Overview

Comprehensive Description

Biology

Holotype trawled from a depth between 225 and 270 m (Ref. 31258). Ovoviviparous (Ref. 205).
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Distribution

Range Description

Limited area (Suruga Bay and Enshu-nada Sea) in Japan.
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Northwest Pacific: Suruga Bay, Japan.
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Japan.
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Physical Description

Size

Maximum size: 540 mm TL
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Max. size

54.0 cm TL (male/unsexed; (Ref. 31258))
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
All specimens were collected in a depth range of 150 to 350 m by bottom trawl nets. Reaches at least 64.5 cm TL (female). Size at maturity 59 cm TL (females) and 54 cm TL (males). No other information on biology.

Systems
  • Marine
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Environment

bathydemersal; marine; depth range 225 - 270 m (Ref. 31258)
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Depth range based on 1 specimen in 1 taxon.

Environmental ranges
  Depth range (m): 247.5 - 247.5
 
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Depth: 225 - 270m.
From 225 to 270 meters.

Habitat: bathydemersal.
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Life History and Behavior

Life Cycle

Distinct pairing with embrace (Ref. 205).
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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
2004

Assessor/s
Yano, K.

Reviewer/s
Kyne, P.M. & Cavanagh, R.D. (Shark Red List Authority)

Contributor/s

Justification
A rare deepsea shark, known from only seven specimens, with a limited distribution area in Japan where it has been recorded in 150 to 350 m. Reaches a maximum size of at least 64.5 cm total length (TL), but very little information on biology. Bycatch of bottom trawl fisheries in Suruga Bay and Enshu-nada Sea. At this time the species cannot be assessed beyond Data Deficient. However, given that its entire known geographic and depth range is affected by trawl fisheries, and other deepsea species have exhibited declines in Suruga Bay, the species may be threatened and a revised assessment is necessary when more information is available and/or if fisheries expand in the future and catches of this species increase.
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Population

Population Trend
Unknown
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Threats

Major Threats
Bycatch of bottom trawl fisheries in Suruga Bay and Enshu-nada Sea. Bycatch always discarded.
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Data deficient (DD)
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Wikipedia

Japanese roughshark

The Japanese roughshark, Oxynotus japonicus, is a rare species of shark in the family Oxynotidae, known only from a handful of specimens recovered from Suruga Bay and the Enshunada Sea off Japan. It is a benthic species that occurs at a depth of 150–350 m (490-1148 ft). This shark is caught (and discarded) as by-catch by bottom trawlers throughout its entire limited range, and may be threatened given the declines in other bottom deep sea species in Suruga Bay.[1]

This species grows to 64.5 cm (26 in) long.[1] It is similar to other rough sharks in having a stout, high trunk, a dorsally depressed head, and two sail-like dorsal fins with deeply embedded spines. The snout is short, with large nostrils whose lateral and medial apertures are separated by a thick nasal flap. The eyes and spiracles are oval in shape. The five pairs of gill slits are very small and vertical. The mouth is small, with thick, fleshy lips; the teeth in the upper jaw are narrow, erect, and smooth-edged, while those in the lower jaw are broad, blade-like, and smooth-edged. Only one row of teeth in the lower jaw are functional.[2]

The large dorsal fins are subtriangular in shape, with the first dorsal spine sloping slightly backward. The pectoral fins have a convex front margin and a concave rear margin. The anal fin is absent. There is a strong ridge running between the pectoral and pelvic fins on each side of the body. The dermal denticles are large and widely spaced, giving the skin a very rough texture. This species differs from the similar sailfin roughshark in the positioning of the dorsal fins and the shape of the spiracle. The color is a uniform dark brown, with the lips, nasal flap margins, fin axils and inner margins of claspers white.[2]

Reproduction is ovoviviparous, as in other dogfish sharks.[3] Size at maturity is 59 cm (23.5 in) long for females and 54 cm (21.5 in) long for males.[1]

References[edit source | edit]

  1. ^ a b c d Yano, K. (2004). Oxynotus japonicus. In: IUCN 2008. IUCN Red List of Threatened Species. Retrieved December 22, 2008.
  2. ^ a b Yano, K. and Murofushi, M. (1985). "A New Prickly Dogfish, Oxynotus japonicus, from Japan". Japanese Journal of Ichthyology 32 (2): 129–136. 
  3. ^ Froese, Rainer and Pauly, Daniel, eds. (2008). "Oxynotus japonicus" in FishBase. December 2008 version.
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