View data on Catalog of Fishes here.
Dorsal-fin rays 8; anal-fin rays 11; pectoral-fin rays 10–11; total gill rakers (rarely 18) 19–23 (rarely 24); vertebrae (rarely 36) 37–38. Dwarf species rarely exceeding 38 mm SL; trunk very long and narrow; its depth at origin of anal photophores three or more times into greatest body depth, subcaudal photophores well separated from anals; dorsal spine medium-to-high, its height often exceeds its length; post-temporal spines well developed; postabdominal spines fused to form a single spine complex; lower preopercle spine directed ventrally, the upper posterio-dorsally; jaws medium; teeth small to minute; gill rakers long and numerous; in preservative abdominal region dark, trunk pigmentless except in definite patches along midline and above anal and subcaudal photophore groups.
Two pigment forms designated form "A" and form "B" occur over much of the species range. Form A is characterized by distinct and clearly defined body pigmentation, while in form B, the body pigmentation is quite diffuse. This pigment difference is not a function of size or sex, is intermediate in few individuals, and both forms do occur syntopically. A morphometric analysis of three sympatric populations in several characters and meristics, plus measurements from one or the other pigment forms from other areas by Baird (1971) failed to show any significant difference between sympatric populations. In addition, there was no consistent sorting out over the range of variability of any one form in any character. Analysis of diurnal depth distributions revealed a marked sorting out of pigment types with the A form most numerous during the day while the B form was predominantly caught at night.
Differs from all other species in genus Argyropelecus by its narrow trunk, single postabdominal spine, small size, minute teeth, presence of only eight dorsal and eleven anal rays.
Occurs in the South Atlantic around the Falkland Islands and abundantly off the southeast coast of Brazil; a scattering of catches along latitude 35° S to the Cape of Good Hope suggests a broad distribution across the South Atlantic; occurs in small catches along the southwest African coast, appears absent in the Gulf of Guinea, but occurs in the western tropical Atlantic; is taken in moderate numbers in the Caribbean and Gulf of Mexico and abundantly in the western Atlantic; is abundant across the North Atlantic and the eastern North Atlantic as far south as the Cape Verdes Islands; it represents the only species of this family in the Mediterranean, where it occurs abundantly in the western basin; scattered moderate-to-small catches are present from to 12°S latitude in the central Indian Ocean, and another population is scattered from 20° S to 40° S with several small catches reported from the southeastern and southwestern Indian Ocean; a single catch off the Philippines, another at 42°N, I69°E, and small catches from the Banda Sea and near Hawaii represent this species in the west and central Pacific; large populations occur off California and Chile; it is taken abundantly across the Southern Ocean from 35°– 55°S latitude from Chile to New Zealand; taken in small numbers in the Tasman Sea and off Sidney, Australia.
Occurs from 200 m to 700 m by day with the greatest concentration between 350– 550 m; occurs from 100 m to 650 m by night with concentrations between 150–380 m; tropical submergence indicated in the Gulf and Caribbean by examining number of catches above 200 m compared with the North Atlantic; by day it appears to concentrate at about 550 m in the Sargasso Sea.
Baird RC. 1971. The Systematics, Distribution, and Zoogeography of the Marine Hatchetfishes (family Sternoptychidae). Bulletin of the Museum of Comparative Zooology 142(1):1–128.
Baird RC. 1971. The Systematics, Distribution, and Zoogeography of the Marine Hatchetfishes (family Sternoptychidae). Bulletin of the Museum of Comparative Zooology 142(1):1–128.
Rarely exceeds about 40 mm SL.
Messina, Sicily, Italy, Mediterranean Sea.
No types known.
Argyropelecus hemigymnus és una espècie de peix pertanyent a la família dels esternoptíquids.[5]
És ovípar amb larves i ous planctònics.[9]
Menja copèpodes i peixets.[10]
A l'Estat espanyol és depredat per la llampuga (Coryphaena hippurus) i Ophichthus rufus, a Nova Zelanda per Micromesistius australis i a Grècia pel lluç europeu (Merluccius merluccius).[11][12][13]
És un peix marí i batipelàgic que viu entre 0-2.400 m de fondària (normalment, entre 250 i 600).[6][14]
Es troba a l'Atlàntic oriental (des del nord de les illes Britàniques fins a Sud-àfrica, incloent-hi la Mediterrània occidental), l'Atlàntic occidental (des del Canadà i Nova Jersey fins a l'Argentina), el Pacífic oriental i el mar de la Xina Meridional. Tot i així, és conegut a les aigües de clima tropical i subtropical de tots els oceans.[6][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54]
Els adults fan migracions verticals diàries.[55][56]
La seua esperança de vida és d'1 any.[57]
És inofensiu per als humans.[6]
Argyropelecus hemigymnus és una espècie de peix pertanyent a la família dels esternoptíquids.
