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Trachurus japonicus:   

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Synonyms
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  • Caranx trachurus japonicus  Temminck & Schlegel, 1844: 109 (original description).
  •  
  • Trachurus argenteus  Wakiya, 1924: 145.
    FAO Names
    En - Japanese jack mackerel, Fr - Chinchard du Japon, Sp - Jurel japonés.
    3Alpha Code: JJM     Taxonomic Code: 1702300403
    Diagnostic Features
    Body elongate, fairly compressed. Head large; posterior end of upper jaw extending posteriorly to below anterior margin of eye; lower jaw projected. Adipose eyelid well developed. Small nostrils closely situated each other, anterior nostril oval and posterior nostril crescent. A distinct notch on posterior margin of opercle. Dorsal accessory lateral line terminating below origin second part of dorsal fin.  Gillrakers, including rudiments, 36-42 on lower limb of first gill arch. Interorbital region slightly arched, its width usually slightly larger than eye diameter.  Dorsal fin with 8 spines and I + 31. Anal fin with I + 29 preceded by 2 strong spines. Pelvic fin falcate; its posterior end beyond origin of second part of dorsal fin.  Scales in curved lateral line 29-37, expanded dorsolaterally and scute-like; in straight lateral line 33-41 scutes; total scales and scutes 67-74.  Colour body grayish blue dorsally, silvery white ventrally; a black blotch on opercular margin; dorsal and pectoral fins dusky; pelvic and anal fins pale; caudal fin yellow. 
    Geographical Distribution

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    Western North Pacific. Common in Japanese waters except for Okinawa Island.
    Habitat and Biology
    Benthopelagic species; usually over sandy bottomin 50-275 m; also pelagic and near surface at times.Feeding primarily on crustaceans (copepods), shrimps, but also small fishes.
    Size
    To about 23 cm; common 13-17 cm.
    Interest to Fisheries
    Interest to Fisheries Caught commercially with trawls, purse seines, traps and on line gear. Marketed fresh. The total catch reported for this species to FAO for 1999 was 227 230 t. The countries with the largest catches were Japan (211 107 t) and Korea, Republic of (13 552 t).
    Utilized canned for human consumption and also made into fishmeal.
    Local Names
    English : Jack mackerel ,  Japanese scad .
    Japanese : Maaji .
    Polish : Ostrobok japonski .
    Remarks
    This species is similar to Trachurus novaezelandiae known from New Zealand and Australia, but differs by larger eyes and number of gillrakers.
    Bibliography
    Ben Salem, M. - 1988 Taxinomie numérique des espèces du genre Trachurus
    Froese, R. and D. Pauly. Editors. 2003. FishBase. World Wide Web electronic publication. www.fishbase.org
    Matsuura, K. - 1985 Carangidae. In: O. Okamura; T. Kitajima (eds.). Fishes of the Okinawa through and the adjacent waters. Japan Fisheries Resorce Conservation Association, Vol. II:492, 680.
    Rafinesque, 1810 (Poissons, Téléostéens, Carangidae). Cybium, 12 (1): 45-58.
     
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