Glaucostegus granulatus | UAE National Red List of Marine Species: Reef-building corals, cartilaginous fishes and select bony fishes

Taxa
Glaucostegus granulatus | (Cuvier, 1829)
Location
Countries in Assessment
United Arab Emirates
Country ISO code(s)
ARE
Does the assessment cover a marine EEZ area(s)?
Off
Scope (Assessment)
National
Taxon
Taxonomic Group
Vertebrates
Taxonomic Group Level 2
Fishes
Assessed taxon level
Species
Taxonomic Notes
Changes to the systematics of Rhinobatos elevated the subgenus Glaucostegus to full generic status and placed this genus into a family of its own: Glaucostegidae (Compagno 2005, Last et al. 2016a). This species is often confused with Glaucostegus typus and Pacific Ocean records of G. granulatus are probably G. typus.
Taxon distribution as listed in assessment
The Sharpnose Guitarfish occurs throughout UAE waters. Globally, it is moderately widespread in the northern Indian Ocean from the Arabian Gulf to Sri Lanka.
Habitats and Ecology
Ecological system type
Terrestrial system
No
Freshwater system
No
Marine system
Yes
Habitat
Habitat details as listed in assessment
The Sharpnose Guitarfish commonly occurs in intertidal areas, but has been recorded to depths of 119 m (Compagno and Last 1999). It attains a maximum size of at least 229 cm total length (TL) (Last et al. 2016). Size at birth is believed to be around 39 cm TL (Moore et al. 2012), but little else is known of its biology. The estimation of generation length is from the maximum age (19 years) and age at maturity (7 years) taken from the growth curve provided by White et al. (2014) for the Giant Guitarfish (Glaucostegus typus), which gives an estimated generation length of 13 years.
Is there a map available in assessment?
Yes
Assessed status
Asessment status in full
Endangered
Assessment status abreviation
EN
Assessment status criteria
A2cd
Assessment rationale/justification
The Sharpnose Guitarfish occurs throughout UAE coastal waters, and may be naturally uncommon there. It likely grows slowly and matures late, which causes it to have a low productivity and be particularly susceptible to declines when experiencing exploitation. It is commonly taken in gill net and trawl fisheries, and coastal development is a significant threat. Significant declines of wedgefishes and guitarfishes have been documented in India, Pakistan and Iran. There has been a total ban on fishing for this species in UAE waters in place since 2019. Though data specifically from the UAE are not available, and it is not known how individuals occupying the UAE are connected with the broader population of the Arabian Seas region, there is no information available to suggest that its population status differs in the UAE as compared to other parts of its range in the region. Given the threats faced by this species in other parts of the Arabian Seas region, and ongoing threats from discarding and habitat loss in the UAE, it is inferred that declines reported in the Arabian Seas are representative of the status in the UAE. Based on recorded levels of exploitation and decline in habitat quality, it is suspected to have declined by 50-80% over the past three generation lengths, or about 39 years. It is listed as Endangered A2cd.
About the assessment
Assessment year
2019
Assessors/contributors/reviewers listed
UAE National Red List Workshop
Affliation of assessor(s)/contributors/reviewers listed on assessment
Government
IGO
Assessor affiliation specific
Government|IGO
Criteria system
Criteria system specifics
IUCN v3.1
Criteria system used
IUCN
Criteria Citation
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.
Endemism
Endemic to region
Not_assigned
Endemism Notes
Is an endemic?: Not_assigned
Conservation
Threats listed in assessment
In the UAE, sharks have been impacted by targeted commercial fisheries until 2014 when a ban on export of sharks was imposed (Ministry of Climate Change and Environment). Sharks continue to be impacted by artisanal and bycatch fisheries (Annual Fisheries Statistical Report for Abu Dhabi Emirate 2001-2018), though catch data are not species-specific. This species is impacted by bycatch fisheries that are active elsewhere in its range. This species may also be impacted by coastal development and habitat degradation (Moore et al. 2012), especially since juveniles utilize inshore areas as nursery grounds. Marine habitats in the Gulf are experiencing high levels of disturbance and quickly deteriorating due to major impacts from development activities (including dredging and sea-filling), desalination plants, industrial activities, habitat destruction through the removal of shallow productive areas and major shipping lanes (Sheppard et al. 2010).
Conservation Measures

Conservation measures:
Conservation measures notes:
Required conservation measures:

Scientific Name Kingdom Phylum Class Order Family Genus
Glaucostegus granulatus Animalia Chordata Chondrichthyes Rhinopristiformes Glaucostegidae Glaucostegus