Oxynotus japonicus 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Chondrichthyes Squaliformes Oxynotidae

Scientific Name: Oxynotus japonicus Yano & Murofushi, 1985
Common Name(s):
English Japanese Roughshark

Assessment Information [top]

Red List Category & Criteria: Data Deficient ver 3.1
Year Published: 2004
Date Assessed: 2004-04-30
Needs updating
Assessor(s): Yano, K.
Reviewer(s): Kyne, P.M. & Cavanagh, R.D. (Shark Red List Authority)
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.

Geographic Range [top]

Range Description:Limited area (Suruga Bay and Enshu-nada Sea) in Japan.
Countries occurrence:
FAO Marine Fishing Areas:
Pacific – northwest
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Current Population Trend:Unknown
Additional data:

Habitat and Ecology [top]

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.

Threats [top]

Major Threat(s): Bycatch of bottom trawl fisheries in Suruga Bay and Enshu-nada Sea. Bycatch always discarded.

Classifications [top]

10. Marine Oceanic -> 10.1. Marine Oceanic - Epipelagic (0-200m)

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
In-Place Species Management
In-Place Education
5. Biological resource use -> 5.4. Fishing & harvesting aquatic resources -> 5.4.4. Unintentional effects: (large scale) [harvest]
♦ timing:Ongoing    

1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.3. Life history & ecology

Bibliography [top]

IUCN. 2004. 2004 IUCN Red List of Threatened Species. Available at: (Accessed: 23 November 2004).

IUCN SSC Shark Specialist Group. Specialist Group website. Available at:

Yano, K. and Matsuura, K. 2002. A review of the genus Oxynotus (Squaliformes, Oxynotidae). Bulletin of the National Science Museum, Tokyo, Series A 28(2): 109–117.

Yano, K. and Murofushi, M. 1985. A new prickly dogfish, Oxynotus japonicus, from Japan. Japanese Journal of Ichthyology 32: 129–136.

Yano, K., Matsuura, K. and Tsukada, O. 2002. Redescription of the rare squaloid shark Oxynotus japonicus from Suruga Bay and the Enshu-nada Sea, Japan. Species Diversity 7(4): 363–369.

Citation: Yano, K. 2004. Oxynotus japonicus. The IUCN Red List of Threatened Species 2004: e.T44206A10870794. . Downloaded on 25 June 2018.
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