Trichiurus lepturus
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The largehead hairtail (Trichiurus lepturus) or beltfish is a member of the cutlassfish family, Trichiuridae. This common to abundant species is found in tropical and temperate oceans throughout the world.[1][2] The Atlantic, East Pacific and Northwest Pacific populations are also known as Atlantic cutlassfish, Pacific cutlassfish and Japanese cutlassfish, respectively.
Largehead hairtails are silvery in color and elongated in shape with a thin pointed tail. They grow to Vorlage:Convert in length, although most only are Vorlage:Convert.[2] The largest recorded weight is Vorlage:Convert and the oldest recorded age is 15 years.[2]
Range and habitat
Largehead hairtails are found worldwide in tropical and temperate oceans.[2] In the East Atlantic it ranges from southern United Kingdom to South Africa, in the West Atlantic from Virginia (USA) to northern Argentina, and in the East Pacific from southern California (USA) to Peru. It is widespread in the Indo-Pacific region, but is absent from the central Pacific.[1]
Based on a study of fishing catches in the Jeju Strait of South Korea, the species mainly resides in water warmer than Vorlage:Convert, while catches are poor in colder water.[3] Off southern Brazil it mainly occurs in waters warmer than Vorlage:Convert.[4] It is absent from waters below Vorlage:Convert.[1] The largehead hairtail prefers relatively shallow coastal regions over muddy bottoms,[1] but it sometimes enters estuaries and has been recorded at depths of Vorlage:Convert.[2] It is mainly benthopelagic, but may occur at the surface during the night.[1]
Taxonomy
Although often considered a single highly widespread species,[2] it has been argued that it is a species complex that includes several species with the main groups being in the Atlantic (Atlantic cutlassfish), East Pacific (Pacific cutlassfish), Indo-Pacific and Northwest Pacific (Japanese cutlassfish). If split, the Atlantic would retain the scientific name T. lepturus. The Northwest Pacific (Sea of Japan and East China Sea) differs in morphometrics, meristics and genetics, and is sometimes recognized as T. japonicus.[5][6] Morphometric and meristic differences have also been shown in the population of the East Pacific (California to Peru), leading some to recognize it as T. nitens.[7] Additional studies are required on the possible separation and nomenclature of the Indo-Pacific populations, but based on mtDNA there are three species in this region: T. japonicus (marginal in the region, see range above), T. lepturus (West Pacific; the species also found in the Atlantic) and the final preliminarily referred to as Trichiurus sp. 2 (Indian Ocean, and East and South China Seas).[8] The names T. coxii and T. haumela have been used for the populations off Australia and in the Indo-Pacific, respectively, but firm evidence supporting their validity as species is lacking.[6][8]
Behavior
Juveniles participate in the diel vertical migration, rising to feed on krill and small fish during the night and returning to the sea bed in the day. This movement pattern is reversed by large adults, which mainly feed on fish.[2] Other known prey items include squid and shrimp, and the highly carnivorous adults regularly cannibalise younger specimens.[9]
Spawning depends on temperature as the larvae prefer water warmer than Vorlage:Convert and are entirely absent at less than Vorlage:Convert. Consequently, spawning is year-round in tropical regions, but generally in the spring and summer in colder regions.[10]
Fisheries and usage
Largehead hairtail is a major commercial species. With reported landings of more than 1.3 million tonnes in 2009, it was the 6th most important capture fish species. By far the largest catches were reported by China (1.2 million tonnes) from the NW Pacific (FAO Fishing Area 61); other countries reporting significant catches were South Korea, Japan, and Pakistan.[11]
In Korea, the largehead hairtail is called galchi (갈치), in which gal (갈) came from Middle Korean galh (갏) meaning "sword" and -chi (치) is a suffix for "fish".[12][13][14][15] It is popular for frying or grilling. In Japan, where it is known as tachiuo ("太刀(tachi)":sword, "魚(uo)":fish), they are fished for food and eaten grilled or raw, as sashimi. They are also called "sword-fish" in Portugal and Brazil (peixe-espada), where they are eaten grilled or fried. Its flesh is firm yet tender when cooked, with a moderate level of "fishiness" to the smell and a low level of oiliness. The largehead hairtail is also notable for being fairly easy to debone.
