Taxon name
Isurus paucus
Guitart, 1966
Uploaded by
National Red List Database
Taxonomic information
Scientific name
Isurus paucus
Guitart, 1966
Assessed taxon level
Species
Higher level taxonomic groupings
Vertebrates
Fishes
Species authority
Guitart, 1966
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)
A2d
Criteria system used
IUCN
(see Assessment details)
Assessment rationale/justification
In UAE waters, the Longfin Mako occurs only in offshore waters of the Sea of Oman. Little is known on the population of this species in UAE waters. It is caught incidentally in pelagic longline fisheries, but comprises much lower proportions of the catch than the Shortfin Mako (Isurus oxyrinchus). Most catches of this species are inadequately recorded and likely underestimated. Its apparent rarity, large size, low fecundity and continued occurrence as bycatch in fisheries is concerning. 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 20-30% over the past three generation lengths, or about 75 years. It is listed as Near Threatened, nearly meeting the thresholds for Vulnerable A2d.
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 Longfin Mako occurs in UAE waters on the Sea of Oman coast. It is excluded from the Arabian Gulf (Golani and Bogorodsky 2010). Globally, it is likely circumglobal in tropical and warm temperate waters. However, records are sporadic and the complete distribution remains unclear in part due to confusion with the more common Shortfin Mako (Isurus oxyrinchus) (Compagno 2001).
Is there a map available in assessment?
Yes
Habitat and systems
Ecological system type
Habitat
Habitat details as listed in assessment
The Longfin Mako is a poorly-known epipelagic, tropical and warm-temperate shark, and its full depth range is unknown (Compagno 2001). It attains a maximum size of at least 427 cm total length (TL). Both males and females have been reported to mature at >245 cm TL with the smallest mature male observed at 225 cm TL (Varghese et al. 2017). It is aplacental viviparous with oophagy and uterine cannibalism, and a pregnant female may have 2 to 8 embryos per litter. Size at birth is recorded at 97 to 120 cm TL (Compagno 2001). It has been suggested that females may approach land to pup (Compagno 2001). The generation length is suspected to be around 25 years, based on that of the Shortfin Mako (Isurus oxyrinchus) (Natanson et al. 2006).
Threats and conservation measures listed
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.
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.