Amblyraja badia 

Scope: Global

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Chondrichthyes Rajiformes Rajidae

Scientific Name: Amblyraja badia
Species Authority: (Garman, 1899)
Common Name(s):
English Broad Skate, Roughshoulder Skate
Raja badia Garman, 1899

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2009
Date Assessed: 2008-12-01
Assessor(s): Davis, C.D. & Ebert, D.A.
Reviewer(s): Notarbartolo di Sciara, G., Valenti, S.V. & Fowler, S.L. (Shark Red List Authority)
The Broad Skate (Amblyraja badia) is a moderate sized (to 99 cm TL) deepwater skate known from the continental slopes of the eastern Pacific Ocean from the eastern Bering Sea to Panama. Only a few specimens have been caught throughout its broad geographic range at depths from 846-2,324 m. The species is occasionally taken in deepwater trawl and trap fisheries; however its wide depth range offers a refuge beyond the depth of most fisheries. Given the species' relatively broad geographic range, deep bathymetric distribution, affording refuge from fishing pressure, and in the absence of data to indicate population declines, this species is assessed as Least Concern.

Geographic Range [top]

Range Description:Northeast and eastern central Pacific: from the Navarin Canyon, Eastern Bering Sea to Panama (Beebe and Tee-Van 1941, Ebert 2003).
Countries occurrence:
Canada (British Columbia, Yukon); Mexico; Panama; United States
FAO Marine Fishing Areas:
Pacific – eastern central; Pacific – northeast
Additional data:
Lower depth limit (metres):2324
Upper depth limit (metres):846
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The species is only known from few specimens scattered throughout its broad geographic range. Population size is unknown. Commonly seen in ROV footage below 1,500 m, along the whole of the eastern North Pacific Coast (D. Ebert pers. obs. 2007).
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:A deepwater skate occurring on the continental slope at depths ranging from 846 to 2,324 m (Ebert 2003). Feeds on cephalopods, crustaceans, and small fishes (Ebert 2003). This species is often seen in ROV footage on deep rocky relief areas (D. Ebert pers. obs. 2007). Males reach maturity at 86 to 83 cm total length (TL) (Ebert 2003). Maximum size is 99 cm TL and size at birth ~23 cm TL (Ebert 2003).

Threats [top]

Major Threat(s): Potentially taken as bycatch in deepwater sablefish longline fisheries (in southern California to approximately 600 to 1,200 m), operating in the shallower depths of this species’ range, although there are no records of this over the past five years (D. Ebert pers. obs. 2007). However its wide depth range offers a refuge beyond the depths of most fisheries. This species’ apparent habitat preference for rocky reefs precludes its capture in most trawl fisheries (D. Ebert pers. obs. 2007).

Conservation Actions [top]

Conservation Actions: No management or conservation efforts are currently in place for this species.

The trawl fisheries operating off California are slowly closing down and fleets are 25% of what they used to be (D. Ebert pers. obs. 2007). The Davidson Seamount, located 75 km off the central Californian Coast (within the known range of this species) has been proposed as a Marine Protected Area (D. Ebert pers. obs. 2007). Like many deeper water species more information on biology and ecology are required.

Citation: Davis, C.D. & Ebert, D.A. 2009. Amblyraja badia. The IUCN Red List of Threatened Species 2009: e.T161452A5427302. . Downloaded on 24 August 2016.
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