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Japanese Horse Mackerel

Trachurus japonicus (Temminck & Schlegel 1844)

Lifespan, longevity, and ageing

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Observations: Little is known about the longevity of these animals, but they have been known to live up to 6 years (http://www.fishbase.org/). Considering the longevity of similar species, however, maximum longevity could be significantly underestimated.
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Benefits

provided by FAO species catalogs
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.

Brief Summary

provided by FAO species catalogs
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

provided by FAO species catalogs
To about 23 cm; common 13-17 cm.

Distribution

provided by FAO species catalogs
Western North Pacific. Common in Japanese waters except for Okinawa Island.

Diagnostic Description

provided by FAO species catalogs
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.

References

  • Ben Salem, M. - 1988 Taxinomie numérique des espèces du genre Trachurus
  • 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.

Migration

provided by Fishbase
Oceanodromous. Migrating within oceans typically between spawning and different feeding areas, as tunas do. Migrations should be cyclical and predictable and cover more than 100 km.
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Morphology

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Dorsal spines (total): 9; Dorsal soft rays (total): 30 - 35; Analspines: 3; Analsoft rays: 26 - 30; Vertebrae: 24
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Trophic Strategy

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Inhabits coral reefs (Ref. 58534). Migrates to deeper waters with age (Ref. 125576).
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Diagnostic Description

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Species with no finlets and the entire lateral line with scutes (69-73) (Ref. 41299).
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Biology

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Adults occur on continental waters (Ref. 41299). Pelagic (Ref. 52947). Juveniles associate with drifting seaweed (Ref. 12114, 12115).
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Importance

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fisheries: highly commercial; aquaculture: commercial; price category: high; price reliability: reliable: based on ex-vessel price for this species
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分布

provided by The Fish Database of Taiwan
僅分布於台灣、中國大陸沿海、日本及朝鮮半島等西北太平洋區。台灣各地沿岸均可見其蹤跡,是常見之魚種。
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利用

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主要漁法以底拖網、一支釣、流刺網及定置網捕獲。油炸食之較宜。
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描述

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體呈亞圓筒形而稍側扁。吻尖。脂性眼瞼發達,前部達眼之前線,後部達瞳孔後緣附近,留下一個半圓的縫隙。上下頜各有一列細齒,鋤骨、腭骨及舌面皆具齒。胸部完全具鱗。側線由起點至第二背鰭起點下方幾乎呈直線,而後斜下至第二背鰭第7-9鰭條下方起至尾柄又成一直線;側線上全被稜鱗,稜鱗高而強,是本屬重要之特徵。背部另有一副側線,沿著背鰭的基底一直延伸至第二背鰭基部起點之下方。無離鰭。體背藍綠色或黃綠色,腹部銀白色。鰓蓋後緣上方具一黑斑。背鰭暗色,胸鰭淡色,其餘各鰭黃色。
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棲地

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分布區域突窄之魚種。群游於近沿岸水域,具有日夜垂直分布之習性。主要以小型甲殼類及魚類為食。
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Japanese jack mackerel

provided by wikipedia EN

The Japanese jack mackerel (Trachurus japonicus), also known as the Japanese horse mackerel or Japanese scad, is a species named after its resemblance to mackerel but which is in the family Carangidae, the jacks, pompanos, trevallies and scads.[3] Their maximum reported length is 50 cm (20 in) with a common length of 35 cm (14 in). They have a maximum reported weight of 0.66 kg (1.5 lb) and a maximum reported age of 12 years.[2] They are found around the coast of Japan, apart from Okinawa Island, usually on sandy bottoms of 50–275 m (164–902 ft) deep.[2] They feed mainly on small crustaceans such as copepods, and shrimps and small fish. They are similar to the yellowtail horse mackerel around New Zealand and Australia, apart from having more gill rakers and larger eyes.[4]

The Japanese name for the horse mackerel is aji (あじ), and by default generally implies the species Trachurus japonicus (which can be more specifically referred to as ma-aji (まあじ), literally "true aji"). The name is most commonly written in hiragana; although a kanji () does exist, it is not in common use. It is commonly deep fried ("aji furai" あじフライ) or salt-grilled ("shioyaki aji" 塩焼きあじ).