Argyropelecus hemigymnus ist ein Tiefseefisch aus der Familie der Tiefsee-Beilfische (Sternoptychidae), der weltweit in fast allen tropischen und gemäßigten Meeren vorkommt, u. a. im westlichen und mittleren Mittelmeer und im Nordostatlantik nördlich der britischen Inseln.
Argyropelecus hemigymnus wird maximal 3,9 cm lang und hat die für Tiefsee-Beilfische typische, tiefbauchige, seitlich stark abgeflachte Gestalt. Seine Färbung ist hell silbrig und wird in der Nacht dunkel. Die Anzahl der Wirbel liegt bei 36 bis 39, die der Branchiostegalstrahlen bei 10.
Argyropelecus hemigymnus lebt für gewöhnlich in Tiefen von 250 bis 600 Metern, man fing ihn jedoch auch in Tiefen von bis zu 2400 Metern. Ausgewachsene Tiere führen Vertikalwanderungen durch. Sie leben einzeln oder in kleinen Gruppen und ernähren sich von Ruderfußkrebsen, weiteren Krebstieren, kleinen Fischen und anderen kleinen Beutetieren. Eier und Larven der Fische sind planktonisch.
Argyropelecus hemigymnus ist ein Tiefseefisch aus der Familie der Tiefsee-Beilfische (Sternoptychidae), der weltweit in fast allen tropischen und gemäßigten Meeren vorkommt, u. a. im westlichen und mittleren Mittelmeer und im Nordostatlantik nördlich der britischen Inseln.
Argyropelecus hemigymnus, the half-naked hatchetfish, short silver hatchetfish or spurred hatchetfish, is a deep-sea hatchetfish of the genus Argyropelecus found mesopelagically in the Atlantic, Indian, and Pacific Oceans as well as in the Mediterranean Sea.[1][2] It is a small species rarely exceeding 38 millimetres (1.5 in) standard length.[3] It feeds on zooplankton, particularly ostracods and copepods.[4][5] Sexual maturation occurs at length of about 22 mm, and adult males have more developed olfactory organs than females, i.e. the species is sexually dimorphic.[6]
Argyropelecus hemigymnus, the half-naked hatchetfish, short silver hatchetfish or spurred hatchetfish, is a deep-sea hatchetfish of the genus Argyropelecus found mesopelagically in the Atlantic, Indian, and Pacific Oceans as well as in the Mediterranean Sea. It is a small species rarely exceeding 38 millimetres (1.5 in) standard length. It feeds on zooplankton, particularly ostracods and copepods. Sexual maturation occurs at length of about 22 mm, and adult males have more developed olfactory organs than females, i.e. the species is sexually dimorphic.
El pez hacha ganchudo (Argyropelecus hemigymnus) es una especie de pez estomiforme de la familia Sternoptychidae.[1] No se reconocen subespecies.[1] Se encuentra en aguas tropicales y subtropicales de todos los océanos, así como en el mar Mediterráneo.[2]
El pez hacha ganchudo (Argyropelecus hemigymnus) es una especie de pez estomiforme de la familia Sternoptychidae. No se reconocen subespecies. Se encuentra en aguas tropicales y subtropicales de todos los océanos, así como en el mar Mediterráneo.
Argyropelecus hemigymnus Argyropelecus generoko animalia da. Arrainen barruko Sternoptychidae familian sailkatzen da.
Espezie hau Egeo itsasoan aurki daiteke.
Argyropelecus hemigymnus Argyropelecus generoko animalia da. Arrainen barruko Sternoptychidae familian sailkatzen da.
L'ascia d'argento o pesce ascia o pesce accetta (Argyropelecus hemigymnus) è un pesce abissale della famiglia Sternoptychidae.
Questo pesce è diffuso nell'Oceano Atlantico e nel mar Mediterraneo, mar Adriatico compreso.
Vive a grandi profondità, fino a 3000 m ed ha abitudini pelagiche. Compie migrazioni a profondità inferiori durante la notte.
