Shrimp scad

The shrimp scad is one of five species of fish in the scad genus Alepes, which itself is one of thirty genera in the jack family Carangidae. The Carangidae are part of the order Carangiformes.{{cite book |title=Fishes of the World |edition=5th |author1=J. S. Nelson |author2=T. C. Grande |author3=M. V. H. Wilson |year=2016 |pages=380–387 |publisher=Wiley |isbn= 978-1-118-34233-6 |url=https://sites.google.com/site/fotw5th/ }}

A molecular phylogenetic study has confirmed the genus Alepes is supported, at least between A. djedaba and A. kleinii which are closely related.{{cite journal | last = Zhu | first = Shi-Hua |author2=Zheng, Wen-Juan |author3=Zou, Ji-Xing |author4=Yang, Ying-Chun |author5=Shen, Xi-Quan | title = Molecular phylogenetic relationship of Carangidae based on the sequences of complete mitochondrial cytochrome b gene | journal = Acta Zoologica Sinica | volume = 53 | issue = 4 | pages = 641–650 | year = 2007 | url = http://www.actazool.org/paperdetail.asp?id=6630 | access-date =2007-11-14}}

The shrimp scad was first scientifically described by Swedish naturalist Peter Forsskål from a specimen collected in the Red Sea in 1775, which was designated to be the holotype. He named the species Scomber djedaba, placing it in the mackerel genus, a common practice with carangids at the time, as the family Carangidae was yet to be erected.{{cite journal | last = Lin | first = Pai-Lei |author2=Shao, Kwang-Tsao | title = A review of the carangid fishes (family Carangidae) from Taiwan with descriptions of four new records | journal = Zoological Studies | volume = 38 | issue = 1 | pages = 33–68 | url = http://cat.inist.fr/?aModele=afficheN&cpsidt=10055944 | date = 2 April 1999 }} A number of taxonomists have since tried to reclassify the species in a more parsimonious genus, with a number of carangid genera proposed including Selar, Caranx and Atule.{{cite book |editor-last=Carpenter |editor-first=Kent E. |editor2=Volker H. Niem | title = FAO species identification guide for fishery purposes. The living marine resources of the Western Central Pacific. Volume 5. Bony fishes part 3 (Menidae to Pomacentridae) | publisher = FAO | year = 2001 | location = Rome | pages = 2684 | url = ftp://ftp.fao.org/docrep/fao/009/y4160e/y4160e00.pdf | isbn = 92-5-104587-9 }} To add to the confusion over the species, the species was redescribed twice after the first naming, once by Cuvier who named it Caranx kalla, and once by Fowler who proposed Caranx microbrachium for the species. Caranx kalla was subsequently placed in the genus Atule, but is now considered, along with Caranx microbrachium to be a junior synonym, unacceptable under the ICZN rules and has been discarded.{{FishBase | genus = Alepes | species = djedaba | year = 2007 | month = November}} The currently accepted name of Alepes djedaba was proposed by Gushiken in an extensive review of the carangidae of Japan, identifying a number of morphological features associating it with Alepes.{{cite journal | last = Gushiken | first = S. | title = Revision of the carangid fishes of Japan | journal = Galaxea, Publications of the Sesoko Marine Sciences Center of the University of Ryukyus | volume = 2 | pages = 135–264 | year = 1983 }} Due to the awkward species name, the species is often misspelt as djeddaba in the literature.

File:Shrimp scad.pngThe shrimp scad is can grow to a large size compared to other scads, reaching a maximum known length of 40 cm, but more often seen around 25 cm. The shrimp scad has a body profile very similar to other scads and some other carangids, with an oblong, compressed body and dorsal and ventral profiles which are almost evenly convex. The snout is pointed and the eye diameter is nearly equal to the snout length, with an adipose eyelid well developed on the posterior half of eye.{{cite journal | last = Iwatsuki | first = Yukio |author2=Seishi Kimura | title = First record of the carangid fish, Alepes djedaba (Forsskal) from Japanese waters | journal = Ichthyological Research | volume = 43 | issue = 2 | pages = 182–185 | year = 1996 | doi = 10.1007/BF02348244 | bibcode = 1996IchtR..43..182I }} There are two moderately high, separate dorsal fins, the first of which has eight spines, while the second has a single spine followed by 23 to 25 soft rays. The anal fin has two detached spines followed by one spine connected to 18 to 20 soft rays. The anterior section of the lateral line is strongly curved, containing thirty one to thirty six scales, while the straight section consists of seventy seven to eighty five scutes.