In Korean cuisine, the fish is dubbed jeon-gaeng-i (전갱이) and is the default horse mackerel designated by this name. It is commonly grilled or fried as a jeon-gaeng-i gui (전갱이 구이). Among the specialties of Jeju cuisine is the soup gagjaegi-gug (각재기국), the name of which is derived from the name for the fish in the Jeju language.

Description

The Japanese jack mackerel (Trachurus japonicus) is a small fish with an average length between 13 – 40 cm, and a maximum recorded size of 50 cm.[5] It is greyish blue on its back, while having a silver color on the underside of the fish with a black blotch the gills.[5] The dorsal and pectoral fins are a dusky color whereas the pelvic and anal fins are pale.[5] One of the main distinguishing features of the Japanese Jack Mackerel is its bright yellow caudal fin which stands out compared to the rest of the species’ coloration.[5] Its scales are common among other species in its family, being dense in a horizontal and coarse in a vertical direction with a bend in the midpoint of the scale to follow the curvature of the animal.[6] Scales on anterior half of the species have this curve, while those on the posterior half are straight, with any scales in between these two sections being pointed.[6] The spine of the species consists of 14 vertebrae connected to the dorsal fin, with another 10 vertebrae on the underside of the animal all with fine ridges lining them, common with other species in the family Trachurus.[6] The dorsal fin is split into two sections, the front set consisting of eight bony spines, and the rear set having one bony spine and another 25 – 27 soft rays, depending on the size of the individual.[6] All these fins are controlled by 3 muscles and many ligaments.[6] The caudal fin on the side of jack mackerel is a much more complex structure of about 12 cm with a series of 6 bones, more than 20 soft rays projecting outwards and 6 muscles controlling its movement.[6] The anal fin is made up of a collection of 3 spines with 26 – 30 soft rays coming from them.[2][6] The jaw of the Japanese Jack Mackerel has a projected lower section and is lined with 4 separate segments of small conical teeth with medially bent tips which become larger moving towards the back of the jaw.[6]

Distribution and habitat

The Japanese jack mackerel generally lives in and around the East China Sea and Sea of Japan, in tropical regions between the coordinates of 46°N – 13°N and 105°E – 148°E.[2][7] Although these are the main population grounds of the Japanese jack mackerel, they are also found in southern Japan, the Korean peninsula and in the Pacific Ocean off the coast of southeast Asia, primarily in Taiwan.[2][7] These locations vary depending on the temperature of the water primarily, and thus are varied with the seasons, with a higher density of Japanese Jack Mackerel in the southern and central china seas in the colder months.[7] The ideal condition for the species ranges between 15 – 26 °C, with an ideal temperature of around 21 °C.[8][9] With the temperature varying between the northern and southern areas of the East China Sea by around 3 – 5 °C, migration between these regions is a highly beneficial strategy for the species, especially during maturation [6]. There are many spawning grounds for the Japanese Jack Mackerel, all of which make use of the Kuroshio and Warm Tsushima Currents to migrate into the Japan or East China seas.[7][10][11] The primary spawning grounds are along the war coastal waters of Japan with a large portion being around the region of Kyushu and southern Japan.[10][11] The only other intensive spawning ground is the coastal waters of Taiwan, which also uses the Kuroshio current to move into the Eastern China and Japan seas.[7] The transport of the juveniles from this spawning ground can take up to 40 days, whereas those spawned in and around the Japan coastal waters can take up to 2 months to reach the Eastern China Sea.[7][11] The southern and central areas of the Eastern China Sea are the main areas in which juvenile Japanese Jack Mackerel are found due to the warmer waters.[10][8] This higher temperature allows for a higher survival rate for the growing fish, with 80 – 95.8% of all Japanese Jack Mackerel found in the southern Eastern China Sea being juveniles.[8] Due to the juveniles requiring a temperature above 19 °C to be able to develop and survive, vertical distribution is also very important and varies across the ages of the species.[8] Juveniles under the age of 1 year old are not found anywhere below 50 m deep and thrive in the 20 – 50 m depth range due to the higher temperatures.[8] Once mature, Japanese Jack Mackerels can be found at depths reaching up to 275 m.[2]

