It's an air bladder but is if not similar to the widespread mackerel. The Pacific chub mackerel is caught in sizeable figures from the Coastline of California, whilst the Atlantic chub mackerel is broadly distributed along equally coasts with the North and South Atlantic. Disclaimer: A lot of the links https://wherecanibuytinyfrozenshr14577.smblogsites.com/31751576/top-atlantic-mackerel-range-secrets