Red stingray

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Red stingray
Japan stingrays.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Superorder: Batoidea
Order: Myliobatiformes
Family: Dasyatidae
Genus: Hemitrygon
Species:
H. akajei
Binomial name
Hemitrygon akajei
Synonyms

The red stingray (Hemitrygon akajei) is a species of stingray in the family Dasyatidae, found in the northwestern Pacific Ocean off Japan, Korea, and China, and possibly elsewhere. It primarily inhabits shallow, sandy habitats close to shore, and has been known to enter brackish water. The red stingray has a diamond-shaped pectoral fin disc and gains its common name from its bright orange-red underside; there may also be patches of orange at various spots on its upper surface. Most individuals are no more than 1 m (3.3 ft) long.

Contents

Feeding mainly on crustaceans and bony fishes, the red stingray plays a key ecological role as an apex predator in its environment. Reproduction is aplacental viviparous, with females giving birth to 1 or up to 10 pups at a time. The red stingray is valued as food in Japan; large numbers are caught as bycatch and brought to market, which has seemingly led to a population decline in this unprolific species. As a result, the International Union for Conservation of Nature (IUCN) has assessed it as Near Threatened.

Taxonomy

The original description of the red stingray was published by Johannes Müller and Friedrich Henle in their 1841 Systematische Beschreibung der Plagiostomen under the name Trygon akajei, based on an earlier account of "Pastinaca akajei" by Heinrich Bürger. A lectotype for this species was designated by Marinus Boeseman in 1947. [2] Other common names for the red stingray include brown stingray, estuary stingaree, Japanese red stingray, Japanese stingray, red skate, whip ray, whip stingray, and yellow stingray. [3]

Distribution and habitat

The red stingray may be endemic to the northwestern Pacific Ocean; [1] it is found throughout Japanese coastal waters from Hokkaidō to Okinawa, and also occurs off Korea, mainland China and Taiwan. [4] [5] This species has been reported from as far as Thailand, the Philippines, Fiji, and Tuvalu. However, whether these records truly represent D. akajei has yet to be determined. [1] [3] The red stingray is commonly encountered in sandy areas close to shore and in bays at a depth of 10 m (33 ft) or more, [3] [5] but also inhabits muddy flats, coral reefs, and estuaries. [6]

Description

Red stingray.jpg
Red stingray2.jpg
The red stingray has orange coloration on its dorsal and ventral surfaces.

The red stingray can grow to 2 m (6.6 ft) long and 0.66 m (2.2 ft) across, though most do not exceed 1 m (3.3 ft) in length. The maximum recorded weight is 10.7 kg (24 lb). [1] [3] It has a diamond-shaped pectoral fin disc wider than long, with nearly straight front margins converging to a triangular snout. The small eyes are slightly elevated, and followed by spiracles that are almost twice as large. There is a thick flap of skin between the large nares. [7] The teeth are arranged with a quincunx pattern into a pavement-like surface. Females and juveniles have blunt teeth, while adult males have pointed, recurved teeth. [5] There is a row of 3 papillae across the floor of the mouth, sometimes with up to 2 pairs of accessory papillae alongside. [4]

The tail is whip-like and measures 1–1.5 times as long as the disc is wide. A long, serrated spine originates in the first third of the tail, and is followed by a low dorsal keel and a ventral fin fold. Young rays have smooth skin, while adults have a patch of small dermal denticles between and behind the eyes, and a row of thorns along the midline of the back. There are 1–6 tubercles in front of the tail spine, and numerous small denticles behind. This species is plain brown above, often with yellow or orange coloring before the eyes, behind the spiracles, around the disc margin, and laterally on the tail in front of the spine. The tail darkens to nearly black towards the tip and on the ventral fin fold. The underside is white with bright orange-red patches. [4] [7] The Mekong freshwater stingray (D. laosensis) is also characterized by orange ventral coloration and has some similar meristic counts to this species, but differs in disc shape, denticle coverage, and dorsal coloration. [8]

