Taxon name
Nebrius ferrugineus
(Lesson, 1831)
Uploaded by
National Red List Database
Taxonomic information
Scientific name
Nebrius ferrugineus
(Lesson, 1831)
Assessed taxon level
Species
Higher level taxonomic groupings
Vertebrates
Fishes
Family
ginglymostomatidae
Species authority
(Lesson, 1831)
Location and scope
Specific locality or subnational name or regional name
United Arab Emirates (the)
Scope (of the Assessment)
National
Countries included within the scope of the assessment
United Arab Emirates (the)
Does the assessment cover a marine EEZ area(s)?
Not_assigned
Conservation Status
Assessed as
Near Threatened
Qualifying criteria (if given)
A2cd
Criteria system used
IUCN
(see Assessment details)
Assessment rationale/justification
The Tawny Nurse Shark occurs throughout UAE coastal waters, and is presumably naturally uncommon there. This species is not targeted or valued in markets of the UAE. It is taken as bycatch in some areas of the Arabian Sea region (Sri Lanka and India), and declines have been noted. Slow life history characteristics, including low fecundity and a low annual rate of population increase causes the species to have a low capacity to recover from even moderate levels of exploitation. It is especially susceptible to exploitation (target and bycatch) in many largely unregulated gill net, longline and trawl fisheries that operate within its range outside and surrounding UAE waters. Some management measures are now in place in the Arabian Sea region, although domestic fisheries are likely to continue. Though data specifically from the UAE are not available, individuals in the UAE are a component of a larger, interconnected and migratory population that occurs broadly in the north-western Indian Ocean. It is inferred that declines reported in the Arabian Sea region are representative of its status in the UAE. Based on recorded levels of exploitation and decline in habitat quality, it is suspected to have declined by 20-30% over the past three generation lengths, or about 90 years. It is listed as Vulnerable A2cd.
Assessment details
Assessors/contributors/reviewers listed
UAE National Red List Workshop
Criteria system used
IUCN
Reference for methods given
IUCN. 2012. IUCN Red List Categories and Criteria: Version 3.1, Second edition. IUCN, Gland, Switzerland and Cambridge, UK. iv + 32pp pp. And IUCN. 2012. Guidelines for Application of IUCN Red List Criteria at Regional and National Levels: Version 4.0. Gland, Switzerland and Cambridge, UK: IUCN. iii + 41pp.
Further information
Endemism (according to assessment)
Endemic to region
Not assigned
Taxon distribution as listed in assessment
The Tawny Nurse Shark occurs throughout UAE waters (Jababo et al. 2015). Globally, it is widespread in the Indo-West Pacific.
Is there a map available in assessment?
Yes
Habitat and systems
Ecological system type
Habitat
Habitat details as listed in assessment
The Tawny Nurse Shark occurs on or near coral reefs, particularly in crevices and caves, and seagrass lagoonal habitat at depths of less than 70 m. The species reaches a maximum length of at least 320 cm total length (TL), with males maturing at 250 cm TL and females at 230-290 cm TL. This species is ovoviviparous (aplacental viviparity), giving birth to 1-4 pups per litter (Teshima et al. 1995, Compagno 2001), and size at birth is 40-80 cm TL. Generation length is estimated at 30 years based on age data from Ginglymostoma cirratum (Carrier and Luer 1990).
Threats and conservation measures listed
Threats listed in assessment
In the UAE, this species is not directly targeted by fisheries, but may be discarded as bycatch throughout the Arabian Gulf. This species is impacted by bycatch fisheries that are active elsewhere in its range. Marine habitats in the Gulf are experiencing high levels of disturbance and quickly deteriorating due to major impacts from development activities (including dredging and reclamation), desalination plants, industrial activities, habitat destruction through the removal of shallow productive areas and major shipping lanes (Sheppard et al. 2010). Corals in the UAE and Arabian Gulf have severely declined due to the increasing frequency of mass bleaching events caused by rising water temperatures, which is a consequence of climate change, as well as pervasive coastal development (Riegl et al. 2018, Burt et al. 2019).
Publication
Ralph, G.M., Stump, E., Linardich, C., Bullock, R.W., Carpenter, K.E., Allen D.J., Hilton-Taylor, C., Al Mheiri, R., and Alshamsi, O. 2021. UAE National Red List of Marine Species: Reef-building corals, cartilaginous fishes and select bony fishes. 2021. Ministry of Climate Change and Environment, Dubai, United Arab Emirates.