Overview

Comprehensive Description

Biology

Found on the continental slopes. Oviparous, with one egg per oviduct laid at a time. Sexual dimorphism in adults unusually well-developed.
  • 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)
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Distribution

Range Description

Western Central Atlantic: Known from Dominican Republic, Cuba, the northern Gulf of Mexico (Florida to Mississippi, USA), Mexico, Honduras, Panama, Colombia and Venezuela (Compagno et al. 2005).
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Cuba, northern Gulf of Mexico, and Panama
  • North-West Atlantic Ocean species (NWARMS)
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Western Central Atlantic: Cuba, northern Gulf of Mexico, and Panama.
  • 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)
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Western Atlantic.
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Physical Description

Size

Maximum size: 460 mm TL
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Max. size

46.0 cm TL (male/unsexed; (Ref. 244)); 41 cm TL (female)
  • 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)
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Diagnostic Description

Relatively slender, moderately long, narrow snout and relatively narrow, low caudal fin. Color uniform dark brown (Ref. 37039). First to third gill openings long as the distance between the nostrils (Ref. 6032).
  • Bigelow, H.B. and W.C. Schroeder 1948 Sharks. p. 59-546. In J. Tee-Van, C.M. Breder, S.F. Hildebrand, A.E. Parr and W.C. Schroeder (eds.) Fishes of the Western North Atlantic. Part one. Lancelets, cyclostomes, sharks. Sears Foundation for Marine Research, Yale University, New Haven. 576 p. (Ref. 6032)
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Known from the continental slope at depths of 732 to 1,461 m (Compagno et al. 2005). Maximum size 46 cm total length (TL); adult males 43 to 46 cm TL, adult females 40 to 41 cm TL. Little is known of its biology. Oviparous, with a single egg per oviduct laid at a time (Compagno in prep. b).

Systems
  • Marine
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benthic
  • North-West Atlantic Ocean species (NWARMS)
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Found at depths of 860 - 1098m.
  • North-West Atlantic Ocean species (NWARMS)
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Environment

bathydemersal; marine; depth range 700 - 1500 m (Ref. 55584)
  • Kiraly, S.J., J.A. Moore and P.H. Jasinski 2003 Deepwater and other sharks of the U.S. Atlantic Ocean Exclusive Economic Zone. Mar. Fish. Rev. 65(4):1-64. (Ref. 55584)
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Depth range based on 10 specimens in 1 taxon.
Water temperature and chemistry ranges based on 4 samples.

Environmental ranges
  Depth range (m): 732 - 1006
  Temperature range (°C): 4.756 - 5.441
  Nitrate (umol/L): 24.827 - 27.969
  Salinity (PPS): 34.840 - 34.953
  Oxygen (ml/l): 3.755 - 4.229
  Phosphate (umol/l): 1.601 - 1.957
  Silicate (umol/l): 22.517 - 28.695

Graphical representation

Depth range (m): 732 - 1006

Temperature range (°C): 4.756 - 5.441

Nitrate (umol/L): 24.827 - 27.969

Salinity (PPS): 34.840 - 34.953

Oxygen (ml/l): 3.755 - 4.229

Phosphate (umol/l): 1.601 - 1.957

Silicate (umol/l): 22.517 - 28.695
 
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Depth: 860 - 1098m.
From 860 to 1098 meters.

Habitat: bathydemersal. Found on the continental slopes. Oviparous, with one egg per oviduct laid at a time. Sexual dimorphism in adults unusually well-developed. Not utilized at present.
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Life History and Behavior

Life Cycle

Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449). Sexual dimorphism is evident in dentition of males (Ref. 49562). Males have longer teeth with fewer cusps (Ref. 51093) to make 'courtship biting' more effective (Ref. 49562).
  • 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)
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Apristurus riveri

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 1
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
2007

Assessor/s
Leandro, L. & Kyne, P.M.

Reviewer/s
Cavanagh, R.D. & Fowler, S.L. (Shark Red List Authority)

Contributor/s

Justification
An uncommon and poorly known deepwater catshark recorded from 732 to 1,461 m in the Western Central Atlantic where it is known from the northern Gulf of Mexico, Cuba, Dominican Republic, Mexico, Honduras, Panama, Colombia and Venezuela. Reaches 46 cm total length (TL) but nothing known of its biology. Of no interest to fisheries at present. Insufficient information available to assess the species beyond Data Deficient at this time.

History
  • 2004
    Data Deficient
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Population

Population
Reported as uncommon (Compagno in prep. b).

Population Trend
Unknown
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Threats

Major Threats
Of no interest to fisheries (Compagno, in prep. b).
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Data deficient (DD)
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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Management

Conservation Actions

Conservation Actions
Further research is required on this poorly known species in order to better document its distribution, biology and bycatch levels.
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: of no interest
  • 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)
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Wikipedia

Broadgill catshark

The broadgill catshark, Apristurus riveri, is a catshark of the family Scyliorhinidae, found in the Gulf of Mexico and the Caribbean Sea, between 30°N and 9° N, on the continental slopes at depths between 700 and 1,500 m. Its length is up to 46 cm. The reproduction of the broadgill catshark is oviparous.

See also[edit]

References[edit]

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