About This Fish

Spotted Mackerel

The spotted mackerel (Scomberomorus munroi) is a ray finned fish in the family Scombridae under order Perciformes of class Actinoperygii. It also known as Australian spotted mackerel, Spotty Mackerel and Spotty. It is found in the western Pacific along the northern coast of Australia from the Abrolhos Islands region of Western Australia to Coffs Harbour and Kempsey in central New South Wales. The spotted Mackerel is pelagic oceanodromous species and it is found more commonly in offshore, open waters away from reefs and shoals.

The spotted Mackerel has an elongated body with pointed nose. It has a light silvery grey body that is blue green above the lateral line. Body is covered with small scales. 20 or more circular or oblong spots are present on the sides above and below the lateral line which is larger than pupil but smaller than eye diameter. The inner surface of the pectoral fin is dark blue and light above while the cheeks and belly are silvery white. Eight or nine finlets are present on each side of caudal peduncle. The anal fin and anal finlets are light silvery gray and the dorsal fin is uniformly black, bright steely blue. Single lateral line is present which is gradually curved down toward caudal peduncle. It has two dorsal fins which are separated by a small notch. The rays of the first dorsal fin project beyond the membrane. The second dorsal fin is triangular and emarginated behind. Dorsal fin has 20-22 spines and 17-20 soft rays while anal fin contains 17-19 soft rays. Anal fin is positioned just opposite to the second dorsal fin while pectoral fin is situated edge of the gill cover. The spotted Mackerel feeds almost exclusively on pelagic species such as anchovies, pilchards, herring and sardines with smaller quantities of shrimps and squids. The female and male Spotted Mackerel reach sexual maturity at about 60 cm and 52 cm in length respectively at about 1–2 years of age. Spawning occurs in offshore waters from late winter to early spring. It grows up to 104 cm in length and 10.2 kg in weight. It can live up to 7 years.

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