Animalia > Chordata > Elasmobranchii > Rajiformes > Rajidae > Beringraja > Beringraja binoculata

Beringraja binoculata (Big skate)

Synonyms: Dipturus binoculata; Raja binoculata; Raja cooperi
Language: Danish; Dutch; French; Mandarin Chinese; Polish; Russian; Salish; Spanish; Tsimshian

Wikipedia Abstract

The big skate (Raja binoculata) is the largest species of skate (fish), family Rajidae, in the waters off North America. They are found along the Pacific coast from Alaska to Baja California, typically from the intertidal zone to a depth of 120 m (390 ft), and feed on benthic invertebrates and small fishes. They are unusual among skates in that their egg cases may contain up to seven eggs each.
View Wikipedia Record: Beringraja binoculata


Adult Weight [1]  110.34 lbs (50.05 kg)
Female Maturity [1]  8 years
Litter Size [1]  1,260
Maximum Longevity [1]  26 years

Protected Areas

Name IUCN Category Area acres Location Species Website Climate Land Use
Aleutian Islands Biosphere Reserve 2720489 Alaska, United States    
Channel Islands National Marine Sanctuary   California, United States
Channel Islands National Park II 139010 California, United States
Farallon National Wildlife Refuge IV 352 California, United States
Gwaii Haanas National Park Reserve II 366714 British Columbia, Canada
Mount Arrowsmith Biosphere Reserve 293047 British Columbia, Canada  
Pacific Rim National Park Reserve II 137900 British Columbia, Canada

Prey / Diet

Ammodytes hexapterus (Stout sand lance)[2]
Anoplopoma fimbria (Skil)[3]
Atheresthes stomias (Turbot)[4]
Chionoecetes bairdi (southern Tanner crab)[2]
Chionoecetes opilio (snow crab)[4]
Citharichthys sordidus (Sanddab)[3]
Citharichthys stigmaeus (Speckled sanddab)[3]
Clupea harengus (Yawling)[4]
Clupea pallasii (Pacific herring)[4]
Crangon dalli (ridged crangon)[2]
Gadus chalcogrammus (Whiting)[4]
Gadus macrocephalus (Pacific cod)[4]
Gasterosteus aculeatus (Alaskan stickleback)[4]
Glebocarcinus oregonensis (pygmy rock crab)[2]
Hemilepidotus jordani (Yellow Irish lord)[4]
Hippoglossus stenolepis (Pacific halibut)[4]
Leptoclinus maculatus (Daubed shanny)[4]
Limanda aspera (Yellowfin sole)[4]
Mallotus villosus (Capelin)[4]
Metacarcinus magister (Dungeness crab)[3]
Myoxocephalus polyacanthocephalus (Sculpin)[4]
Neocrangon communis (gray shrimp)[2]
Pagurus aleuticus (Aleutican hermit)[2]
Parophrys vetulus (English sole)[3]
Pleurogrammus monopterygius (Atka mackerel)[4]
Pleuronectes quadrituberculatus (Alaska plaice)[4]
Protomyctophum thompsoni (Bigeye lanternfish)[4]
Sebastes polyspinis (Rockfish)[4]