Biology and ecology

Life cycle

The life cycle of the Japanese jack mackerel starts in the late winter and tend to spawn around late April to early July, as water temperatures begin to rise allowing larvae and juveniles to thrive.[5][12] as an egg 0.87 – 0.9mm in diameter with a light brown oil globule 0.17 – 0.22mm in diameter which constitutes the yolk of the egg.[13] The location for spawning is dictated by several factors including phytoplankton productivity and migrating ability, but primarily temperature.[12] The eggs are Pelagic, therefore float freely through the open sea and continue to do so as larvae.[12] Once hatched, the larvae are 2.3 – 2.5mm in length and continue to carry the yolk sack beyond the anterior margin of the head.[13] This continues until the 4th day after hatching where the yolk sack is completely absorbed.[13] Development continues for 29 days before reaching the juvenile stage where the dorsal, pelvic, and anal rays and fins are developed, and the body is elongated to around 10 – 13 cm.[13][14] Throughout the juvenile stages, scutes and scales fully develop as well as rays on the pectoral and caudal fins until reaching full maturity at around 60 days after hatching and reaching an average length of around 35 cm.[2][13]

Feeding

As a juvenile, the Japanese jack mackerel mainly feeds on zooplankters, drift algae and flotsam throughout its developmental phases.[15] Throughout maturity, it has a much wider variety of species that it uses to feed on, although it mostly feeds on copepods which are small crustaceans normally 1 – 2 mm in size.[2][15] Additionally, the Japanese Jack Mackerel also feeds on small shrimp or other small fish.[2][15] The species normally hunts in large schools but in the case of individuals that are residing in reefs, they have been documented accompanying jellyfish for both feeding and protective purposed.[14] The jellyfish are not a part of the Jack Mackerel’s diet, but rather use the jellyfish as a method for food collection and a way to hide from predators when not a part of a larger school.[14]

Threats

As larvae and juveniles, the main threat posed to Japanese jack mackerel are other, larger fish which feed on the vulnerable developing fish as it lacks the mobility of a mature individual.[14] As a mature adult, the Jack Mackerel is hunted by other pelagic species such as tuna, sea lions, sharks, and dolphins.[14][15] Additionally, sea birds pose a great threat to both mature and juvenile Japanese Jack mackerel, as juveniles stay closer to the surface and adults venture to shallow waters to occasionally feed.[14][15]

Human interactions

Japanese Jack Mackerel in commercial packaging for purchase

Food

The Japanese jack mackerel is a fish predominantly caught using trawls, purse seines, traps and on line gear.[5] Due to the overfishing and exploitation of wild populations of Japanese Jack Mackerel and their major role in ocean ecosystems, annual catching limits have been applied since 1997.[5][9] This limitation has seen a drastic decrease in Jack Mackerel yields from up to 550,000 tons/year down to between 210,000 – 330,000 tons/year.[9] Most of the fish used commercially and for food globally is caught in the wild, with only a small percentage being bred through aquaculture productions.[5] Aquaculture of the Japanese Jack mackerel, similarly, capture production has dropped drastically over the year, with now less than 1000 tons/year being produced compared to the 7000 tons produced in the early 1990’s.[5][9]

Japanese jack mackerel are used in a few ways once caught and are generally canned for use in various dishes or are turned into fish meal.[5] Some traditional Japanese dishes use jack mackerel as a key ingredient and it is commonly deep fried ("aji furai" あじフライ), salt-grilled ("shioyaki aji" 塩焼きあじ) or used raw in sushi or as sashimi. In Korean cuisine, the jack mackerel is similarly used deep fried or grilled, and occasionally used in soups.

Capture of Japanese horse mackerel in tonnes from 1950 to 2009[4]

Conservation

In the 1960’s peak yields of Japanese jack mackerel were caught of around 550,000 tons/year, but before the 1970’s this number decreased to around 200,000 tons/year which was an indicator of overfishing.[5] In the early 1980’s less than 100,000 tons/year were caught, and the aquaculture production of jack mackerel begun to try and compensate for this loss of yield.[5] This decrease in capture production led to a catching limit which was applied in 1997 which stabilized the capture rate to around 210,000 – 330,00 tons/year.[5][9] Special conservation efforts have been put in place in Key spawning grounds of the jack mackerel including the Uwa Sea and Bungo Channel among the southern islands of Japan.[5][9] This was put in place in 2013 and was a direct response to lowered catch yields and higher volumes of juveniles being captured between 2004 and 2013.[9]

