Overview

Comprehensive Description

Biology

Ovoviviparous (Ref. 205).
  • Howe, J. and V.G. Springer 1993 Catalog of type specimens of recent fishes in the National Museum of Natural History, Smithsonian Institution, 5: Sharks (Chondrichthyes: Selachii). Smithson. Contrib. Zool. 540:19. (Ref. 13292)
Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© FishBase

Source: FishBase

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Distribution

Range Description

Northwest Pacific: known only from the Emperor Seamount Chain east of Japan and the Kuril Islands at the type locality, 38°37' to 49°59'N, 171°06' to 170°00'E (Compagno in prep.).
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Northwest Pacific: Emperor Seamount chain.
  • Shirai, S. and K. Nakaya 1990 A new squalid species of the genus Centroscyllium from the Emperor Seamount chain. Jap. J. Ichthyol. 36(4):391-398. (Ref. 31244)
Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© FishBase

Source: FishBase

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Emperor Seamount Chain.
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© FishWise Professional

Source: FishWise Professional

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Physical Description

Size

Maximum size: 636 mm TL
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© FishWise Professional

Source: FishWise Professional

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Max. size

63.6 cm TL (male/unsexed; (Ref. 31244))
  • Shirai, S. and K. Nakaya 1990 A new squalid species of the genus Centroscyllium from the Emperor Seamount chain. Jap. J. Ichthyol. 36(4):391-398. (Ref. 31244)
Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© FishBase

Source: FishBase

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Type Information

Paratype for Centroscyllium excelsum Shirai & Nakaya
Catalog Number: USNM 300576
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Preparation: Photograph
Year Collected: 1977
Locality: the Emperor Seamount Chain., Pacific
Depth (m): 800 to 1000
  • Paratype: Shirai, S. & Nakaya, K. 1990. Japanese Journal of Ichthyology. 36 (4): 392.
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes

Source: National Museum of Natural History Collections

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Found on or near the bottom at depths of 800-1,000 m. Only 21 specimens have been collected and biology is largely unknown. The species attains at least 63.6 cm total length (TL) (Shirai and Nakaya 1990). Mature specimens have measured from 53 cm TL and 52 cm TL for females and males respectively. Reproduction is ovoviviparous. A litter of 10 was found in one pregnant female and size at birth has been estimated at 8-9.3 cm (near-term fetuses). The Highfin Dogfish feeds on bony fishes (Shirai and Nakaya 1990, Compagno in prep.).

Systems
  • Marine
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Environment

bathydemersal; marine; depth range 800 - 1000 m (Ref. 31244)
  • Shirai, S. and K. Nakaya 1990 A new squalid species of the genus Centroscyllium from the Emperor Seamount chain. Jap. J. Ichthyol. 36(4):391-398. (Ref. 31244)
Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© FishBase

Source: FishBase

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Depth: 800 - 1000m.
From 800 to 1000 meters.

Habitat: bathydemersal.
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© FishWise Professional

Source: FishWise Professional

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Life History and Behavior

Life Cycle

Distinct pairing with embrace (Ref. 205).
  • 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)
Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© FishBase

Source: FishBase

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
DD
Data Deficient

Red List Criteria

Version
3.1

Year Assessed
2009

Assessor/s
McCormack, C., Nakaya, K. & Samiengo, B.

Reviewer/s
Valenti, S.V. & Fowler, S.L. (Shark Red List Authority)

Contributor/s

Justification
This little known small (to at least 63.6 cm total length) deepwater shark is endemic to the Emperor Seamount Chain east of Japan and the Kuril Islands in the northwest Pacific Ocean at 80-1,000 m depth. The Highfin Dogfish (Centroscyllium excelsum) is known from very few specimens and its biology is largely unknown. Some offshore trawlers off Japan fish on the Emperor Seamounts, however, there are no data available to determine whether this species is taken. If fishing occurs within the depth range of this species, its restricted distribution makes it vulnerable to overfishing. Insufficient information is available to assess this species beyond Data Deficient and efforts should be made to determine the level of threat to this potentially biologically vulnerable species.
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Population

Population
Only known from 21 specimens.

Population Trend
Unknown
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Threats

Major Threats
The restricted distribution of the species may make it vulnerable to deep-sea trawl and longline fisheries, especially those that can accurately target deepwater teleosts on restricted deepwater bottom habitats including the slopes of seamounts (Compagno in prep.).

While some trawlers off Japan are restricted to fishing within the borders of their prefectures, others conduct fisheries on the Emperor Seamounts (H. Ishihara pers. comm. 2006). Fisheries have operated on the Emperor seamount chain since the 1960s. Some of these have led to dramatic declines in the target stock but there is no information to determine whether this species was taken as bycatch. For example, Japanese and former USSR vessels began targeting armourheads (Pseudopentaceros species) with trawls in the Emperor Seamount chain and the northern Hawaiian Ridge areas in 1969 (Maguire et al. 2006). Between 1969 and 1977, the Japanese fleet sent two to five trawlers a year to this area and averaged catches of 22,800 to 35,100 tonnes a year. By 1977 to 1982 catches had fallen to 5,800-9,900 tonnes a year (Maguire et al. 2006). Pseudopentaceros species occur to 600 m depth. There is no evidence that either of the fish stocks will recover enough to allow commercially viable fisheries in the near future (Maguire et al. 2006).

There is no information to determine whether this species is taken in fisheries on the Emperor Seamount chain and the Kuril Islands, but any bycatch is of concern given the species' limited range. Furthermore, the species may have limiting life history characteristics, similar to other deepwater shark species, thus will not be sufficiently fecund to withstand high levels of exploitation.
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Data deficient (DD)
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© FishBase

Source: FishBase

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Management

Conservation Actions

Conservation Actions
No management or conservation efforts are currently in place. Like many deeper water species more information on biology, ecology and importance in fisheries are required to further assess status and any future conservation needs. Data are required to determine whether this species is captured in fisheries operating throughout its range.

The development and implementation of management plans (national and/or regional e.g., under the FAO International Plan of Action for the Conservation and Management of Sharks: IPOA-Sharks) are required to facilitate the conservation and management of all chondrichthyan species in the region.
Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© International Union for Conservation of Nature and Natural Resources

Source: IUCN

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Wikipedia

Highfin dogfish

The highfin dogfish, Centroscyllium excelsum, is a sleeper shark of the family Etmopteridae, found in the northwest Pacific Ocean on the Emperor Seamount chain between latitudes 50 and 38°N, at depths between 800 and 1,000 m. It reaches a length of 63 cm.

The highfin dogfish is ovoviviparous.

References[edit]

Creative Commons Attribution Share Alike 3.0 (CC BY-SA 3.0)

Source: Wikipedia

Unreviewed

Article rating from 0 people

Default rating: 2.5 of 5

Disclaimer

EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

To request an improvement, please leave a comment on the page. Thank you!