The colour of the body is an overall silver colour, with a green-blue tone on the upper body, while the underside fades to a more white colour. There is a diffuse dusky blotch on margin of operculum which is bordered by a smaller white spot. The spinous dorsal fin, including the last dorsal fin spine is blackish or dusky, the soft dorsal fin is blackish or dusky above the scaly sheath and the margin of first to fourth upper soft rays is whitish. The middle portion of the anal fin below the scaly sheath is slightly blackish or dusk. The caudal fin is often a striking yellow, especially when fresh, with the upper caudal lobe often fading to a darker shade. The posterior scutes may also be a yellow to rusty colour, especially after removal from the water.

The Shrimp scad is present in the Indo-Pacific region from the Red Sea and east Africa to the Hawaiian Islands, north to Japan and south to Australia. Observed in the Mediterranean Sea since it was recorded first off Palestine in 1927 as Caranx calla, it later extended to the Aegean Sea, Egypt, Libya and Tunisia.Atlas of Exotic Fishes in the Mediterranean Sea (Alepes djedaba). 2nd Edition. 2021. 366p. CIESM Publishers, Paris, Monaco.https://ciesm.org/atlas/fishes_2nd_edition/Alepes_djedaba.pdf{{cite journal | last = Taskavak | first = Ertan |author2=Bilecenoglu, Murat | title = Length–weight relationships for 18 Lessepsian (Red Sea) immigrant fish species from the eastern Mediterranean coast of Turkey | journal = Journal of the Marine Biological Association of the United Kingdom | volume = 81 | issue = 5 | pages = 895–896| doi = 10.1017/S0025315401004805 | year = 2001 | bibcode = 2001JMBUK..81..895T }} It is also recorded in the Marmara Sea.{{cite journal | last = Artüz | first = M. Levent |author2=Kubanç, S. Nerdin | title = First record of shrimp scad Alepes djedaba (Carangidae) from the Sea of Marmara, Turkey | journal = Cybium | volume = 38 | issue = 4 | pages = 319–320 | publisher = Société Française d’Ichtyologie }} The species is primarily an inshore inhabitant of reefs and over open sand patches, even in moderately turbid waters,{{cite journal | last = Blaber | first = S.J.M. |author2=Blaber, T.G. | title = Factors affecting the distribution of juvenile estuarine and inshore fish | journal = Journal of Fish Biology | volume = 17 | issue = 2 | pages = 143–162 | year = 1980 | doi = 10.1111/j.1095-8649.1980.tb02749.x | bibcode = 1980JFBio..17..143B }} often forming large schools. The species has in isolated circumstances also been found close to shore in surf zones in Japan{{cite journal | last = Nakane | first = Y. |author2=Suda, Y. |author3=Ohtomi, J. |author4=Hayakawa, Y. |author5=Murai, T. | title = Nearshore ichthyofauna in the intermediate sandy beach, Fukiagehama Beach, Kagoshima Prefecture, Japan | journal = Journal of National Fisheries University | volume = 53 | issue = 2 | pages = 57–70 | year = 2005 }} and in estuarine waters in South Africa.{{cite journal | last = Blaber | first = S.J.M. |author2=D.P. Cyrus | title = The biology of Carangidae (Teleostei) in Natal estuaries | journal = Journal of Fish Biology | pages = 173–188 | volume = 22 | issue = 2 | year = 1983 | doi = 10.1111/j.1095-8649.1983.tb04738.x | bibcode = 1983JFBio..22..173B }} The species is occasionally found in offshore environments, suggesting it can lead a pelagic lifestyle also.{{cite journal | last = Ching-Long | first = Lin |author2=Ho, Ju-shey | title = Sea lice (Copepoda, Caligidae) parasitic on pelagic fishes of Taiwan | journal = Journal of the Fisheries Society of Taiwan | volume = 28 | issue = 2 | pages = 119–142 | year = 2001 }}

