Photo. (c) 2019 John Nevill.
Photo. (c) 2019 John Nevill.
Scientific Name: Mobula kuhlii
English Name: Shortfin devil ray
Creole Name: Swarko
French Name: Petit diable
IUCN Red List Status: Endangered (EN)
Description:
Small devil ray with a broad and sub- terminal mouth. Anterior margins of disc straight to slightly convex. Spiracles small, circular and located below pectoral fin origins.
Base of tail quadrangular in cross-section, and no caudal spine present. Disc broad and short, length 50 to 59% of width. Denticles mostly absent. Tail whiplike and long,
greater than disc in juveniles, shorter than disc width in adults. Dorsal fin small, apex broadly rounded.
Colour. Dorsal surface purplish-brown to brown; dorsal fin plain or with a white tip. Ventral surface white except for distal portions of disc which are dusky grey.
Size:
Maturity: Born: 31-34cm DW. Maturity: males at approx. 115cm DW, females at approx.134cm DW. Maximum: attains at least 135cm DW.
Habitat and Ecology:
Found in coastal and oceanic waters. Generally found in schools, leaping out of the water. Feeds on planktonic crustaceans and possibly small fishes and cephalopods.
Ovoviviparous, with embryos feeding initially on yolk, then receiving additional nourishment from the mother by indirect absorption of uterine fluid enriched with mucus,
fat or protein through specialised structures. A single, relatively large pup is produced per litter.
Fishery Status:
This species is not protected or subject to fishery regulations despite being an appendix I species under the Convention on Migratory species to which Seychelles is party.
It is caught in gill nets. It is a periodic and occasionally numerous component of the catch.
Notes:
References:
Bizzarro, J. et al (2009). Mobula kuhlii. The IUCN Red List 2009: e.T161439A5424139. http://dx.doi.org/10.2305/IUCN.UK.2009-2.RLTS.T161439A5424139.en. (27/05/19).
Froese, R. & D. Pauly. Eds. (2018). FishBase. https://www.fishbase.de/summary/27177 (27/05/19).
Last, P.R. et al (2016). Rays of the World. CSIRO Publishing ISBN 9781501705328
Rigby, C.L. et al (2020). Mobula kuhlii. The IUCN Red List 2020: e.T161439A124485584. https://www.iucnredlist.org/species/161439/124485584fbclid=IwAR2LtUz6lLRbS4r1tEHPU7jr1fpxIJcaqk93SnNfDNRTcggeAk8Y1ADiRn0 (10/07/20)
Citation:
Nevill, J.E.G. (2019). Mobula kuhlii, Shortfin devil ray. Seychelles Seatizens. www.seatizens.sc. https://seatizens.sc/species/mobula-kuhlii-muller-henle-1841/ (Updated 29/09/21).