Sillaginopsis panijus és una espècie de peix de la família dels sil·lagínids i i l'única del gènere Sillaginopsis[2] distribuït a l'oest de l'Oceà Índic des del delta del Ganges, Birmània, Malàisia i, rarament també, Indonèsia.[3] Els mascles poden assolir els 44 cm de longitud total.[3]
Sillaginopsis panijus és una espècie de peix de la família dels sil·lagínids i i l'única del gènere Sillaginopsis distribuït a l'oest de l'Oceà Índic des del delta del Ganges, Birmània, Malàisia i, rarament també, Indonèsia. Els mascles poden assolir els 44 cm de longitud total.
The Gangetic whiting, Sillaginopsis panijus (also known as the flathead sillago), is a species of inshore marine and estuarine fish of the smelt-whiting family, Sillaginidae. It is the most distinctive Asian member of the family due to its flattened head and trailing dorsal fins. Although first described in 1822, it was not placed in its own genus until 1861 when Theodore Gill erected Sillaginopsis, a genus which is still monotypic. Gangetic whiting are of minor commercial importance along the Southeast coast of the Asian continent where it inhabits protected areas.
The Gangetic whiting is the only species of the genus Sillaginopsis, which itself is one of three genera the family Sillaginidae, containing all the smelt whitings. The Sillaginidae are part of the Percoidei, a suborder of the order Perciformes.[1]
The Gangetic whiting was originally named Cheilodipterus panijus in 1822 by Francis Buchanan-Hamilton from a holotype taken from the Ganges estuary in India. The species was further examined by Gill in 1861 in the first review of the family, entitled "Synopsis of the Sillaginoids", which led to the creation of the genus Sillaginopsis. This new classification changed the binomial name to the currently accepted Sillaginopsis panijus.[2]
The distinct appearance of the Gangetic whiting makes it the easiest of the smelt whitings to identify. The head of the species is highly depressed, like that of the flatheads, with very small eyes well constricted by the orbits.[3] The first dorsal fin contains ten spines including a large trailing second spine; the second dorsal fin has one spine and 25 to 27 soft rays. The anal fin has two spines and 24 to 27 soft rays. There are 84 to 90 lateral line scales and the species has a total of 42 vertebrae. The species is known to grow to a length of 44 cm.[4]
Another unique feature of this species is its severe reduction or even absence of a swim bladder, which all other members of the family Sillaginidae possess. The Gangetic whiting also has a small mouth with a much shorter lower jaw than upper jaw, with the two anteriormost teeth larger than the rest.[2]
The Gangetic whiting is found on the southern Asian coast from Puducherry in the east, northward along the Coromandel Coast and the Ganges delta, Myanmar, Malaysia and occasionally as far south as the Indonesian archipelago.[2]
The species is often found on silty or muddy substrates in shallow, open bays and estuaries along the coast. Juveniles usually migrate into the upper reaches of estuaries for protection against predation by larger species.[3]
Gut content analysis has found the Gangetic whiting consumes numerous small fish, benthic and planktonic crustaceans and algae, with its small mouth size restricting the size of food portions.[4]
The Gangetic whiting is the only known species of fish to host the intestinal parasite Dichelyne alatae, found in specimens in West Bengal,[5] with a number of other parasites identified from it.
Otolith and size-age composition studies by Krishnayya (1963) of the commercial catches from the Hooghly River estuary and found that S. panijus probably spawns twice a year during the periods of November to February and August to September. The juveniles migrate toward the upper reaches during March and April and during December where they remain for two to three months. Sexual maturity is attained at a length of about 120 mm.[6]
A local fishery exists along the coast of the Bay of Bengal primarily near or on the river deltas, with commercially important fish captured by nets and longlines in the Hooghly and Ganges delta. The Gangetic whiting is sold fresh in local markets, rarely making its way to overseas markets.[2] Juvenile Sillaginopsis panijus are also occasionally traded as brackish water aquarium fish.[7]
The Gangetic whiting, Sillaginopsis panijus (also known as the flathead sillago), is a species of inshore marine and estuarine fish of the smelt-whiting family, Sillaginidae. It is the most distinctive Asian member of the family due to its flattened head and trailing dorsal fins. Although first described in 1822, it was not placed in its own genus until 1861 when Theodore Gill erected Sillaginopsis, a genus which is still monotypic. Gangetic whiting are of minor commercial importance along the Southeast coast of the Asian continent where it inhabits protected areas.
El silago chato (Sillaginopsis panijus) es una especie de peces,[1] la única del género Sillaginopsis, de la familia Sillaginidae en el orden de los Perciformes.