Culture

Although not a strong cultural icon, the Japanese jack mackerel is used in a large portion of both Japanese and Korean dishes and are an important global export for Japanese fisheries.[9] Additionally, due to the spawning grounds being tied to the Japanese coastal waters, efforts have been made by Japanese fisheries to prevent their exploitation.[5][9]

Phylogeny

The Japanese jack mackerel belongs to the family Carangidae which is a family of ray-finned fish such as jacks, pompanos, runners, and scads.[5] All species in this family have 2 or more dorsal fins with 15 – 31 rays coming from each of the caudal, anal, and dorsal fins.[16] The Genus Trachurus is a group of Jack Mackerels and Saurels which are derived from the Greek word trachys meaning “rough” and oura meaning “tail”.[5] The Japanese Jack Mackerel has been found to be more genetically similar to those under the family Scombridae, a family of mackerels, tuna, swordfish and dolphinfish.[17] Despite this, Trachurus Japonicus remains in the family Carangidae due to strong morphological differences between the families [17]

References

  1. ^ Carpenter, K.E.; Jiddawi, N.; Borsa, P.; Smith-Vaniz, W.F.; Yahya, S.; Obota, C. (2018). "Trachurus japonicus". IUCN Red List of Threatened Species. 2018: e.T20437783A67871570. doi:10.2305/IUCN.UK.2018-2.RLTS.T20437783A67871570.en. Retrieved 19 November 2021.
  2. ^ a b c d e f g h i j Froese, Rainer; Pauly, Daniel (eds.) (2019). "Trachurus japonicus" in FishBase. August 2019 version.
  3. ^ "Trachurus japonicus (Temminck and Schlegel, 1844)". Integrated Taxonomic Information System. Retrieved 12 March 2012.
  4. ^ a b Trachurus japonicus (Temminck & Schlegel, 1844) FAO, Species Fact Sheet. Retrieved 12 March 2012.
  5. ^ a b c d e f g h i j k l m n o p q Yoda, Mari; Shiraishi, Tetsuro; Yukami, Ryuji; Ohshimo, Seiji (2013-12-15). "Age and maturation of jack mackerel Trachurus japonicus in the East China Sea". Fisheries Science. 80 (1): 61–68. doi:10.1007/s12562-013-0687-5. ISSN 0919-9268. S2CID 2038917.
  6. ^ a b c d e f g h Suda, Yusuke; Shimizu, Makoto; Nose, Yukio (1987). "Confirmation of spawning groups of Japanese jack mackerel Trachurus japonicus in the low stock level period". Nippon Suisan Gakkaishi. 53 (10): 1789–1796. doi:10.2331/suisan.53.1789. ISSN 1349-998X.
  7. ^ a b c d e f SASSA, CHIYUKI; KONISHI, YOSHINOBU; MORI, KEN (November 2006). "Distribution of jack mackerel (Trachurus japonicus) larvae and juveniles in the East China Sea, with special reference to the larval transport by the Kuroshio Current". Fisheries Oceanography. 15 (6): 508–518. doi:10.1111/j.1365-2419.2006.00417.x. ISSN 1054-6006.
  8. ^ a b c d e KASAI, Akihide; KOMATSU, Kousei; SASSA, Chiyuki; KONISHI, Yoshinobu (February 2008). "Transport and survival processes of eggs and larvae of jack mackerel Trachurus japonicus in the East China Sea". Fisheries Science. 74 (1): 8–18. doi:10.1111/j.1444-2906.2007.01491.x. ISSN 0919-9268. S2CID 44020581.
  9. ^ a b c d e f g h i Nakamura, Takeshi; Hamano, Akira (2009-05-22). "Seasonal differences in the vertical distribution pattern of Japanese jack mackerel, Trachurus japonicus: changes according to age?". ICES Journal of Marine Science. 66 (6): 1289–1295. doi:10.1093/icesjms/fsp114. ISSN 1095-9289.
  10. ^ a b c Kanaji, Yu; Watanabe, Yoshiro; Kawamura, Tomohiko; Xie, Songguang; Yamashita, Yoh; Sassa, Chiyuki; Tsukamoto, Youichi (January 2009). "Multiple cohorts of juvenile jack mackerel Trachurus japonicus in waters along the Tsushima Warm Current". Fisheries Research. 95 (2–3): 139–145. doi:10.1016/j.fishres.2008.08.004. ISSN 0165-7836.
  11. ^ a b c Takahashi, Kohji; Masuda, Reiji; Yamashita, Yoh (March 2014). "Development of observational learning during school formation in jack mackerel Trachurus japonicus juveniles". Behavioural Processes. 103: 52–57. doi:10.1016/j.beproc.2013.10.012. ISSN 0376-6357. PMID 24220796. S2CID 22932224.
  12. ^ a b c MASUDA, Reiji; YAMASHITA, Yoh; MATSUYAMA, Michiya (April 2008). "Jack mackerel Trachurus japonicus juveniles use jellyfish for predator avoidance and as a prey collector". Fisheries Science. 74 (2): 276–284. doi:10.1111/j.1444-2906.2008.01522.x. ISSN 0919-9268. S2CID 39894384.
  13. ^ a b c d e Hashida, Daisuke; Matsumoto, Naoki; Tomiyama, Takeshi (2018-12-18). "Annual reproductive cycle and spawning ground formation in Japanese jack mackerel Trachurus japonicus in the Uwa Sea, Japan". Fisheries Science. 85 (2): 303–315. doi:10.1007/s12562-018-1276-4. ISSN 0919-9268. S2CID 56174348.
  14. ^ a b c d e f Sassa, Chiyuki; Kitajima, Satoshi; Nishiuchi, Kou; Takahashi, Motomitsu (2018-04-26). "Ontogenetic and inter-annual variation in the diet of Japanese jack mackerel (Trachurus japonicus) juveniles in the East China Sea". Journal of the Marine Biological Association of the United Kingdom. 99 (2): 525–538. doi:10.1017/s0025315418000206. ISSN 0025-3154. S2CID 91079802.
  15. ^ a b c d e "FAMILY Details for Carangidae – Jacks and pompanos". FishBase. 2021. Retrieved 27 April 2021.{{cite web}}: CS1 maint: url-status (link)
  16. ^ Liu, Yuan; Cui, Zhaoxia (June 2009). "The complete mitochondrial genome sequence of the cutlassfish Trichiurus japonicus (Perciformes: Trichiuridae): Genome characterization and phylogenetic considerations". Marine Genomics. 2 (2): 133–142. doi:10.1016/j.margen.2009.07.003. ISSN 1874-7787. PMID 21798182.
  17. ^ a b Notarbartolo di Sciara, Giuseppe; Podestà, Michela; Curry, Barbara E. (2016), "Preface", Advances in Marine Biology, Elsevier, 75: xxix–xxx, doi:10.1016/s0065-2881(16)30044-x, ISBN 978-0-12-805152-8, PMID 27770994, retrieved 2021-06-11
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Japanese jack mackerel: Brief Summary

