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

Taxa
Eusphyra blochii | (Cuvier, 1816)
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
Taxon distribution as listed in assessment
The Winghead Shark occurs in UAE waters on the Sea of Oman coast (Randall 1986, Randall 1995, Environment Agency Abu Dhabi unpublished data). Records from the Arabian Gulf require verification (Ali et al. 2018). Carpenter (1997) also notes that the species' range includes the Arabian Gulf. Globally, it is widespread in the Indo-West Pacific (Last and Stevens 2009).
Habitats and Ecology
Ecological system type
Terrestrial system
No
Freshwater system
No
Marine system
Yes
Habitat
Habitat details as listed in assessment
The Winghead Shark occurs on continental shelves and is mainly found in coastal nearshore waters, including muddy river deltas and estuaries (Ebert et al. 2013). It attains a maximum size of 186 cm total length (TL) with males maturing at around 108 cm TL and females at 120 cm TL (Stevens and Lyle 1989). Females produce litters of 6-“25 (mean = 11) every year after a gestation period of 8 to 11 months with size at birth at approximately 32-47 cm TL (Compagno 1984, Stevens and Lyle 1989). This is a slow growing species that reaches maturity at 7.2 years for females and 5.5 years for males. The oldest documented maximum age is 21 years according to vertebral analysis (Stevens and Lyle 1989, Smart et al. 2013). Age at maturity was calculated from Last and Stevens (2009) female size at maturity data and Smart et al. (2013) von Bertalanffy growth estimates. Based on these data, generation length is estimated to be 14 years.
Is there a map available in assessment?
Yes
Assessed status
Asessment status in full
Critically Endangered
Assessment status abreviation
CR
Assessment status criteria
A2d
Assessment rationale/justification
In UAE waters, the Winghead Shark has only been confirmed from coastal waters on the Sea of Oman coast. No information on catch in the UAE is available, but it is taken in gill net, longline and bottom trawl fisheries in the Arabian Seas region. Anecdotal evidence from India and Pakistan suggests this species has drastically declined over the past 30-40 years. Furthermore, significant declines in landings of commercial shark species have been documented in the Arabian Sea region with other more abundant hammerhead species suspected to have declined by at least 50-80% over the past three generations. Although there are limited data on its status, other shark species in the Arabian Gulf have undergone significant declines due to exploitation. It is apparently highly migratory, and has slow life history characteristics including low fecundity and a low annual rate of population increase. Considering this, the species has 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, it is suspected to have declined by at least 80% over the past three generation lengths, or about 42 years. It is listed as Critically Endangered A2d.
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
Information pertaining to threats specific to the UAE are unavailable. This species is impacted by target and bycatch fisheries that are active elsewhere in its range.
Conservation Measures

Conservation measures:
Conservation measures notes:
Required conservation measures:

Scientific Name Kingdom Phylum Class Order Family Genus
Eusphyra blochii Animalia Chordata Chondrichthyes Carcharhiniformes Sphyrnidae Eusphyra