|Scientific Name:||Rhynchobatus laevis|
|Species Authority:||(Bloch & Schneider, 1801)|
|Taxonomic Notes:||Generally mistaken for Rhynchobatus djiddensis (Forsskael, 1775) across its range, and probably for R. australiae Whitley, 1939 in Australian waters.|
|Red List Category & Criteria:||Vulnerable A2bd+3bd+4bd ver 3.1|
|Assessor/s:||McAuley, R. & Compagno, L.J.V. (SSG Australia & Oceania Regional Workshop, March 2003)|
|Reviewer/s:||Kyne, P.M. & Cavanagh, R.D. (Shark Red List Authority)|
Due to its inshore occurrence off river mouths and shallow bays, Rhynchobatus laevis is subject to capture in a variety of fisheries. Flesh is sold for human consumption in Asia and the fins from large animals of this species and other members of its genus fetch exceptionally high prices, creating a significant incentive for bycatch to be retained. Although very little is known about its population status, because of its fragmented and sketchy distribution, unregulated targeted fishing in some areas and high fin value, local populations of R. laevis appear to have been significantly depleted throughout its range and are likely to continue to decline, at least until target fisheries become uneconomical. Thus the species is assessed as Vulnerable globally. Habitat destruction is also thought to pose a significant threat to R. laevis throughout much of its range.
The range of R. laevis is poorly known in northern Australia, due to confusion with R. australiae and R. djiddensis, and there may be a higher bycatch in demersal trawl fisheries than is currently understood. However, the introduction of Turtle Exclusion Devices (TEDs) in some Australian trawl fisheries and the implementation of various elasmobranch-finning prohibitions, has probably led to a recent reduction in captures by this sector, hence the Near Threatened classification in Australian waters, although the situation should be monitored due to the vulnerability of this species and the high value of its fins.
|Range Description:||A wide-ranging species first described from India that was widely mistaken for the Western Indian Ocean and Red Sea R. djiddensis across its range from Zanzibar and the Arabian Sea to the Western Pacific. The species needs to be taxonomically assessed from adequate samples from various parts of its range.|
Native:Australia; Bangladesh; China; India; Japan; Oman; Pakistan; Sri Lanka; Tanzania, United Republic of
|FAO Marine Fishing Areas:||
Indian Ocean – eastern; Indian Ocean – western; Pacific – northwest; Pacific – western central
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||Due to heavy inshore gillnet fishing, the Rhynchobatus laevis population has probably decreased in parts of India and but it?s population status elsewhere is unclear.|
|Habitat and Ecology:||Rhynchobatus laevis has a coastal distribution throughout its range, generally occurring on or close to the seabed, inshore off river mouths and in shallow bays. Very little is known about the life history characteristics of this species, however, they grow to at least 147 cm total length (TL) and possibly to 200 cm TL, reproduce ovoviviparously and feed primarily on benthic invertebrates (Compagno and Last 1999). Further research on the biology and exploitation of this species is urgently required.|
|Major Threat(s):||Rhynchobatus laevis is subject to capture in a variety of fisheries throughout its range (Compagno and Last 1999, W. White pers. comm.). Rhynchobatus laevis is fished heavily by gillnet fisheries, for example, in India. Due to its similarity in both habitat and habits with R. australiae, it is probably also vulnerable to other gear types, including trawlnets and hooks. Outside of Australia, elasmobranch fisheries throughout this species? range are generally unregulated (Chen 1996), catches are poorly recorded (Bonfil 1994) and finning is widespread. Flesh is sold for human consumption in Asia and the fins from large animals fetch exceptionally high prices. Given this species? use of semi-enclosed and near-shore habitats, habitat destruction and pollution are thought to pose a significant threat, particularly in Southern and South East Asia.|
The introduction of TEDs in trawl nets of some Australian fisheries, has significantly reduced the capture of large elasmobranchs (Brewer et al. 1998), however TEDs are not mandatory in several trawl fisheries in northern Australian and are probably not widely used in other parts of this species? range. The introduction of TEDs in other Australian trawl fisheries is highly recommended for mitigating bycatch of this and other at risk elasmobranchs.
Finning of Rhynchobatids is prohibited in some parts of Australia but there is thought be a continuing black market trade in their fins (Rose and McLoughlin 2001, McAuley unpublished data).
|Citation:||McAuley, R. & Compagno, L.J.V. (SSG Australia & Oceania Regional Workshop, March 2003) 2003. Rhynchobatus laevis. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 23 April 2014.|
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