Estuary stingray

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Estuary stingray
Dasyatis fluviorum csiro-nfc.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. fluviorum
Binomial name
Hemitrygon fluviorum
(J. D. Ogilby, 1908)
Dasyatis fluviorum rangemap.png
Geographic range [2]

The estuary stingray (Hemitrygon fluviorum), 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.

Contents

While the estuary stingray has gained infamy for consuming farmed shellfish such as oysters, it mainly feeds on crustaceans and polychaete worms. It is aplacental viviparous, with the unborn young sustained to term by maternal histotroph ("uterine milk"). Once common, this species has apparently declined across much of its range, likely from a combination of habitat degradation, mortality from commercial and recreational fishing, and persecution by shellfish farmers. As a result, the International Union for Conservation of Nature (IUCN) has assessed it as Near Threatened.

Taxonomy

The first reference to the estuary stingray in scientific literature was probably a record by 19th-century English naturalist William Saville-Kent of a " Trygon pastinaca " feeding on oysters in a Queensland estuary. [3] This species was formally described by Australian ichthyologist James Douglas Ogilby in a 1908 volume of Proceedings of the Royal Society of Queensland , based on a specimen collected from the Brisbane River. The specific epithet fluviorum means "of the rivers" in Latin. [4]

Description

The estuary stingray has a diamond-shaped pectoral fin disc about as wide as long, with gently convex anterior margins and broadly rounded outer corners. The snout is wide and triangular, and tapers to a point. The small, widely spaced eyes are immediately followed by the spiracles. Between the long and narrow nostrils, there is a short and broad "skirt" of skin with a weakly fringed posterior margin. The small, bow-shaped mouth is surrounded by deep furrows and contains a row of five papillae across the floor, with the outermost pair tiny and set apart from the others. The teeth are small and arranged into pavement-like surfaces. There are five pairs of gill slits beneath the disc. The pelvic fins are relatively large. [2]

The tail measures twice as long as the disc, and is broad and flattened at the base. On its upper surface is at least one, often two serrated stinging spines. Past the spines, the tail quickly tapers to become whip-like and bears a well-developed keel above and a long, low fin fold beneath. There are wide patches of small dermal denticles with flattened crowns between the eyes and over the middle of the back, along with a midline row of enlarged thorns that become progressively longer until they reach the base of the sting. Aside from the thorns at the base, the tail is smooth. This species is yellowish to greenish brown above, lightening towards the disc margins and darkening past the tail spine, and white below. It grows to at least 93 cm (37 in) across, and possibly reaches a width of 1.2 m (3.9 ft). [2] Its maximum recorded weight is 6.1 kg (13 lb). [5]

Distribution and habitat

The estuary stingray inhabits shallow waters with fine sediment. Brendos stingray.jpg
The estuary stingray inhabits shallow waters with fine sediment.

The range of the estuary stingray spans approximately 1,700 km (1,100 mi) along Australia's eastern coast, from Repulse Bay in Queensland to the Hacking River in New South Wales. It is most common in southern Queensland, including in Hervey Bay and Moreton Bay. [6] This species was formerly suspected to have disappeared from Botany Bay and Port Jackson in the 1880s, [7] but recent observations have shown this is not the case. Additional species records from the Cape York Peninsula, Northern Territory, New Guinea, and the South China Sea probably represent misidentifications of other stingrays, primarily the freshwater whipray (Himantura dalyensis) and the Merauke stingray (D. longicauda). [2] [6] [8]

The habitat requirements of the estuary stingray appear to be rather stringent, as significant numbers are only found at particular locations. [7] It prefers tidal rivers and the intertidal flats of estuaries and bays, which are lined with mangroves and have sandy to muddy bottoms. This species is rarely found outside these sheltered areas, though it has been recorded to a depth of 28 m (92 ft) in offshore waters. It inhabits marine and brackish waters, and may be able to tolerate fresh water as well as it has been known to swim upriver beyond the limit of high tide. Surface water temperatures within its range vary from 24–29 °C (75–84 °F) in the north to 17–23 °C (63–73 °F) in the south. [6] This species seems to segregate by size and sex. [9]

Biology and ecology

The soldier crab is an important prey species of the estuary stingray. Aus soldier Crab.jpg
The soldier crab is an important prey species of the estuary stingray.