provided by wikipedia EN

The Japanese jack mackerel (Trachurus japonicus), also known as the Japanese horse mackerel or Japanese scad, is a species named after its resemblance to mackerel but which is in the family Carangidae, the jacks, pompanos, trevallies and scads. Their maximum reported length is 50 cm (20 in) with a common length of 35 cm (14 in). They have a maximum reported weight of 0.66 kg (1.5 lb) and a maximum reported age of 12 years. They are found around the coast of Japan, apart from Okinawa Island, usually on sandy bottoms of 50–275 m (164–902 ft) deep. They feed mainly on small crustaceans such as copepods, and shrimps and small fish. They are similar to the yellowtail horse mackerel around New Zealand and Australia, apart from having more gill rakers and larger eyes.

The Japanese name for the horse mackerel is aji (あじ), and by default generally implies the species Trachurus japonicus (which can be more specifically referred to as ma-aji (まあじ), literally "true aji"). The name is most commonly written in hiragana; although a kanji () does exist, it is not in common use. It is commonly deep fried ("aji furai" あじフライ) or salt-grilled ("shioyaki aji" 塩焼きあじ).

In Korean cuisine, the fish is dubbed jeon-gaeng-i (전갱이) and is the default horse mackerel designated by this name. It is commonly grilled or fried as a jeon-gaeng-i gui (전갱이 구이). Among the specialties of Jeju cuisine is the soup gagjaegi-gug (각재기국), the name of which is derived from the name for the fish in the Jeju language.

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