Biology and ecology

As an apex predator in nearshore demersal food webs, the red stingray plays a significant ecological role. Crustaceans are the most important component of its diet, followed by small bony fishes and then annelid worms, while molluscs are seldom consumed. In Tokyo Bay, important crustacean prey species are Crangon affinis for males, Oratosquilla ijimai for females, and Anisomysis ijimai for juveniles; the most important fish prey species is Sardinops melanostictus , followed by Conger myriaster . [5] Like other stingrays, the red stingray is aplacental viviparous. [3] During courtship, the male follows the female and bites at her pectoral fin disc, using his pointed teeth to gain a grip for copulation. [5] The litter size has been variously reported as only 1 or up to 10. [1] [6] Males mature sexually at a disc width of 35–40 cm (14–16 in), and females at a disc width of 50–55 cm (20–22 in). [5]

Known parasites of the red stingray include the tapeworms Acanthobothrium macrocephalum, [9] Rhodobothrium pulvinatum, [10] and Tetragonocephalum akajeinensis, [11] the monogeneans Dendromonocotyle akajeii and Heterocotyle chinensis, [12] [13] the leech Pterobdella amara, [14] the nematodes Porrocaecum laymani and Terranova amoyensis, [15] [16] the copepod Trebius akajeii, [17] and the pranzia larvae of the isopod Gnathia capillata. [18]

Human interactions

The venomous tail spine of the red stingray is potentially injurious to humans. [3] The Ainu once used the dried tail spine, with the toxic sheath intact, as a weapon. [19] This species is an incidental catch of commercial fisheries targeting flounder and other bottom-dwelling fishes, using bottom trawls, gillnets, set nets, and line gear. [1] It is valued as food in Japan, especially in the Tokyo Bay area where it is consumed in autumn and winter; it may be prepared hard boiled, with miso soup, or as kamaboko . [3] [5] However, the small size of the red stingray limits its economic importance. [3] Annual catches reported by Japanese fisheries have steadily declined from 20,000 tons in 1950 to varying between 3,959 and 5,388 tons from 1997 to 2004. [20] [21] Such apparent depletion, coupled with continuing heavy fishing pressure and a slow reproductive rate, have led the International Union for Conservation of Nature (IUCN) to assess this species as Near Threatened. [1]

Related Research Articles

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The thorntail stingray, black stingray, or longtail stingray is a species of stingray in the family Dasyatidae. It is found off southern Africa, Australia, and New Zealand from the intertidal zone to a depth of 440 m (1,440 ft). This bottom-dweller inhabits soft-bottomed habitats such as lagoons, estuaries, and reefs. Growing to 1.8 m (5.9 ft) across and over 200 kg (440 lb) in weight, the thorntail stingray is among the largest stingrays in the world. Uniformly dark above and light below, it has a diamond-shaped pectoral fin disc and a very long, whip-like tail with a fin fold underneath. The upper surface of the disc and the tail bear numerous stout, sharp thorns.

<span class="mw-page-title-main">Short-tail stingray</span> Species of cartilaginous fish

The short-tail stingray or smooth stingray is a common species of stingray in the family Dasyatidae. It occurs off southern Africa, typically offshore at a depth of 180–480 m (590–1,570 ft), and off southern Australia and New Zealand, from the intertidal zone to a depth of 156 m (512 ft). It is mostly bottom-dwelling in nature and can be found across a range of habitats from estuaries to reefs, but also frequently will swim into open water. One of the largest stingrays in the world, this heavy-bodied species can grow upwards of 2.1 m (6.9 ft) across and 350 kg (770 lb) in weight. Its plain-colored, diamond-shaped pectoral fin disc is characterized by a lack of dermal denticles even in adults, and white pores beside the head on either side. The body can have colors as well as dark grey or black with rows of white spots along each wing. Its tail is usually shorter than the disc and thick at the base. It is armed with large tubercles and a midline row of large thorns in front of the stinging spine which has the dorsal and ventral fin folds behind.

