The blue mackerel, also called Japanese mackerel, Pacific mackerel, slimy mackerel or spotted chub mackerel, is a fish of the family Scombridae, found in tropical and subtropical waters of the Pacific Ocean from Japan south to Australia and New Zealand, in the eastern Pacific, and the Indo-West Pacific: the Red Sea, the Persian Gulf, the Gulf of Oman and the Gulf of Aden, in surface waters down to 200 m. Wikipedia