Decapterus macrosoma Bleeker, 1851
Shortfin scad
photo by Khalaf, M.A.

Family:  Carangidae (Jacks and pompanos), subfamily: Caranginae
Max. size:  35 cm TL (male/unsexed)
Environment:  reef-associated; depth range 20 - 214 m
Distribution:  Indo-Pacific and Southeast Atlantic: from Knysna to Natal, South Africa to Australia, including Persian Gulf and the Red Sea, and in the Central Pacific Islands from South Korea to Gulf of California to Peru, including Galapagos Islands (Ref. 9283). Distribution in south Western Australia, and South Australia is false.
Diagnosis:  Dorsal spines (total): 9-9; Dorsal soft rays (total): 33-38; Anal spines: 3-3; Anal soft rays: 27-30. Body slender, elongate, and somewhat circular in cross section; posterior end of upper jaw concave dorsally and with a rounded protrusion ventrally; edge of shoulder girdle (cleithrum) with two small papillae, the lower one larger; dorsal and anal fin each followed by a separate finlet (Ref. 55763). Color metallic blue dorsally, silvery ventrally; fins hyaline; opercle with a small black spot (Ref. 2334). 24-40 scutes. Very slender compared to similar species (Ref. 48635).
Biology:  A predominately pelagic schooling species (Ref. 9283, 48635, 58302). Occasionally seen in small groups along reef slopes adjacent to deep water in pursuit of zooplankton (Ref. 48635). Adults feed mainly on small invertebrates (Ref. 5213). Marketed fresh and salted or dried (Ref. 9283).
IUCN Red List Status: Least Concern (LC); Date assessed: 09 March 2015 Ref. (120744)
Threat to humans:  harmless
Country info:   

Entered by: Luna, Susan M. - 10.11.90
Modified by: Bailly, Nicolas - 12.07.13
Checked by: Capuli, Estelita Emily - 10.08.94

Source and more info: For personal, classroom, and other internal use only. Not for publication.

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