Prey / Diet Overlap

Competing SpeciesCommon Prey Count
Atheresthes evermanni (Kamchatka flounder)1
Atheresthes stomias (Turbot)2
Balaenoptera acutorostrata (Minke Whale)1
Bathyraja aleutica (Aleutian skate)2
Bathyraja interrupta (Sandpaper skate)2
Brachyramphus brevirostris (Kittlitz's Murrelet)1
Brachyramphus marmoratus (Marbled Murrelet)1
Callorhinus ursinus (Northern Fur Seal)1
Careproctus furcellus (Emarginate snailfish)1
Cepphus columba (Pigeon Guillemot)1
Cerorhinca monocerata (Rhinoceros Auklet)1
Clangula hyemalis (Oldsquaw)2
Crystallichthys cyclospilus (Blotched snailfish)1
Dasycottus setiger (Spinyhead sculpin)4
Eumetopias jubatus (Steller Sea Lion)1
Fratercula cirrhata (Tufted Puffin)1
Fratercula corniculata (Horned Puffin)1
Gadus chalcogrammus (Whiting)2
Gadus macrocephalus (Pacific cod)4
Hemilepidotus hemilepidotus (Red Irish lord)1
Hemilepidotus jordani (Yellow Irish lord)1
Hexagrammos decagrammus (Kelp greenling)1
Hexagrammos stelleri (Greenling)3
Hippoglossoides elassodon (Paper sole)4
Hippoglossus stenolepis (Pacific halibut)4
Hydrolagus colliei (Spotted rattfish)1
Lepidopsetta polyxystra (Northern rock sole)3
Leptocottus armatus (Cabezon)1
Limanda aspera (Yellowfin sole)2
Megaptera novaeangliae (Humpback Whale)1
Merluccius productus (Whiting)1
Metacarcinus magister (Dungeness crab)1
Oncorhynchus clarkii (Cutthroat trout)1
Ophiodon elongatus (Lingcod)1
Phalacrocorax auritus (Double-crested Cormorant)1
Phalacrocorax pelagicus (Pelagic Cormorant)1
Podiceps auritus (Horned Grebe)1
Podiceps grisegena (Red-necked Grebe)1
Raja rhina (Longnose skate)2
Reinhardtius hippoglossoides (Turbot)1
Rhacochilus vacca (Pile surfperch)1
Rissa tridactyla (Black-legged Kittiwake)1
Scorpaenichthys marmoratus (Sculpin)1
Sebastes caurinus (Copper rockfish)1
Sebastes crameri (Rockfish)1
Sebastes flavidus (Yellowtail rockfish)1
Sebastes melanops (Black bass)1
Squalus acanthias (Common spiny)1
Sterna paradisaea (Arctic Tern)1
Synthliboramphus antiquus (Ancient Murrelet)1
Uria aalge (Common Murre)1


Hippoglossus stenolepis (Pacific halibut)[4]
Notorynchus cepedianus (Tiger shark)[4]


Parasitized by 
Acanthobothrium brachyacanthum[5]
Acanthobothrium brevissime[4]
Acanthobothrium floridensis[4]
Acanthobothrium paulum[4]
Gilquinia squali[5]
Nybelinia riseri[5]
Otodistomum cestoides[4]
Pinguicollum pinguicollum[5]


Alaska (USA); Arctic Ocean; California Current; Canada; East Bering Sea; Gulf of Alaska; Mexico; North Pacific: Glubokaya Bay, Cape Navarin, and Stalemate Bank to Cedros Island, Baja California, Mexico.; Pacific Ocean; Pacific, Eastern Central; Pacific, Northeast; Pacific, Northwest; Russian Federation; USA (contiguous states); West Bering Sea;



Attributes / relations provided by
1de Magalhaes, J. P., and Costa, J. (2009) A database of vertebrate longevity records and their relation to other life-history traits. Journal of Evolutionary Biology 22(8):1770-1774
2Diet and trophic ecology of skates in the Gulf of Alaska (Raja and Bathyraja spp.): ecological information for ecosystem–based management of demersal resources, David A. Ebert, Joseph J. Bizzarro, Simon C. Brown, Mariah D. Boyle, and Gregor M. Cailliet, NPRB Project 621 Final Report (2008)
3Szoboszlai AI, Thayer JA, Wood SA, Sydeman WJ, Koehn LE (2015) Forage species in predator diets: synthesis of data from the California Current. Ecological Informatics 29(1): 45-56. Szoboszlai AI, Thayer JA, Wood SA, Sydeman WJ, Koehn LE (2015) Data from: Forage species in predator diets: synthesis of data from the California Current. Dryad Digital Repository.
4Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
5Gibson, D. I., Bray, R. A., & Harris, E. A. (Compilers) (2005). Host-Parasite Database of the Natural History Museum, London
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Weather provided by NOAA METAR Data Access