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The longheaded eagle ray (Aetobatus flagellum) is a species of eagle ray in the family Myliobatidae. The longheaded eagle ray, like other members of the genus Aetobatus, is characteristically different from other genera of eagle rays, distinguished by their notched nasal curtain; complete, singular set of upper and lower teeth; and v-shaped teeth in the lower jaw.[2] It is found in the tropical and warm temperate Indo-West Pacific. It formerly included populations in the northwest Pacific, but these were recognized as a separate species, Aetobatus narutobiei, in 2013.[3] Longheaded eagle rays are benthopelagic fishes that feed on crustaceans, cephalopods, echinoderms, and small bony fishes. It is a poorly known species, but generally uncommon and considered endangered by the IUCN.[1]
Longheaded eagle rays have a prominent cephalic fin attached to the snout, projecting up and away from the head. Eyes are located laterally on the dorsal side of the head. Spiracles are located posterior to the eyes. Pectoral fins are separate from, and posterior to the head. Longheaded eagle rays have a diamond-shaped disc with relatively large, narrowly triangular pectoral fins that round near the rear tips. The dorsal fin is located between the pectoral fins. The longheaded eagle ray lacks a caudal fin. The tail of the longheaded eagle ray is one of their distinguishing features, measuring up to three times their body length, tapering from base to spine.[4]
Longheaded eagle rays are unique in the genus Aetobatus in that they have no spotted coloration on their dorsal plane. The dorsal side of their disc is uniformly greenish-brown, with no apparent spotting. The ventral side of the disc is primarily white with green-brown mottling along the perimeter of the disc. Eyes are blueish-black in color.[2]
The disc width (DW) of male longheaded eagle rays range in size from 233-543 millimeters. Females have a disc width of approximately 243-578 millimeters. The smallest free-swimming specimen observed was 233 mm. In Northeast India, two specimens measuring 790 and 830 mm DW were recorded. A specimen collected in North Kuwait measured 900 mm DW.[2]
Longheaded eagle rays have been observed in the tropical and warm temperate Indo-West Pacific, including the Western and Eastern Indian Ocean, Western Central and Northwest Pacific Ocean, the Red Sea, and the Japan Sea. They are native to China, India, Indonesian, Pakistan, and Japan.[1]
The longheaded eagle ray inhabits coastal shallow waters on the interior continental shelf. They typically inhabit brackish waters and tropical and subtropical estuarine environments.[2] Longheaded eagle rays are benthopelagic, meaning they live and feed near or on the ocean floor. They consume crustaceans, cephalopods, echinoderms, and small bony fish. Using their shovel-shaped snout, they can excavate mud and sand when hunting for benthic invertebrates. Their dentition and papillae allow them to crush prey and separate shell from flesh before consumption.
Due to the over-exploitation of other fish and marine organisms in coastal habitats, longheaded eagle rays are classified as endangered on the IUCN red list. Commercial fisheries that net and trawl in these habitats will often inadvertently catch longheaded eagle rays but will seldom release them back into their environment. By-catch will often be discarded or sold at local fish markets.[2] Additionally, because longheaded eagle rays are so common in estuarine habitats, they are particularly susceptible to the anthropogenic pollutants - toxic chemicals, heavy metals, and pathogens - that accumulate there as a result of discarded by-products of civilization. Estuaries are also subject to large-scale construction activities like damming, dredging, filling, and draining, resulting in direct and immediate habitat loss. Another reason the longheaded eagle ray is a concern to conservationist in their low fecundity. Similar to other Myliobatid rays, longheaded eagle rays produce small litters, ranging from 1-4 pups, which typically reach sexual maturity at 4–6 years old.