<span class="mw-page-title-main">Longtail stingray</span> Species of cartilaginous fish

The longtail stingray, is a species of stingray in the family Dasyatidae, found in the eastern Pacific Ocean from Baja California to Colombia. It inhabits sandy habitats down to a depth of 90 m (300 ft). Measuring up to 1.56 m (5.1 ft) across, this species has a rhomboid pectoral fin disc, a lower fin fold on the tail, and numerous dermal denticles along the back and behind the stinging spine. The longtail stingray feeds mainly on bottom-dwelling bony fishes and crustaceans. It is aplacental viviparous, with females giving birth to 1–5 young in late summer. It is caught for food, likely throughout its range, but specific fishery data is lacking.

<i>Telatrygon acutirostra</i> Species of cartilaginous fish

The sharpnose stingray is a little-known species of stingray in the family Dasyatidae, found off southern Japan and in the East China Sea. With a rounded pectoral fin disc and a long, projecting snout, T. acutirostra resembles the smaller pale-edged stingray. A number of characteristics differentiate this species from T. zugei, including larger eyes and the absence of a dorsal fin fold on the tail. The International Union for Conservation of Nature (IUCN) has assessed this species as Near Threatened, as its restricted distribution renders it vulnerable to increases in fishing pressure.

<span class="mw-page-title-main">Diamond stingray</span> Species of cartilaginous fish

The diamond stingray is a species of stingray in the family Dasyatidae. It is found in the coastal waters of the eastern Pacific Ocean from southern California to northern Chile, and around the Galápagos and Hawaiian Islands. This bottom-dweller generally inhabits sandy or muddy flats near rocky reefs and kelp forests, to a depth of 30 m (98 ft), though off Hawaii it may range considerably deeper. As its common name suggests, this species has an angular, diamond-shaped pectoral fin disc that is plain brown or gray above, with rows of tubercles along the midline and on the "shoulders". The long, whip-like tail has both dorsal and ventral fin folds, which distinguish this ray from the closely similar longtail stingray. It typically grows to 1 m (3.3 ft) across.

<span class="mw-page-title-main">Estuary stingray</span> Species of cartilaginous fish

The estuary stingray, also called the estuary stingaree or brown stingray, is a species of stingray in the family Dasyatidae. Endemic to eastern Australia, it typically inhabits shallow, mangrove-lined tidal rivers, estuaries, and bays in southern Queensland and New South Wales. This yellow-brown to olive ray grows to at least 93 cm (37 in) across. It has a diamond-shaped pectoral fin disc and a mostly smooth, whip-like tail bearing both dorsal and ventral fin folds. It can additionally be identified by its long, narrow nostrils and the row of thorns along the midline of its back.

<span class="mw-page-title-main">Mekong freshwater stingray</span> Species of cartilaginous fish

The Mekong freshwater stingray, Hemitrygon laosensis, is a species of stingray in the family Dasyatidae, restricted to the Mekong and Chao Phraya Rivers in Laos and Thailand; the occurrence in Chao Phraya is considered an introduction. Measuring up to 62 cm (24 in) across, this ray has an oval pectoral fin disc, a tail with both upper and lower fin folds, and a midline row of spine-like dermal denticles. A characteristic feature of this species is its bright orange underside. The Mekong freshwater stingray preys on invertebrates and is aplacental viviparous. It has been assessed as Endangered by the International Union for Conservation of Nature (IUCN), as it is threatened by overfishing and habitat degradation.

<span class="mw-page-title-main">Bluntnose stingray</span> Species of cartilaginous fish

The bluntnose stingray or Say's stingray is a species of stingray in the family Dasyatidae, native to the coastal waters of the western Atlantic Ocean from the U.S. state of Massachusetts to Venezuela. It is a bottom-dwelling species that prefers sandy or muddy habitats 1–10 m (3.3–32.8 ft) deep, and is migratory in the northern portion of its range. Typically growing to 78 cm (31 in) across, the bluntnose stingray is characterized by a rhomboid pectoral fin disc with broadly rounded outer corners and an obtuse-angled snout. It has a whip-like tail with both an upper keel and a lower fin fold, and a line of small tubercles along the middle of its back.

<span class="mw-page-title-main">Pale-edged stingray</span> Species of cartilaginous fish

The pale-edged stingray or sharpnose stingray 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.