Los machos pueden llegar alcanzar los 44 cm de longitud total.[2] Tiene once espinas en la aleta dorsal y dos espinas en la anal, siendo la segunda espina dorsal muy larga.[1] Poseen una característica cabeza muy deprimida, con unos ojos muy pequeños.[1]
Se encuentra en el oeste del Océano Índico: el delta del Ganges, Birmania, Malasia y más raramente también en Indonesia. Vive tanto en el mar como en estuarios y aguas de río, con comportamiento demersal y anfídromo,[3] con dieta omnívora de peces, crustáceos y algas.[1]
El silago chato (Sillaginopsis panijus) es una especie de peces, la única del género Sillaginopsis, de la familia Sillaginidae en el orden de los Perciformes.
Sillaginopsis panijus Sillaginopsis generoko animalia da. Arrainen barruko Sillaginidae familian sailkatzen da.
Sillaginopsis panijus Sillaginopsis generoko animalia da. Arrainen barruko Sillaginidae familian sailkatzen da.
Sillaginopsis panijus is een straalvinnige vis uit de familie van de witte baarzen (Sillaginidae) en behoort derhalve tot de orde van baarsachtigen (Perciformes). Het is de enige soort uit het geslacht Sillaginopsis. De vis kan een lengte bereiken van 44 cm.
De soort komt zowel in zoet, brak als zout water voor. De vis prefereert een tropisch klimaat en leeft hoofdzakelijk in de Indische Oceaan.
Sillaginopsis panijus is voor de visserij van aanzienlijk commercieel belang. In de hengelsport wordt er weinig op de vis gejaagd.
Sillaginopsis panijus is een straalvinnige vis uit de familie van de witte baarzen (Sillaginidae) en behoort derhalve tot de orde van baarsachtigen (Perciformes). Het is de enige soort uit het geslacht Sillaginopsis. De vis kan een lengte bereiken van 44 cm.
分類 界 : 動物界 Animalia 門 : 脊索動物門 Chordata 亜門 : 脊椎動物亜門 Vertebrata 綱 : 条鰭綱 Actinopterygii 目 : スズキ目 Perciformes 科 : キス科 Sillaginidae 属 : イトヒキギス属 Sillaginopsis
イトヒキギス(Sillaginopsis panijus)はキスの一種。ベンガル湾岸に生息する。平たい頭と長く伸びた背鰭が特徴。現地で漁獲され、食用・観賞用として取引される。
Sillaginopsis属は単型であり、他の2属とともにキス科を構成する[1]。
1822年、Francis Buchanan-HamiltonによってCheilodipterus panijusとして記載された。ホロタイプはガンジス・デルタ産。1861年、Theodore Gillは"Synopsis of the Sillaginoids"の中でキス科の分類を再編し、Sillaginopsis属が創設され学名はSillaginopsis panijusとなった[2]。
南アジア沿岸に分布する。ポンディシェリからコロマンデル海岸、ガンジス・デルタ、ミャンマー・マレーシア・稀にインドネシアでも確認されている[2]。
沿岸の湾・三角江の泥底に生息する。幼魚は外敵を避けるため河川に進入する[3]。
形態から他のキス科魚類とはすぐに区別できる。頭部は強く縦扁し、眼は非常に小さい[3]。第一背鰭は10棘で、第二棘の先端が長く伸びる。第二背鰭は1棘25-27軟条。尻鰭は2棘24-27軟条。側線鱗数は84-90、脊椎骨数は42。44cmまで成長する[4]。
他のキス科魚類には鰾があるが、本種ではほぼ消失する。口は小さく、下顎が上顎より短く、最前方の2本の歯が他の歯より大きい[2]。
消化管内容物の分析から、小魚・甲殻類・藻類を食べることが示された。口が小さいため、餌の大きさは限られる[4]。
西ベンガル州の標本から、固有の消化管寄生虫Dichelyne alatae[5]を始めとした寄生虫が発見されている。
Krishnayya(1963)によるフーグリー川三角江での耳石を用いた年齢構成調査では、年2回、11-2月・8-9月に繁殖することが示された。稚魚はそれぞれ3-4月・12月に川を遡り、2-3か月過ごす。全長120mmで性成熟する[6]。
ベンガル湾沿岸・フーグリー川・ガンジス川デルタなどで漁網や延縄で漁獲される。重要種であるが、現地で消費されるため海外への輸出は少ない[2]。稚魚は汽水性観賞魚として取引されることもある[7]。
