Mackerel is one of the highly recommended oily fish for a healthy diet. It is one of the easily available and sustainable fish around and also known as maccarello. It is rich in essential oils, vitamins and minerals. Omega-3 and Omega-6 fatty acids occur in high quantities in this fish. It contains vitamins A, B6, B12, C, D, E and K. Various minerals also occur richly in the fish.