The shrimp scad is known to be a migratory species, with records from India indicating the fish resides and feeds in the waters of Madras from September to May, before migrating elsewhere to spawn.{{cite journal | last = Kuthalingam | first = M.D.K. | title = The Food of Horse-Mackerel Caranx | journal = Current Science | volume = 24 | issue = 12 | pages = 416 | year = 1955 | url = http://www.ias.ac.in/j_archive/currsci/24/12/416/viewpage.html | access-date =2009-05-22 }} The shrimp scad feeds on a variety of prey, with at least two shifts in diet occurring as the fish mature. Older individuals feed mainly on young fishes, crustaceans like decapods, ostracods, amphipods and cladocerans with minor amounts of nematodes, insect body parts and insect larvae taken. Fish within a length range of 150–199 mm and 240–319 mm showed a preference for young fishes, while those in the length range of 200–239 mm primarily consumed ostracods and other crustaceans. Based on the food items taken, the species is an active midwater feeder. There is less food consumed during breeding season, which is indicative of reduced feeding activity during that period.{{cite journal | last = Sivakami | first = S | title = Observations on some aspects of biology of Alepes djedaba (Forsskal) from Cochin | journal = Journal of the Marine Biological Association of India | volume = 32 | issue = 1–2 | pages = 107–118 | year = 1990 }} Sexual maturity is attained by about 17 cm fork length and spawning is thought to occur in shallow coastal waters.{{cite book | last = Van der Elst | first = Rudy |author2=Peter Borchert | title = A Guide to the Common Sea Fishes of Southern Africa | publisher = New Holland Publishers | year = 1988 | pages = 132 | isbn = 1-86825-394-5 }}

The species is of moderate commercial interest in most countries where it is often considered too small to be worthwhile and is often caught on hook and line tackle and in seines as bycatch.{{cite journal | last = Bariche | first = M. |author2=N. Alwana |author3=M. El-Fadel | title = Structure and biological characteristics of purse seine landings off the Lebanese coast (eastern Mediterranean) | journal = Fisheries Research | volume = 82 | issue = 1–3 | pages = 246–252 | year = 2006 | doi = 10.1016/j.fishres.2006.05.018 | bibcode = 2006FishR..82..246B }} In Indian fisheries, the shrimp scad accounts for 43% of the carangid catch in purse seines, however is rarely taken by trawls or gill nets.{{Citation | first = H. | last = Mohamad Kasim | title = Carangids| place = Cochin | publisher = CMFRI| series = Status of Exploited Marine Fishery Resources of India| editor = Mohan Joseph, M. |editor2=Jayaprakash, A.A.| year = 2003| pages = 166–175 | isbn = 81-901219-3-6 }} It is also often taken by subsistence fisheries using various traditional gear such as inter-tidal fixed stake traps.{{cite journal | last = Al-Baz | first = Ali |author2=W. Chena |author3=J.M. Bishopa |author4=M. Al-Husainia |author5=S.A. Al-Ayoub | title = On fishing selectivity of hadrah (fixed stake trap) in the coastal waters of Kuwait | journal = Fisheries Research | volume = 84 | issue = 2 | pages = 202–209 | year = 2007 | doi = 10.1016/j.fishres.2006.10.022 | bibcode = 2007FishR..84..202A }} Around the Asian and Indonesian coasts, larger numbers are taken than anywhere else in its range and it is considered a good eating fish.

Fishery: Trade; Game: Fishing

{{Reflist|2}}

• [http://www.fishbase.org/summary/Speciessummary.php?id=1889 Shrimp scad at Fishbase]

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Category:Alepes

Category:Fish of the Pacific Ocean

Category:Fish of the Red Sea

Category:Fish described in 1775

Category:Taxa named by Peter Forsskål