Despite its reputation for preying voraciously on oysters and other farmed shellfish, the estuary stingray's diet in fact consists mainly of crustaceans and polychaete worms. [7] [2] In Moreton Bay, an important prey species is the soldier crab (Mictyris longicarpus). This ray has been observed entering mudflats with the rising tide to forage for food. [7] Known parasites of the estuary stingray include the tapeworm Shirleyrhynchus aetobatidis , [10] the nematode Echinocephalus overstreeti [11] and the monogeneans Heterocotyle chin , [12] Empruthotrema dasyatidis [13] and Neoentobdella cribbi . [14]

Like other stingrays, the estuary stingray exhibits aplacental viviparity, with the developing embryos sustained initially by yolk and later by histotroph ("uterine milk") produced by the mother. Females probably produce offspring every year. [15] Courtship, in which the male follows the female and bites her disc, has been observed at night in water approximately 80 cm (31 in) deep in Hays Inlet from July to October. [9] The newborns measure around 11 cm (4.3 in) across and 35 cm (14 in) long. [2] Young rays have been caught in the Nerang and Macleay Rivers and in Hays Inlet; such fresh or brackish environments may serve as nurseries. [9] Males mature at around 41 cm (16 in) across and seven years of age, and females mature at around 63 cm (25 in) across and 13 years of age. [15] This disparity in maturation size between the sexes is among the widest known for stingrays. [9] The maximum lifespan is estimated to be 16 years for males and 23 years for females. [15]

Human interactions

Historical and anecdotal evidence strongly suggest that the once-abundant estuary stingray has declined substantially across its range. [7] Although it is not commercially utilized, it faces a number of other threats. This species is captured incidentally by commercial bottom trawl and gillnet fisheries; bycatch mortality is exacerbated by the practice of "spiking", in which the ray's cranium is pierced with a metal bar or sharpened stick so as to move it. It is also readily caught, and often killed, by recreational anglers. [7] Surveys in Moreton Bay have found fishing-related effects, such as embedded hooks and mutilated tails, in over 10% of the population. [15] Habitat degradation is another major threat to the estuary stingray, especially given its habitat specificity. Its range encompasses some of the most urbanized areas in Australia, where there is extensive land reclamation, water pollution, and construction of flood mitigation barriers on rivers. [6] Finally, this ray's reputation for damaging shellfish has led to persecution by commercial shellfish farmers. [7]

The estuary stingray's diminished population and susceptibility to multiple threats have led the International Union for Conservation of Nature (IUCN) to assess it as Near Threatened. [7] Demographic modelling has shown that it is likely to become Endangered without intervention. [15] Several Marine Protected Areas (MPAs) are located within its range, but at present they lack adequate protection from fishing. As this ray remains locally abundant in Hervey Bay and parts of Moreton Bay, these areas may become important centers for preserving the species. [7] The Queensland government has listed the estuary stingray on the Back on Track species prioritisation framework, to facilitate the development of conservation measures. [16]

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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">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">Brown whipray</span> Species of cartilaginous fish

The brown whipray is a species of stingray in the family Dasyatidae, common in inshore, muddy habitats along the northern coast of Australia. It has often been confused in literature for the honeycomb stingray and the black-spotted whipray, which until recently was thought to be the same species. This species has an angular, diamond-shaped pectoral fin disc and a long, very thin tail without fin folds. It is plain brown above, sometimes with white dots or flecks near the edge of the disc, and white below; the tail is dark all over, with alternating dark and light bands near the tip. The maximum recorded disc width is 74 cm (29 in).

