Scomber scombrus (Mackerel)  

Atlantic mackerel is a pelagic species that makes extensive migrations, and there are a variety of hydrographical features such as temperatures as well as the abundance and composition of zooplankton and other prey is likely to affect its distribution. Scomber scombrus can be extremely common and found in huge shoals feeding on small fish and prawns.

Additional Information
Marine Life Information Network Fact File