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NRLD - 330003 | Chiloscyllium arabicum

Assessment ID
330003
Taxon name
Chiloscyllium arabicum
Gubanov, 1980
Uploaded by
National Red List Database
Taxonomic information
Scientific name
Chiloscyllium arabicum
Gubanov, 1980
Assessed taxon level
Species
Higher level taxonomic groupings
Vertebrates
Fishes
Kingdom
Animalia
Phylum
chordata
Class
chondrichthyes
Order
orectolobiformes
Family
hemiscylliidae
Genus
Chiloscyllium
Species
arabicum
Species authority
Gubanov, 1980
Taxonomic notes and synonyms listed
This species was first described by Gubanov and Schleib (1980) but Dingerkus and DeFino (1983) described it as a separate species, Chiloscyllium confusum, without mention of C. arabicum. Compagno (1984) provisionally recognized C. arabicum but noted it was apparently very close to C. punctatum. Dingerkus and DeFino's account clearly establishes this species as separate from C. punctatum (Compagno 2001). This species has been widely misreported as C. griseum, at least in the Arabian Gulf, and the distribution of these two similar species requires clarification. There is a high need for taxonomic investigation regarding species in the genus Chiloscyllium in the Arabian Sea region (D. Ebert pers. comm. 2017).
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)
Country ISO code(s)
ARE
Does the assessment cover a marine EEZ area(s)?
Not_assigned
Conservation Status
Assessed as
Near Threatened
Abbreviated status
NT
Qualifying criteria (if given)
A2cd+3cd
Criteria system used
IUCN

(see Assessment details)

Assessment rationale/justification
The Arabian Carpetshark occurs throughout UAE coastal waters, and is common in the Arabian Gulf. This species is not targeted or valued in markets of the UAE, trawling has been banned there since 1980 and recently conducted surveys frequently detected it in the area. It is not targeted in the Arabian Sea region, but appears to be a major component of bycatch in trawl (and other) fisheries, and is typically discarded due to its small size and low market value. It has a close association with coral reef and estuarine habitats, which are prone to degradation and loss in the Gulf due to coastal development and impacts to benthic communities from demersal trawling. 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 27 years. It is listed as Near Threatened, nearly meeting the thresholds for Vulnerable A2cd.
Assessment details
Year assessed
2019
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 Arabian Carpetshark occurs throughout UAE waters. Globally, it is restricted to the Arabian Sea region from the Arabian Gulf to India. Records from Oman require confirmation. Another Chiloscyllium species, which is similar to the Arabian Carpetshark and possibly undescribed, may occur in northwestern India (R.W. Jabado pers. comm. 07/02/2017).
Is there a map available in assessment?
Yes
Habitat and systems
Ecological system type
Terrestrial
Not_assigned
Freshwater
Not_assigned
Marine
Yes
Habitat
Habitat details as listed in assessment
The Arabian Carpetshark occurs in coastal waters in coral reefs, lagoons, rocky shores, muddy bottoms and mangrove estuaries from 2-100 m. This shark is less than 10 cm total length (TL) at birth, but grows to a maximum length of 80 cm TL (Weigmann 2016). Females mature at 52 cm TL and males at about 55 cm TL (Moore and Peirce 2013). The species is oviparous, with single egg cases developing in each uterus. It appears to be closely associated with coral reefs. Age data are not available, but generation length is estimated as 9 years using data from the similar-sized White-spotted Bambooshark (C. plagiosum) (Chen et al. 2007).
Threats and conservation measures listed
Threats listed in assessment
Information pertaining to threats specific to the UAE are unavailable. This species is impacted by target (for fins and their valuable meat) and bycatch fisheries that are active elsewhere in its range. The Arabian Carpetshark is known to have close association with coral reef habitats, which are particularly prone to anthropogenic degradation and the effects of climate change (Carpenter et al. 2008, Normile 2016). In the Gulf, habitat degradation threats include impacts from the damming of the Tigris-Euphrates river system in Turkey and draining of the Iraqi marshes (Al-Yamani et al. 2007), chronic and acute (e.g., war-related) releases of oil, rapid large-scale coastal development (e.g., megastructures in the UAE), and disturbance of benthic communities due to demersal trawling. Coastal land reclamation has accelerated in this area in recent years and, as a result, coastal reefs and other habitat have been destroyed. This has also resulted in the almost total loss of mangrove areas around Bahrain (Morgan 2006a). High levels of polycyclic aromatic hydrocarbons (PAHs) and benzo [a] pyrene have been reported from this species in Kuwait (Al-Hassan et al. 2000). 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.