<span class="mw-page-title-main">Pink whipray</span> Species of stingray in the family Dasyatidae

The pink whipray is a species of stingray in the family Dasyatidae, with a wide but ill-defined distribution in the tropical Indo-Pacific from southern Africa to Polynesia. It is a bottom dweller that generally inhabits shallow water under 70 m (230 ft) deep, in sandy areas associated with coral reefs. Individuals exhibit a high degree of fidelity to particular locations. The pink whipray has a diamond-shaped pectoral fin disc wider than long, with a broad-angled snout and a very long, whip-like tail without fin folds. It has only a few small thorns on its back and is uniform brownish to grayish pink in color, becoming much darker past the tail sting. This large ray can reach 1.8 m (5.9 ft) across and over 5 m (16 ft) long.

<span class="mw-page-title-main">Smalleye stingray</span> Species of cartilaginous fish

The smalleye stingray is a large species of stingray in the family Dasyatidae, measuring up to 2.2 m (7.2 ft) across. Rare but widely distributed, it is found in the Indo-Pacific from Mozambique to India to northern Australia. This species may be semi-pelagic in nature, inhabiting both deeper waters and shallow coastal reefs and estuaries. It is characterized by a diamond-shaped pectoral fin disc much wider than long, a tail that is broad and flattened in front of the spine but whip-like behind, and large white spots over its back.

The giant stumptail stingray, Dasyatis gigantea, is a species of stingray in the family Dasyatidae, known from only two specimens collected from the Peter the Great Bay in the Sea of Japan. This large species is characterized by rhomboid pectoral fin disc wider than long, a relatively long snout, and a short, blunt tail. The International Union for Conservation of Nature (IUCN) has listed this species as Data Deficient and recommended further study.

<span class="mw-page-title-main">Jenkins' whipray</span> Species of cartilaginous fish

The Jenkins' whipray is a species of stingray in the family Dasyatidae, with a wide distribution in the Indo-Pacific region from South Africa to the Malay Archipelago to northern Australia. This large species grows to 1.5 m (4.9 ft) across and has a broad, diamond-shaped pectoral fin disc and a whip-like tail without fin folds. It has a band of heart-shaped dermal denticles running from between the eyes to the tail on its upper surface, along with a characteristic row of large spear-like thorns along the midline. It is uniform yellowish brown above, becoming grayish on the tail past the stinging spine, and white below; there is apparently a spotted color variant that had previously been described as a different species, the dragon stingray.

The Yantai stingray, is a little-known species of stingray in the family Dasyatidae, inhabiting shallow waters in the northwestern Pacific Ocean off the coasts of China and Japan. Measuring no more than 20–30 cm (7.9–11.8 in) across, this species is characterized by its diamond-shaped pectoral fin disc wider than long, completely smooth skin, dorsal coloration of dark irregular spots on a yellowish gray-brown background, and ventral coloration of more spots on a white background with yellowish margins. One of the three most common stingrays sold for food in China, the slow-reproducing Yantai stingray faces possible overfishing and habitat degradation, and its numbers appear to be declining. The International Union for Conservation of Nature (IUCN) has assessed it as vulnerable.

<span class="mw-page-title-main">Blackish stingray</span> Species of cartilaginous fish

The blackish stingray is a little-known species of stingray in the family Dasyatidae, found in the northwestern Pacific Ocean off the coasts of mainland China and Taiwan. This species reaches 38 cm (15 in) across and has a chocolate brown, diamond-shaped pectoral fin disc nearly as long as wide. Its whip-like tail bears three large tubercles in front of the stinging spine, as well as both dorsal and ventral fin folds with the ventral fold half as long as the disc. Caught as bycatch in bottom trawls, the blackish stingray is frequently marketed as food in China.

