Overview
Comprehensive Description
Biology
A little-known inshore shark (Ref. 13567). Viviparous (Ref. 50449). Taken in fisheries where it occurs (Ref. 13567).
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Compagno, L.J.V. 1984 FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Rome: FAO. (Ref. 244)
http://www.fishbase.org/references/FBRefSummary.php?id=244&speccode=763
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Distribution
Western Pacific: Japan to Viet Nam, including Hong Kong and Taiwan. Report of a record from off Madagascar may be an undescribed Paragaleus which has just recently been collected.
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Compagno, L.J.V. 1984 FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Rome: FAO. (Ref. 244)
http://www.fishbase.org/references/FBRefSummary.php?id=244&speccode=763
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Range Description
Northwest and western central Pacific: Thailand, Viet Nam, southern China (off Hong Kong), Taiwan, Japan (Compagno in prep, White et al. 2006). Recent investigation suggests that records of this species from Malaysian Borneo and Indonesia refer to a similar, but distinct species.
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Physical Description
Morphology
Dorsal spines (total): 0; Dorsal soft rays (total): 0; Analspines: 0; Analsoft rays: 0
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Compagno, L.J.V. 1998 Hemigaleidae. Weasel sharks. p. 1305-1311. In K.E. Carpenter and V.H. Niem (eds.) FAO identification guide for fishery purposes. The Living Marine Resources of the Western Central Pacific. FAO, Rome. (Ref. 13567)
http://www.fishbase.org/references/FBRefSummary.php?id=13567&speccode=5896
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Size
Max. size
88.0 cm TL (male/unsexed; (Ref. 244))
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Compagno, L.J.V. 1984 FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Rome: FAO. (Ref. 244)
http://www.fishbase.org/references/FBRefSummary.php?id=244&speccode=763
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Diagnostic Description
Grey or grey-brown above, light below; no prominent markings on body and fins (Ref. 13567).
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Compagno, L.J.V. 1998 Hemigaleidae. Weasel sharks. p. 1305-1311. In K.E. Carpenter and V.H. Niem (eds.) FAO identification guide for fishery purposes. The Living Marine Resources of the Western Central Pacific. FAO, Rome. (Ref. 13567)
http://www.fishbase.org/references/FBRefSummary.php?id=13567&speccode=5896
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Ecology
Habitat
Habitat and Ecology
Habitat and Ecology
Systems
This is an inshore species but its depth range has not been reported (Compagno et al. 2005). Virtually nothing is known about the biology of this species.
Systems
- Marine
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Life History and Behavior
Life Cycle
Viviparous, placental (Ref. 50449). Distinct pairing with embrace (Ref. 205).
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Breder, C.M. and D.E. Rosen 1966 Modes of reproduction in fishes. T.F.H. Publications, Neptune City, New Jersey. 941 p. (Ref. 205)
http://www.fishbase.org/references/FBRefSummary.php?id=205&speccode=1256
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Molecular Biology and Genetics
Molecular Biology
Statistics of barcoding coverage: Paragaleus tengi
Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 4
Species With Barcodes: 1
Public Records: 0
Specimens with Barcodes: 4
Species With Barcodes: 1
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Conservation
Conservation Status
IUCN Red List Assessment
Red List Category
DD
Data Deficient
Red List Criteria
Version
3.1
Year Assessed
2009
Assessor/s
Ebert, D.A., Fahmi & White, W.T.
Reviewer/s
Valenti, S.V. & Fowler, S.L. (Shark Red List Authority)
Contributor/s
Justification
The Straight-tooth Weasel Shark (Paragaleus tengi) is an inshore, small shark found from Japan to southern China in the western Pacific. It reaches about 92 cm in length, is viviparous and gives birth to litters of two pups, but little else is known of its biology. This species is taken in small numbers as bycatch in various fisheries throughout its range, but no data are available to determine population trends. Insufficient information is currently available to assess this species beyond Data Deficient. Population studies and catch monitoring needs to be undertaken.
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Trends
Population
Population
Population Trend
Nothing is currently known about the population status of this species.
Population Trend
Unknown
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Threats
Data deficient (DD)
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IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
http://www.fishbase.org/references/FBRefSummary.php?id=57073
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Major Threats
Taken as bycatch in fisheries throughout much of its range, including Hong Kong, Taiwan, Province of China, Japan (D.A. Ebert pers. obs, Compagno in prep.). It is retained and utilised for its meat and fins, but no catch or landings data are available.
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Management
Conservation Actions
Conservation Actions
There are no known conservation measures within the range of this species. Catch data are required to assess the impact of fisheries on this species throughout its range.
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Relevance to Humans and Ecosystems
Benefits
Importance
fisheries: minor commercial; price category: unknown; price reliability:
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Coppola, S.R., W. Fischer, L. Garibaldi, N. Scialabba and K.E. Carpenter 1994 SPECIESDAB: Global species database for fishery purposes. User's manual. FAO Computerized Information Series (Fisheries). No. 9. Rome, FAO. 103 p. (Ref. 171)
http://www.fishbase.org/references/FBRefSummary.php?id=171&speccode=2534
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Wikipedia
Straight-tooth weasel shark
The straight-tooth weasel shark, Paragaleus tengi, is a weasel shark of the family Hemigaleidae, found in the tropical western Pacific Ocean. Its length is up to 88 cm.
Reproduction is viviparous.
References
- Froese, Rainer, and Daniel Pauly, eds. (2006). "Paragaleus tengi" in FishBase. may 2006 version.
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