Smoothtail devil ray (Mobula thurstoni)

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Smoothtail devil ray at fish market
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Smoothtail devil ray fact file

Smoothtail devil ray description

KingdomAnimalia
PhylumChordata
ClassChondrichthyes
OrderRajiformes
FamilyMobulidae
GenusMobula (1)

Like other rays, the smoothtail devil ray has a distinctive disc-like body with large, triangular pectoral fins that function like ‘wings’, propelling it swiftly through the water column (2) (3) (4). The mouth is located on the underside of the head, while the front of the head is equipped with two distinctive paddle-shaped lobes that channel food towards the mouth. The moderately long tail is flattened towards the base, and lacks the barbed spine exhibited by some ray species. Above, this devil ray is dark blue to black, while the underside is white, becoming silvery towards the tips of the ‘wings’ (2) (5).

Also known as
Bentfin devil ray, lesser devil ray, smoothtail mobula, Thurston’s devil ray.
Synonyms
Mobula lucasana.
French
Mante Vampire.
Spanish
Chupa Sangre, Chupasangre, Diablo, Diablo Chupasangre, Diablo Manta, Manta, Muciélago.
Size
Max width: 1.8 m (1)
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Smoothtail devil ray biology

In common with many other mobulid species, there is a dearth of information on the natural history of the smoothtail devil ray. Based on studies in the Gulf of California, Mexico, this devil ray appears to have a highly specialised diet, with euphasiid shrimp and, to a slightly lesser extent, mysid shrimp being the main prey items. It is not known to form large schools, a behaviour exhibited by some of its close relatives, but instead is usually observed solitarily or in small groups of two to six (1) (6).

In common with many elasmobranchs, mating, birthing and juvenile life predominately take place in shallow waters. It reproduces ovoviviparously, with each female producing just a single pup per litter, which develops within an egg inside the mother's body but emerges alive after hatching. The gestation period is around 12 months (1) (6).

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Smoothtail devil ray range

The smoothtail devil ray is currently known from scattered locations in the Indian, Pacific, and Atlantic Oceans, but is probably circumglobal in tropical and sub-tropical waters (1) (5).

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Smoothtail devil ray habitat

Occurs along coastlines, to depths of less than 100 metres (1).

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Smoothtail devil ray status

Classified as Near Threatened (NT) on the IUCN Red List (1).

IUCN Red List species status – Near Threatened

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Smoothtail devil ray threats

The smoothtail devil ray is taken as both a target species and as bycatch in fisheries in Mexico, Indonesia and the Philippines, and is almost certainly landed in other countries across its range. The greatest concern is in Southeast Asia, where catches and demand are increasing, owing in particular to a rise in the value of gill-rakers in the Asian medicinal market. Given its low reproductive potential, this species is unlikely to be able to tolerate the current levels of exploitation (1).

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Smoothtail devil ray conservation

It is crucial that additional research is carried out to establish the true impact of target and non-target fisheries on the smoothtail devil ray. Unfortunately, elasmobranch fisheries are generally unmanaged in most regions within this species range. Furthermore, in some areas fishing regulations are poorly enforced, such as in the Philippines where mobulids are still being caught illegally despite a ban put in place in 1998. In the long run, the development and implementation of international management plans may be vital for the survival of the smoothtail devil ray and other mobulids (1).

View information on this species at the UNEP World Conservation Monitoring Centre.
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Find out more

To find out more about the conservation of rays and sharks, see:

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Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
arkive@wildscreen.org.uk

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Glossary

Bycatch
In the fishing industry, the part of the catch made up of non-target species.
Elasmobranch
Subclass of cartilaginous fish that includes sharks, skates and rays.
Gill-rakers
A series of bony, comb-like projections located along the front edge of the gill arch.
Mobulid
Species within the Modbulidae family
Ovoviviparously
Ovovivipary is a method of reproduction whereby the egg shell is weakly formed and young hatch inside the female; they are nourished by their yolk sac and then ‘born' live.
Pectoral fins
The pair of fins that are found one on each side of the body just behind the gills. They are generally used for balancing and braking.
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References

  1. IUCN Red List (June, 2009)
    http://www.iucnredlist.org/
  2. Allen, G.R. and Robertson, D.R. (1994) Fishes of the tropical eastern Pacific. Crawford House Press, Bathhurst, UK.
  3. Burnie, D. (2001) Animal. Dorling Kindersley, London.
  4. Campbell, A. and Dawes, J. (2004) Encyclopedia of Underwater Life. Oxford University Press, Oxford.
  5. Notarbartolo-di-Sciara, G. (1987) A revisionary study of the genus Mobula, Rafinesque, 1810 (Chondrichthyes: Mobulidae) with the description of a new species. Zoological Journal of the Linnean Society, 91: 1 - 91.
  6. Notobartolo-di-Sciara, G. (1987) Natural history of the rays of the genus Mobula in the Gulf of California. Fishery Bulletin, 86(1): 45 - 66.
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Image credit

Smoothtail devil ray at fish market  
Smoothtail devil ray at fish market

© Guy Stevens / Manta Trust

Manta Trust
Catemwood House
Corscombe
Dorchester
Dorset
DT2 0NT
United Kingdom
info@mantatrust.org
http://www.mantatrust.org

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