<span class="mw-page-title-main">Chinese stingray</span> Species of cartilaginous fish

The Chinese stingray is a little-known species of stingray in the family Dasyatidae, found in the northwestern Pacific Ocean off the coasts of China and Korea. This species is characterized by a band of small dermal denticles running along the upper surface of its diamond-shaped pectoral fin disc, from the snout to the tail spine. It can grow to 40 cm (16 in) across and 82 cm (32 in) long. The Chinese stingray is taken incidentally in bottom trawls and is one of the three most commonly marketed stingrays in China. At present, the International Union for Conservation of Nature (IUCN) has assessed its conservation status as endangered.

<span class="mw-page-title-main">Pitted stingray</span> Species of cartilaginous fish

The pitted stingray is a species of stingray in the family Dasyatidae, endemic to the waters around Japan and the Sea of Japan. It typically found near the coast at depths of 40–60 m (130–200 ft), but may also venture into the open sea. Measuring up to 2 m (6.6 ft) across, the pitted stingray has a diamond-shaped pectoral fin disc with a characteristic W-shaped groove on the underside. The total length including the tail has a record of 2.8 m (9.2 ft). Other identifying characteristics of this species include its dark gray dorsal coloration with small white spots, and the presence of dorsal tubercles in adults. Pitted stingrays are caught as bycatch in coastal fisheries and brought to market. The International Union for Conservation of Nature (IUCN) does not yet have sufficient data to assess this species beyond Data Deficient. This species is now regarded as a population of the Short-tail stingray.

<span class="mw-page-title-main">Daisy stingray</span> Species of cartilaginous fish

The daisy stingray, Fontitrygon margarita, is a little-known species of stingray in the family Dasyatidae, found in shallow waters along the coast of West Africa. This species typically grows to 60 cm (24 in) across and has a rounded pectoral fin disc and a wide band of dermal denticles over its back. It is characterized by a greatly enlarged, nacreous denticle in the middle of its back called a "pearl spine"; this feature is shared with the similar but much smaller pearl stingray, which has often been confused with this species. The daisy stingray feeds mainly on crustaceans and exhibits aplacental viviparity, with litters of 1–4 young. Heavily pressured by fisheries and possibly habitat degradation, this once-common species is declining and has been assessed as Vulnerable by the International Union for Conservation of Nature (IUCN).

<span class="mw-page-title-main">Bennett's stingray</span> Species of cartilaginous fish

The Bennett's stingray or frilltailed stingray is a little-known species of stingray in the family Dasyatidae, with a wide but ill-defined distribution in the Indian and Pacific Oceans. This species is characterized by a rhomboid, yellow-brown pectoral fin disc with a fairly long snout, and an extremely long tail with a correspondingly long ventral fin fold. It measures up to 50 cm (20 in) across. It feeds on fish, and is aplacental viviparous. It is likely caught by demersal fisheries.

<span class="mw-page-title-main">Dwarf black stingray</span> Species of cartilaginous fish

The dwarf black stingray is a little-known species of stingray in the family Dasyatidae, found off northwestern Australia and perhaps throughout Southeast Asia at depths of 60–185 m (197–607 ft). Growing to a width of 51 cm (20 in), this species is characterized by an angular, diamond-shaped pectoral fin disc with a short row of spear-like thorns along the midline of the back and few dermal denticles elsewhere. Its tail bears a long fin fold along the bottom and a much shorter ridge along the top, both past the stinging spine. Plain brownish in color above, this ray can range from light to very dark. In some parts of its range, this species is occasionally caught incidentally by fisheries and sold for meat.