{{cite journal}}: CS1 maint: multiple names: authors list (link) The longheaded eagle ray (Aetobatus flagellum) is a species of eagle ray in the family Myliobatidae. The longheaded eagle ray, like other members of the genus Aetobatus, is characteristically different from other genera of eagle rays, distinguished by their notched nasal curtain; complete, singular set of upper and lower teeth; and v-shaped teeth in the lower jaw. It is found in the tropical and warm temperate Indo-West Pacific. It formerly included populations in the northwest Pacific, but these were recognized as a separate species, Aetobatus narutobiei, in 2013. Longheaded eagle rays are benthopelagic fishes that feed on crustaceans, cephalopods, echinoderms, and small bony fishes. It is a poorly known species, but generally uncommon and considered endangered by the IUCN.
Aetobatus flagellum Aetobatus generoko animalia da. Arrainen barruko Myliobatidae familian sailkatzen da.
Aetobatus flagellum Aetobatus generoko animalia da. Arrainen barruko Myliobatidae familian sailkatzen da.
Aetobatus flagellum is een vissensoort uit de familie van de adelaarsroggen (Myliobatidae).[1] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1801 door Marcus Elieser Bloch en Johann Gottlob Schneider.
Bronnen, noten en/of referenties
Cá ó không chấm (tên khoa học Aetobatus flagellum) là một loài cá thuộc họ Myliobatidae. Nó được tìm thấy ở Trung Quốc, Ấn Độ, Indonesia và Pakistan.
Loài này đang bị đe dọa.
Cá ó không chấm (tên khoa học Aetobatus flagellum) là một loài cá thuộc họ Myliobatidae. Nó được tìm thấy ở Trung Quốc, Ấn Độ, Indonesia và Pakistan.
Loài này đang bị đe dọa.
Грудные плавники этих скатов срастаются с головой, образуя ромбовидный плоский диск, ширина которого превышает длину, края плавников имеют форму заострённых («крыльев»). Характерная форма треугольного плоского рыла, образованного сросшимися передними краями грудных плавников, напоминает утиный нос[6]. У взрослых самцов рыло длиннее. Голова удлинённая. Тонкий хвост намного длиннее диска. Позади глаз расположены брызгальца. На вентральной поверхности диска имеются 5 пар жаберных щелей, рот и ноздри. Брюшные плавники небольшие, вытянутые и закруглённые. Кнутовидный, сильно утончающийся к кончику хвост в 1,22—2,81 раз превышает ширину диска. На дорсальной поверхности у основания хвоста расположены несколько шипов, длина которых составляет 6,2—16,2 % ширины диска. Нижние зубы имеют V-образную форму. Окраска дорсальной поверхности диска ровного коричневого цвета. Вентральная поверхность диска белая. Количество лучей грудных плавников 89—96, позвонков 85—91. Отличительной особенностью этих скатов является чёрный цвет, в который окрашены их мышцы[7]. Максимальная зарегистрированная ширина диска 72 см, а вес 13,9 кг[1].
Основу рациона этих скатов составляют двустворчатые моллюски, в частности Ruditapes philippinarum and Atrina pectinata. Подобно прочим хвостоколообразным Aetobatus flagellum относится к яйцеживородящим рыбам. Эмбрионы развиваются в утробе матери, питаясь желтком и гистотрофомruen. В помёте до 4 новорождённых. Самки крупнее и живут в целом дольше. Максимальная продолжительность самцов и самок по оценкам составляет 9 и 19 лет[7].
Aetobatus flagellum не являются объектом целевого лова из-за небольшого размера и малой численности. Они попадаются в качестве прилова при коммерческом промысле с помощью тралов, жаберных и трёхстенных сетей. В Джакарте их мясо встречается в продаже, его употребляют в пищу[1]. Вид страдает от перелова и ухудшения условий среды обитания. Международный союз охраны природы присвоил этому виду статус сохранности «Вымирающий»[2].
无斑鹞鲼（学名：Aetobatus flagellum）又名西方鴨嘴燕魟，为鹞鲼科鹞鲼属的鱼类。分布于红海、印度洋和太平洋西部之热带和温带各海区以及南海、东海等海域。该物种的模式产地在Coromandel。[1]
这是一篇關於魚類的小作品。你可以通过编辑或修订扩充其内容。 