References

  1. ↑ Rigby, C.L.; Derrick, D. (2021). "Hemitrygon fluviorum". IUCN Red List of Threatened Species . 2021: e.T41797A68618306. doi: 10.2305/IUCN.UK.2021-2.RLTS.T41797A68618306.en . Retrieved 14 November 2021.
  2. 1 2 3 4 5 6 Last, P.R.; Stevens, J.D. (2009). Sharks and Rays of Australia (second ed.). Harvard University Press. pp. 435–436. ISBN   978-0-674-03411-2.
  3. ↑ Last, P.R. (2002). "Freshwater and Estuarine Elasmobranchs of Australia". In Fowler, S.L.; T.M. Reed; F.A. Dipper (eds.). Elasmobranch Biodiversity, Conservation and Management. IUCN. pp. 185–193. ISBN   978-2-8317-0650-4.
  4. ↑ Ogilby, J.D. (25 August 1908). "On new genera and species of fishes". Proceedings of the Royal Society of Queensland. 21: 1–26.
  5. ↑ Froese, Rainer; Pauly, Daniel (eds.) (2010). "Dasyatis fluviorum" in FishBase. January 2010 version.
  6. 1 2 3 4 Pierce, S.J.; Bennett, M.B. (15 March 2010). "Distribution of the estuary stingray (Dasyatis fluviorum) in Australia". Memoirs of the Queensland Museum. 55 (1): 89–97.
  7. 1 2 3 4 5 6 7 8 9 Kyne, P.M.; Pollard, D.A.; Bennett, M.B. (2016). "Hemitrygon fluviorum". IUCN Red List of Threatened Species . 2016: e.T41797A104116059. doi: 10.2305/IUCN.UK.2016-3.RLTS.T41797A104116059.en .
  8. ↑ Last, P.R.; White, W.T. (2013). "Two new stingrays (Chondrichthyes: Dasyatidae) from the eastern Indonesian Archipelago" (PDF). Zootaxa. 3722 (1): 1–21. doi:10.11646/zootaxa.3722.1.1. PMID   26171511.
  9. 1 2 3 4 Pierce, S.J.; Scott-Holland, T.B.; Bennett, M.B. (April 2011). "Community Composition of Elasmobranch Fishes Utilizing Intertidal Sand Flats in Moreton Bay, Queensland, Australia". Pacific Science. 65 (2): 235–247. doi:10.2984/65.2.235. hdl: 10125/23222 . S2CID   38462666.
  10. ↑ Beveridge, I.; Campbell, R.A. (January 1998). "Reexamination of the trypanorhynch cestode collections of A.E. Shipley, J. Hornell and T. Southwell, with the erection of a new genus, Trygonicola, and redescriptions of seven species". Systematic Parasitology. 39 (1): 1–34. doi:10.1023/A:1005852507995. S2CID   24232674.
  11. ↑ Moravec, F.; Justine, J.L. (2006). "Three nematode species from elasmobranchs off New Caledonia" (PDF). Systematic Parasitology. 64 (2): 131–145. doi:10.1007/s11230-006-9034-x. PMID   16773474. S2CID   2436786. Archived from the original (PDF) on 30 September 2011.
  12. ↑ Chisholm, L.A.; Whittington, I.D. (November 1996). "A revision of Heterocotyle (Monogenea: Monocotylidae) with a description of Heterocotyle capricornensis n. sp. from Himantura fai (Dasyatididae) from Heron Island, Great Barrier Reef, Australia". International Journal for Parasitology. 26 (11): 1169–1190. doi:10.1016/S0020-7519(96)00113-0. PMID   9024861.
  13. ↑ Whittington, I.D.; Kearn, G.C. (July 1992). "Empruthotrema dasyatidis n. sp. (Monogenea: Monocotylidae) from the olfactory sacs of Dasyatis fluviorum (Rajiformes: Dasyatidae) from Moreton Bay, Queensland". Systematic Parasitology. 22 (3): 159–165. doi:10.1007/BF00009663. S2CID   26375148.
  14. ↑ Whittington, I.D.; G.C. Kearn (2009). "Two new species of Neoentobdella (Monogenea: Capsalidae: Entobdellinae) from the skin of Australian stingrays (Dasyatidae)". Folia Parasitologica. 56 (1): 29–35. doi: 10.14411/fp.2009.005 . PMID   19391329. Open Access logo PLoS transparent.svg
  15. 1 2 3 4 5 Pierce, S.J.; Bennett, M.B. (2010). "Destined to decline? Intrinsic susceptibility of the threatened estuary stingray to anthropogenic impacts". Marine and Freshwater Research. 61 (12): 1468–1481. CiteSeerX   10.1.1.1021.6851 . doi:10.1071/MF10073.
  16. ↑ Estuary stingray Archived 17 March 2011 at the Wayback Machine (31 August 2007). Queensland Department of Environment and Resource Management. Retrieved 6 November 2011.

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