Mackerel is one of the so-called oily fishes. It lives right across the North Atlantic but it is a seasonal fish in the sense that it can be found in shallow waters in the summer months and in deeper waters in the winter. Fish oils are high in Omega 3 fats. Omega 3 and Omega 6 are also known as essential fatty acids. These are the so-called good fats which are implicated in healthy brain and nerve development. Omega 3 has been proven to have a role in preventing heart disease and is thought to help treat bi-polar disorder and depression. More controversially an increase in essential fatty acids in the diet is considered by many to help children with behavioural problems to become calmer and more able to focus on educational tasks. There are also claims made about a possible positive impact on those suffering from dyslexia. It is currently recommended that people eat fish twice a week including at least one portion of oily fish such as mackerel.