References

  1. 1 2 3 4 5 6 7 Rigby, C.L.; Walls, R.H.L.; Derrick, D.; Dyldin, Y.V.; Herman, K.; Ishihara, H.; Jeong, C.-H.; Semba, Y.; Tanaka, S.; Volvenko, I.V.; Yamaguchi, A. (2021). "Hemitrygon akajei". IUCN Red List of Threatened Species . 2021: e.T60148A104113935. doi: 10.2305/IUCN.UK.2021-1.RLTS.T60148A104113935.en . Retrieved 17 November 2021.
  2. ↑ Catalog of Fishes (Online Version). California Academy of Sciences. Retrieved on December 4, 2009.
  3. 1 2 3 4 5 6 7 8 Froese, Rainer; Pauly, Daniel (eds.). "Dasyatis akajei". Fishbase . December 2009 version.
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  5. 1 2 3 4 5 6 7 Taniuchi, T. & M. Shimizu (January 1993). "Dental sexual dimorphism and food habits in the stingray Dasyatis akajei from Tokyo Bay, Japan". Bulletin of the Japanese Society of Scientific Fisheries. 59 (1): 53–60. doi: 10.2331/suisan.59.53 .
  6. 1 2 Michael, S.W. (1993). Reef Sharks & Rays of the World. Sea Challengers. p. 83. ISBN   0-930118-18-9.
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  8. ↑ Roberts, T.R. & J. Karnasuta (1987). "Dasyatis zaosensis, a new whiptailed stingray (family Dasyatidae), from the Mekong River of Laos and Thailand". Environmental Biology of Fishes. 20 (3): 161–167. doi:10.1007/BF00004951. S2CID   29725251.
  9. ↑ Wang Y.H. & Yang W.C. (July 2001). "Two new species of Acanthobothrium from marine fishes in Xiamen, Fujian, China (Cestoda: Tetraphyllidea: Onchobothridae)". Journal of Xiamen University Natural Science. 40 (4 Supplement Sum 163): 943–948.
  10. ↑ Wang Y.H.; Yang W.C.; Liu S.F. & Li L.W. (July 2003). "A new genus record of Phyllobothriidae from marine fish Dasyatis akajei in China". Journal of Xiamen University Natural Science. 42 (4): 542–544.
  11. ↑ Yang W.C.; Liu G.C. & Lin Y.G. (January 1995). "Two new species of cestode (Lecanicephalidea: Lecanicephalidae) from marine fishes in Xiamen, south Fujian, P.R. of China". Journal of Xiamen University Natural Science. 34 (1 Supplement Sum 124): 109–112.
  12. ↑ Ho, J. & P.S. Perkins (1980). "Monogenea from fishes of the Sea of Japan part 1: Order Monopisthocotylea". Annual Report of the Sado Marine Biological Station Niigata University. Supplement 10: 1–10.
  13. ↑ Timofeeva, T.A. (1983). "New representatives of monocotylids (Monogenea: Monocotylidae) from cartilaginous fishes of the South China and Yellow Seas". Trudy Zoologicheskogo Instituta. 121: 35–47.
  14. ↑ Burreson, E.M. (August 2006). "A redescription of the fish leech Pterobdella amara (=Rhopalobdella japonica) (Hirudinida: Piscicolidae) based on specimens from the type locality in India and from Australia". Journal of Parasitology. 92 (4): 677–681. doi:10.1645/GE-802R.1. PMID   16995381. S2CID   21573250.
  15. ↑ Mozgovoi, A.A. (1950). "Contribution to the Anisakid fauna of fishes and reptiles". Trud. Gel'mint. Lab. 3: 102–118.
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  17. ↑ Deets, G.B. & M. Dojiri (1989). "Three species of Trebius Kroyer, 1838 (Copepoda: Siphonostomatoida) parasitic on Pacific elasmobranchs". Systematic Parasitology. 13 (2): 81–101. doi:10.1007/BF00015217. S2CID   45745111.
  18. ↑ Nunomura, N. & Y. Honma (July 2004). "Gnathia capillata, a new species of the genus Gnathia (Crustacea, Isopoda) from Sado Island, the Sea of Japan". Contributions from the Biological Laboratory Kyoto University. 29 (4): 343–349.
  19. ↑ Blaxter, J.H.S.; F.S. Russell, eds. (1984). Advances in Marine Biology, Volume 21. Academic Press. p. 62. ISBN   0-12-026121-9.
  20. ↑ FAO Yearbook [of] Fishery Statistics: Capture Production 2004, Volume 98. Food and Agriculture Organization of the United Nations. 2006. p. 76. ISBN   92-5-005515-3.
  21. ↑ Vannuccini, S. (1999). Shark Utilization, Marketing and Trade. Food and Agriculture Organization of the United Nations. pp. 21–23. ISBN   92-5-104361-2.
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