|Scientific Name:||Centroscyllium ritteri Jordan & Fowler, 1903|
|Red List Category & Criteria:||Data Deficient ver 3.1|
|Assessor(s):||Nakaya, K., Tanaka, S. & McCormack, C.|
|Reviewer(s):||Stevens, J., Valenti, S.V., Fowler, S.L. & IUCN SSG Asia Northwest Pacific Red List Workshop participants (Shark Red List Authority)|
Whitefin Dogfish (Centroscyllium ritteri is a small (to 43 cm TL), little known deepwater dogfish endemic to Japan and the northwestern range of the Emperor Seamounts in the northwest and central western Pacific Ocean. The species occurs at depths of 110–1,100 m. There are no species-specific catch data available, but it is taken by deepwater trawl fisheries operating in the region and most probably discarded because of its small size. However, survivorship of discards is probably very low to nil. Insufficient information is available to assess this species beyond Data Deficient at present, but given that its limited range and low survivorship when discarded, its status is of concern. The species should be monitored to allow full evaluation of its threat status.
|Range Description:||Northwest Pacific: endemic to Japan (Honshu, eastern Hokkaido), Jingu and Lira Seamounts, northwestern Range (Compagno in prep.).|
Native:Japan (Hokkaido, Honshu)
|FAO Marine Fishing Areas:|
Pacific – northwest
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||Population size is unknown. No data are available to evaluate population trends.|
|Current Population Trend:||Unknown|
|Habitat and Ecology:||Demersal deepwater species found on the slope at depths of 150–1,100 m (Taniuchi and Nose 1987). Females mature at 42–43 cm total length (TL) (Compagno in prep.) and the species attains at least 43.0 cm TL. Reproduction is presumably ovoviviparous.|
Deep water sharks are targeted in a localized fishery in Suruga Bay, Japan for their squalene rich-livers (Compagno in prep., Ishihara pers. comm. 2006). This species is captured as bycatch in trawls and may be discarded, however post-discard survival rates are probably very low to nil (K. Nakaya pers. obs. 2007).
While some offshore trawlers are only licensed to fish within their prefecture, others have licenses which allow them to fish beyond these borders and fishing extends out to the Emperor Seamount Chain east of Japan (Ishihara pers. comm. 2006). Species-specific catch data are needed to assess how fisheries may be impacting this species.
None in place. Like many deepwater species more information is needed on the biology, ecology and importance to fisheries to assess future conservation needs. Where taken, catches require monitoring, particularly as deepwater fisheries expand worldwide.
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.
|Citation:||Nakaya, K., Tanaka, S. & McCormack, C. 2009. Centroscyllium ritteri. The IUCN Red List of Threatened Species 2009: e.T161508A5439256.Downloaded on 21 November 2017.|
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