The blue mackerel, Japanese mackerel, Pacific mackerel, slimy mackerel, or spotted chub mackerel, Scomber australasicus, a fish of the family Scombridae, is found in tropical and subtropical waters of the Pacific Ocean from Japan south to Australia and New Zealand, in Eastern Pacific (Hawaii and Socorro Island (Mexico), also in 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 (660 ft). Its length is between 30 and 65 cm (12 and 25 in), and weight over a kilogram (2 lbs). Although at times flighty and difficult to catch particularly when in estuaries and harbours, the Blue mackerel is known as a voracious and indiscriminate feeder. When schooled and in a feeding frenzy, they will strike at non-food items such as cigarette butts and even bare hooks. While relatively small in size, pound for pound mackerel score high for their fighting ability.