Telatrygon zugei ist eine Stechrochenart und lebt im nördlichen Indopazifik an Küsten und in Flussmündungen zwischen Indien, Indonesien (östlich bis Java) und des südlichen Japan.
Telatrygon zugei erreicht eine Gesamtlänge von maximal 75 cm bei bis zu 29 cm Scheibenbreite. Er hat eine rautenförmige Brustflossen-Scheibe die zur Schnauze hin lang und spitz ausläuft. Der Schwanz ist peitschenartig, deutlich länger als die Scheibe und trägt einen Giftstachel. Die Oberseite ist schokoladenbraun, zum Schwanz hin dunkler; die Unterseite ist weiß mit einem hellbraunen Randstreife.
Der Rochen lebt bodennah meist über sandigem Grund an Küsten in Tiefen bis 100 m sowie in Flussmündungen. Dort jagt er bevorzugt kleine Krustentiere, hauptsächlich Garnelen, aber auch kleinere Fische. Er ist ovovivipar mit Würfen von ein bis vier Jungtieren, die Scheibenbreiten von sieben bis zehn Zentimetern aufweisen. Im Uterus ernähren sich die Embryos zunächst vom Eidotter, dann von einer schleimigen, vom Uterus ausgeschiedenen, schleimigen Flüssigkeit die mit Fett und Proteinen angereichert ist. Oft wird er als Beifang eingebracht und sein Fleisch wird verwertet. Wegen der starken Befischung seines Lebensraums gilt er inzwischen als gering gefährdet.
Die Rochenart wurde im Jahr 1841 durch die deutschen Naturwissenschaftler Johannes Müller und Jakob Henle unter der wissenschaftlichen Bezeichnung Trygon zugei beschrieben, später dann der Gattung Dasyatis zugeordnet. Bei einer Mitte 2016 erfolgten Revision der Dasyatidae wurde die Art in die neu eingeführte Gattung Telatrygon gestellt.[1]
Telatrygon zugei ist eine Stechrochenart und lebt im nördlichen Indopazifik an Küsten und in Flussmündungen zwischen Indien, Indonesien (östlich bis Java) und des südlichen Japan.
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The pale-edged stingray or sharpnose stingray (Dasyatis zugei) is a species of stingray in the family Dasyatidae, found in the Indian and Pacific Oceans from India to the western Malay Archipelago and southern Japan. This bottom-dwelling ray is most commonly found over sandy areas shallower than 100 m (330 ft), as well as in estuaries. Measuring up to 29 cm (11 in) across, the pale-edged stingray has a diamond-shaped pectoral fin disc, a long projecting snout, small eyes, and a whip-like tail with both dorsal and ventral fin folds. It is chocolate brown above and white below.
The diet of the pale-edged stingray consists mainly of small crustaceans and fishes. Reproduction is aplacental viviparous, with females bearing litters of 1–3 young. Caught as bycatch and utilized for its meat, this species is threatened by heavy fishing pressure throughout its range and has been assessed as Vulnerable by the International Union for Conservation of Nature (IUCN).
German biologists Johannes Müller and Friedrich Henle originally described the pale-edged stingray from seven syntypes, in their 1841 Systematische Beschreibung der Plagiostomen. They named it Trygon zugei after zugu-ei, the Japanese name for this species. The genus Trygon was synonymized with Dasyatis by subsequent authors.[2] Several early accounts of D. zugei were confounded by specimens of D. acutirostra; in 1988 Nishida and Nakaya published a study that resolved the differences between these two species and designated a new lectotype for D. zugei.[3]
Lisa Rosenberger's 2001 phylogenetic analysis, based on morphological characters, found that the pale-edged stingray is sister to a clade containing the whitespotted whipray (Himantura gerrardi), the pearl stingray (D. margaritella), and the smooth butterfly ray (Gymnura micrura). These results support the growing consensus that neither Dasyatis nor Himantura are monophyletic.[4]
The range of the pale-edged stingray extends from the Indian subcontinent eastward to Java and Borneo, and northward to the Philippines and southern Japan.[5] This species inhabits the inner continental shelf, favoring sandy flats in water under 100 m (330 ft) deep, and also frequently enters estuaries.[1][6]
The pale-edged stingray has a diamond-shaped pectoral fin disc slightly longer than wide, with concave anterior margins merging into an elongated, triangular snout; the head comprises more than half of the disc length. The eyes are small, with a pair of much larger spiracles immediately behind. There is a nearly rectangular curtain of skin between the nares, with a fringed rear margin. The mouth is gently curved, without papillae on the floor. There are 40–55 tooth rows in either jaw, arranged with a quincunx pattern into pavement-like surfaces. The teeth of adult males have pointed cusps while those of juveniles and females are blunt.[3][7]
