moisture, protein, fat and ash contents of fish fillets after different cooking processes are shown in Table 1. The moisture content of the fish fillets varied from 66% to 72%, showing decrease after cooking. Raw fillets had the lowest protein content (21.52 mg/100 g), while fried fillets had the highest (25.88 mg/100 g). Raw fish fillets contained a higher level of moisture compared to cooked samples and fried fillets had the lowest rate of moisture between the cooked ones. The moisture contents of the fish samples were inversely related to the total lipid content. This may be attributed to the oil penetrating the food after water is evaporated during cooking (Marimuthu, Thilaga, Kathiresan, Xavier, & Mas, 2011). Generally, protein and ash contents increased after cooking in all the evaluated methods and increase in the protein content was only significant (P < 0.05). Ersoy and Özeren (2009) reported that the increase in protein, fat and ash contents could be explained by the reduction in moisture.