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Largehead hairtails at a fish market in Tokyo -
Galchi-gui (grilled largehead hairtail) -
Galchi-hoe (raw largehead hairtail) -
Galchi-jorim (simmered largehead hairtail)
References
External links
- ↑ a b c d e Referenzfehler: Ungültiges
<ref>-Tag; kein Text angegeben für Einzelnachweis mit dem Namen iucn. - ↑ a b c d e f g Vorlage:FishBase species
- ↑ Study on the Assembling Mechanism of the Hairtail, Trichiurus Lepturus, at the Fishing Grounds of the Cheju Strait. In: Journal of the Korean Society of Fisheries Technology. 34. Jahrgang, Nr. 2, 1998, S. 177-134.
- ↑ Martins, A.G., Haimovici, M.: Distribution, abundance and biological interactions of the cutlassfish Trichiurus lepturus in the southern Brazil subtropical convergence ecosystem. In: Fisheries Research. 30. Jahrgang, Nr. 3, 1997, S. 217–227.
- ↑ Chakraborty, A., Aranishi, F., Iwatsuki, Y.: Genetic differentiation of Trichiurus japonicus and T. lepturus (Perciformes: Trichiuridae) based on mitochondrial DNA analysis. In: Zoological Studies. 45. Jahrgang, Nr. 3, 2006, S. 419–427 (edu.tw [PDF]).
- ↑ a b Tzeng, C.H., Chen, C.S., Chiu, T.S.: Analysis of morphometry and mitochondrial DNA sequences from two Trichiurus species in waters of the western North Pacific: taxonomic assessment and population structure. In: Journal of Fish Biology. 70. Jahrgang, 2007, S. 165, doi:10.1111/j.1095-8649.2007.01368.x.
- ↑ Burhanuddin, A.I., Parin, N.V.: Redescription of the trichiurid fish, Trichiurus nitens Garman, 1899, being a valid of species distinct from T. lepturus Linnaeus, 1758 (Perciformes: Trichiuridae). In: Journal of Ichthyology. 48. Jahrgang, Nr. 10, 2008, S. 825, doi:10.1134/S0032945208100019.
- ↑ a b Hsu, K.C., Shih, N.S., Ni, I.H., Shao, K.T.: Speciation and population structure of three Trichiurus species based on mitochondrial DNA. In: Zoological Studies. 48. Jahrgang, Nr. 6, 2009, S. 835–849 (edu.tw [PDF]).
- ↑ Bittar, Awabdi, Tonini, Vidal Junior, Madeira Di Beneditto: Feeding preference of adult females of ribbonfish Trichiurus lepturus through prey proximate-composition and caloric values. In: Neotrop. Ichthyol. 10. Jahrgang, Nr. 1, 2012, S. 197, doi:10.1590/S1679-62252012000100019.
- ↑ Martins, A.G., Haimovici, M.: Reproduction of the cutlassfish Trichiurus lepturus in the southern Brazil subtropical convergence ecosystem. In: Scientia Marina. 64. Jahrgang, Nr. 1, 2000, S. 97–105 (csic.es [PDF]).
- ↑ FAO (Food and Agriculture Organization of the United Nations): Yearbook of fishery and aquaculture statistics 2009. Capture production. FAO, Rome 2011, S. 27, 202–203 (fao.org [PDF]).
- ↑ galchi. (Originaltitel: ko:갈치). In: Standard Korean Language Dictionary. National Institute of Korean Language, abgerufen am 4. Juni 2017 (koreanisch).
- ↑ Ihaeng Sin, Gyeongjun Gim, Jinam Gim: Yeogeo yuhae. (Originaltitel: 역어유해(譯語類解), deutsch: Categorical Analysis of the Chinese Language Translation). Sayeogwon, Joseon Kora 1960 (Middle, korean).
- ↑ galh. (Originaltitel: ko:갏). In: Standard Korean Language Dictionary. National Institute of Korean Language, abgerufen am 4. Juni 2017 (koreanisch).
- ↑ 윤표 홍: ‘가물치’와 ‘붕어’의 어원. In: National Institute of Korean Language. 1. September 2006, abgerufen am 4. Juni 2017 (koreanisch).