The pelvic fins are triangular. The tail is whip-like, much longer than the disc, and bears a stinging spine. A low dorsal fin fold originates just posterior of the spine tip while a deeper ventral fin fold originates below the spine base. Young individuals have smooth skin, while adults have a row of 5–9 small tubercles in front of the spine. The dorsal surface is a uniform chocolate brown, darkening on the tail fin folds, while the underside is white with a brown band around the margin of the disc.[3] This species reaches a length of 75 cm (30 in) and width of 29 cm (11 in), though most do not exceed 18–24 cm (7.1–9.4 in) in width.[1][5] The pale-edged stingray differs from the similar but larger D. acutirostra in having smaller eyes and an upper tail fin fold, as well as in several meristic counts such as the number of intestinal valves.[3]
The pale-edged stingray feeds mainly on bottom-dwelling crustaceans, in particular prawns, but also takes small fishes.[1][6] Parasites that have been identified from this species include the tapeworms Acanthobothrium zugeinensis,[8] Balanobothrium yamagutii,[9] Pithophorus zugeii,[10] Polypocephalus ratnagiriensis and P. visakhapatnamensis,[11][12] Rhinebothrium xiamenensis,[13] Shindeiobothrium karbharae,[14] Tetragonocephalum raoi,[15] Tylocephalum singhii,[16] and Uncibilocularis indiana and U. veravalensis,[17][18] and the capsalid monogenean Trimusculotrema schwartzi.[19] Like other stingrays, the pale-edged stingray is aplacental viviparous, with the young sustained initially by yolk and later histotroph ("uterine milk") secreted by the mother. Females give birth to 1–3 young at a time; there is no defined reproductive seasonality, at least in Indonesian waters. Newborns measure 8–10 cm (3.1–3.9 in) across. Males mature sexually at a disc width of 18 cm (7.1 in) and females at a disc width of 19 cm (7.5 in).[1]
Large numbers of pale-edged stingrays are caught incidentally in bottom trawls and trammel nets, particularly in the Gulf of Thailand, the Java Sea, and off the Indian coast. Most individuals landed are retained for human consumption, although the small size of this species limits its economic significance.[1][6] The IUCN has assessed the pale-edged stingray as near threatened and notes that it is vulnerable. Across most of its range, this species experiences heavy and increasing fishing pressure, with all size classes susceptible to capture.[1]
Historical image of Dasyatis zugei by Kawahara Keiga, 1823–1829. The pale-edged stingray or sharpnose stingray (Dasyatis zugei) is a species of stingray in the family Dasyatidae, found in the Indian and Pacific Oceans from India to the western Malay Archipelago and southern Japan. This bottom-dwelling ray is most commonly found over sandy areas shallower than 100 m (330 ft), as well as in estuaries. Measuring up to 29 cm (11 in) across, the pale-edged stingray has a diamond-shaped pectoral fin disc, a long projecting snout, small eyes, and a whip-like tail with both dorsal and ventral fin folds. It is chocolate brown above and white below.
The diet of the pale-edged stingray consists mainly of small crustaceans and fishes. Reproduction is aplacental viviparous, with females bearing litters of 1–3 young. Caught as bycatch and utilized for its meat, this species is threatened by heavy fishing pressure throughout its range and has been assessed as Vulnerable by the International Union for Conservation of Nature (IUCN).
Telatrygon zugei es una especie de pez de la familia Dasyatidae en el orden de los Rajiformes.
Los machos pueden llegar alcanzar los 29 cm de longitud total.[2][3]
Come organismos bentónicos, principalmente peces y crustáceos pequeños.
Es ovíparo.
Es un pez de mar y de clima tropical demersal.
Se encuentra desde la India hasta el sur del Japón, Birmania, Malasia, Indonesia, la China e Indochina.
Es inofensivo para los humanos.
Telatrygon zugei es una especie de pez de la familia Dasyatidae en el orden de los Rajiformes.
Dasyatis zugei Dasyatis generoko animalia da. Arrainen barruko Dasyatidae familian sailkatzen da.
Dasyatis zugei Dasyatis generoko animalia da. Arrainen barruko Dasyatidae familian sailkatzen da.
