Marinated fish: Fish were filleted and washed. Fillets were dipped in 3% acetic acid ⁄10% salt marinating solution at a ratio of 1:1.5 (w⁄ w) for 24 h at 4 C. After marination, the fish were drained at ambient temperature (18 ± 1 C) for 15 min and placed into glass jars of 400 mL capacity with 125 mL sunflower oil.