Overview

Comprehensive Description

Biology

Ovoviviparous (Ref. 205).
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Distribution

Range Description

Northwest Pacific: Suruga Bay, Honshu, Japan (Compagno et al. 2005).
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Northwest Pacific: Suruga Bay and adjacent waters of Japan.
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Western North Pacific.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Slope on or near bottom, at 450 to 830 m (Yano and Tanaka 1984, Compagno et al. 2005). The holotype was an adult male and measured 101 cm total length (TL) (Compagno in prep.). Size at maturity is apparently 126 cm for females and 89 cm TL for males. Maximum recorded size is 145.5 cm TL for a female (Yano and Tanaka 1984). Mature females measuring from 126 to 145.5 cm TL had 29 to 56 ova measuring 3 to 5 cm in diameter in their ovary (Yano and Tanaka 1984).

Systems
  • Marine
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Environment

bathypelagic; marine; depth range 500 - 800 m (Ref. 31249)
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Depth: 500 - 800m.
From 500 to 800 meters.
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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
2009

Assessor/s
McCormack, C. & Tanaka, S.

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

Contributor/s

Justification
The Japanese Velvet Dogfish (Zameus ichiharai) is a deepwater dogfish known only from Suruga Bay, Honshu, Japan, on the slope at 450?830 m depth. Very little is known of its biology, however, other deepwater squaloids have proved vulnerable to population collapse from overfishing (directed or bycatch) due to their limited life history characteristics. A longline fishery currently targets deepwater sharks in Suruga Bay and offshore trawlers operate within the species depth range off Japan. There are no species-specific bycatch data available to determine whether this species is taken. This species is currently assessed as Data Deficient, due to a total lack of information on population trends and capture in fisheries, despite concern that deepwater fisheries operate within its restricted known range. 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. Reassessment should be a priority as soon as information becomes available.
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Population

Population
No information available. Only known from the holotype and several paratypes (Compagno in prep).

Population Trend
Unknown
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Threats

Major Threats
Caught by deepset line surveys and fisheries (Yana and Tanaka 1984, Compagno et al. 2005). A localised fishery targeting deepwater sharks operates in Suruga Bay, Honshu, Japan, using bottom longlines (Compagno in prep. and S.Tanaka, per. com.). It is unknown whether this species comprises part of the catch in this fishery, but this shark is very rare (S.Tanaka pers. comm.). Given the apparent restricted range of this species, the fact that fisheries operate across its depth range may be cause for concern. Particularly as deepwater squaloids are vulnerable to population collapse from overfishing (directed or bycatch) due to their limited life history characteristics.
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Data deficient (DD)
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Management

Conservation Actions

Conservation Actions
None in place.
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Wikipedia

Japanese velvet dogfish

The Japanese velvet dogfish, Zameus ichiharai, is a harmless deepwater sleeper shark of the family Somniosidae, found in the northwest Pacific from Suruga Bay and adjacent waters of Japan at depths of between 500 and 800 metres (1,600 and 2,600 ft). Reproduction is ovoviviparous.[2]

References[edit source | edit]

  1. ^ McCormack, C. & Tanaka, S. 2009. Zameus ichiharai. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.1. <www.iucnredlist.org>. Downloaded on 25 August 2013.
  2. ^ Froese, Rainer and Pauly, Daniel, eds. (2013). "Zameus ichiharai" in FishBase. June 2013 version.


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