Ha una sagoma assolutamente inconfondibile, alta e pressoché trapezoidale la parte anteriore, con una spina acuta su entrambi gli "spigoli" nella parte inferiore e molto più sottile nel segmento caudale. Gli occhi sono molto grandi, telescopici e rivolti verso l'alto. La bocca è molto grande, dorsale. La pinna dorsale, breve, è preceduta da alcune spine e seguita da una pinna adiposa lunga e stretta. Le pinne pettorali sono lunghe e inserite in basso. La pinna caudale è grande e forcuta. I fotofori sono grandi, in numero di 35, disposti lungo il profilo ventrale del corpo e suddivisi in sei gruppi.
Il colore dell'animale è argenteo, molto lucente. La luce emessa dai fotofori è rosea.
Misura fino a 6 cm di lunghezza.
Si ciba soprattutto di crostacei planctonici.
Si riproduce tutto l'anno, con un massimo in primavera, le uova sono galleggianti e se ne schiude una larva che assume l'aspetto tipico dell'adulto a circa 7 mm di lunghezza.
Come molti altri pesci abissali questa specie si può trovare spiaggiata sulle coste dello Stretto di Messina. Questi spiaggiamenti permisero nel XIX secolo di studiare la fauna abissale quando ancora non erano possibili le spedizioni oceanografiche.
L'ascia d'argento o pesce ascia o pesce accetta (Argyropelecus hemigymnus) è un pesce abissale della famiglia Sternoptychidae.
Argyropelecus hemigymnus is een straalvinnige vissensoort uit de familie van diepzeebijlvissen (Sternoptychidae).[2] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1829 door Cocco.
De soort staat op de Rode Lijst van de IUCN als niet bedreigd, beoordelingsjaar 2009. De omvang van de populatie is volgens de IUCN stabiel.[1]
Bronnen, noten en/of referentiesTopornik wyłupiasty[3], topornik mały[4] (Argyropelecus hemigymnus) – gatunek morskiej ryby wężorokształtnej z rodziny przeźreniowatych (Sternoptychidae).
Gatunek batypelagiczny, występuje we wszystkich oceanach od 60° N do 56° S na głębokościach 0–2400 m[5].
Nie ma znaczenia gospodarczego.
Topornik wyłupiasty, topornik mały (Argyropelecus hemigymnus) – gatunek morskiej ryby wężorokształtnej z rodziny przeźreniowatych (Sternoptychidae).
O peixe-machadinha (Argyropelecus hemigymnus) é uma espécie de peixe que mede entre 3 e 3.9 centímetros, vivendo em profundidades que variam entre 250 e 600 metros.
Comprimento máximo: 3.9 cm; idade máxima : 1 ano
Marinho; batiplágico; vive entre as profundidades de 0 a 2400 m, sendo que normalmente vive entre os 250 e os 600 m. Latitude 60°N - 56°S
Espinhas dorsais: 0; raios dorsais moles: 8 ou 9; espinhas anais 0; raios anais moles: 11 ou 12; vértebras entre 36 e 39. Raios branquióstegos: 10. Corpo de cor prateada brilhante; corpo e tronco com coloração escura à noite.
Pouco preocupante
Referências (internet)
http://species-identification.org/species.php?species_group=fnam&id=1363
http://www.marinespecies.org/aphia.php?p=taxdetails&id=127309
http://fishbase.sinica.edu.tw/summary/speciessummary.php?id=6968
http://skaphandrus.com/pt/marine_species/info/species/Argyropelecus_hemigymnus[ligação inativa]
O peixe-machadinha (Argyropelecus hemigymnus) é uma espécie de peixe que mede entre 3 e 3.9 centímetros, vivendo em profundidades que variam entre 250 e 600 metros.
半裸銀斧鱼(学名:Argyropelecus hemigymnus,又稱单刺银斧鱼)为輻鰭魚綱巨口魚目褶胸鱼科银斧鱼属的其中一種鱼类。
半裸銀斧鱼分布於三大洋熱帶及亞熱帶,包括印度洋、地中海、太平洋、大西洋以及南海等海域,棲息深度約100-2400公尺[1]。
半裸銀斧鱼身體為明亮的銀色,背鰭軟條8-9枚;臀鰭軟條11-12枚;脊椎骨36-39枚,體長可達3.9公分。
半裸銀斧鱼為深海魚類,會進行垂直性洄游,屬肉食性,以橈腳類及小魚等為食,雄魚體型略小於雌魚。