Catalog Number: USNM 300576
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
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.
Habitat and Ecology
From 800 to 1000 meters.
Life History and Behavior
IUCN Red List Assessment
Red List Category
Red List Criteria
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.
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.
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.