African Queen Mackerel is a Ghanaian favourite. It is an excellent source of vitamin B-12. A serving provides 8.71g which means that you will get far more than the recommended daily allowance for adults. Mackerel also provides niacin, iron, vitamin B6, riboflavin, magnesium, phosphorus, folate, and selenium. Mackerels are considered to be some of the most nutritious fish. They’re an excellent source of protein, vitamins B2, B3, B6, and B12, and vitamin D. Their flesh is also full of minerals like copper, selenium, and iodine. Some of these fish also contain good amounts of iron and vitamin B1.