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Squatina legnota

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA CHONDRICHTHYES SQUATINIFORMES SQUATINIDAE

Scientific Name: Squatina legnota
Species Authority: Last & White, 2008
Taxonomic Notes: Referred to as Squatina sp. 1 in White et al. (2006).

Assessment Information [top]

Red List Category & Criteria: Data Deficient ver 3.1
Year Published: 2009
Date Assessed: 2008-12-01
Assessor(s): Valenti, S.V. & White, W.
Reviewer(s): Simpfendorfer, C. & Fowler, S.L. (Shark Red List Authority)
Justification:
Squatina legnota is a moderately large-bodied angel shark, known only from few specimens collected at fish landing sites in southern Indonesia. Although no detailed depth information is available, based on the species composition of the catches including the observed specimens, it is likely a slope dwelling species. It is captured rarely by demersal longliners and is retained and utilised for its meat and fins. Deepwater fishing is relatively restricted at this stage in Indonesia, but if deepwater fisheries expand in this area in the future this assessment would need to be revisited, as many species of angel shark have proved particularly vulnerable to population depletion. More information is required on this species and further development of deepwater fisheries in Indonesia should be monitored.

Geographic Range [top]

Range Description: Eastern Indian Ocean: known from few specimens collected from four fish landings sites in southern Indonesia (Palabuhanratu in West Java (06°59' S, 106°32' E), Cilacap in Central Java (07°44' S, 109°00' E), Kedonganan in Bali (08°45' S, 115°10' E), and Tanjung Luar in Lombok (08°48' S, 116°28' E)) (Last and White 2008).
Countries:
Native:
Indonesia (Jawa)
FAO Marine Fishing Areas:
Native:
Indian Ocean – eastern
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Known from few specimens (Last and White 2008).
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: This species is demersal, presumably occurring in deeper waters, probably on the continental slope. Detailed information on the depth range of this species is not available (all known specimens were collected from fish landings sites) (Last and White 2008). Presumably viviparous, with yolk-sac dependency (White et al. 2006). One female measured 47.1 cm total length (TL) and three adult males measured 125.2-134.1 cm TL (Last and White 2008).
Systems: Marine

Use and Trade [top]

Use and Trade: Utilised for its meat and fins (White et al. 2006).

Threats [top]

Major Threat(s): This species is a rare utilised bycatch of demersal longline fisheries operating in continental shelf and upper slope waters (White et al. 2006). Possibly an Indonesian endemic, as has not been recorded from adjacent regions. Only limited deepwater fishing currently takes place in Indonesia but if this was to change then this species may qualify for a threat category. Other angel shark populations (e.g. S. squatina, S. argentina) have proved particularly vulnerable to fishing pressure due to their low reproductive potential, vulnerability to trawl and gillnet fishing gear and low potential for re-colonisation (due to their sedentary habit) (Gaida 1997, ICES 2004, Morey et al. 2006, Vooren and Klippel 2005). Monitoring of the deepwater fisheries of Indonesia should be established and maintained.

Conservation Actions [top]

Conservation Actions: No measures in place.

Catch levels need to be accurately quantified and monitored. Research is also required on this species' full distribution, habitat and life-history parameters.

Citation: Valenti, S.V. & White, W. 2009. Squatina legnota. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 28 July 2014.
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