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Raja binoculata  Girard, 1855

Big skate
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| Native range | All suitable habitat | PointMap | Year 2100 |
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Raja binoculata   AquaMaps   Data sources: GBIF OBIS
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Image of Raja binoculata (Big skate)
Raja binoculata
Picture by Gotshall, D.W.

Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (sharks and rays) > Rajiformes (Skates and rays) > Rajidae (Skates)
Etymology: Raja: Latin, raja, -ae = a sting ray (Raja sp.) (Ref. 45335);  binoculata: From the Latin 'bi' meaning two and 'oculata' meaning eyed - referring to the arrangement of pigment on the pectoral fin bases (Ref. 6885).   More on author: Girard.

Environment / Climate / Range Ecology

Marine; demersal; depth range 3 - 800 m (Ref. 6793), usually 3 - 110 m (Ref. 2850).   Temperate; 61°N - 31°N, 165°W - 117°W (Ref. 55279)

Length at first maturity / Size / Weight / Age

Maturity: Lm ?, range 130 - ? cm
Max length : 244 cm TL male/unsexed; (Ref. 2850); common length : 180 cm TL male/unsexed; (Ref. 2850); max. published weight: 91.0 kg (Ref. 2850)

Short description Morphology | Morphometrics

Dorsal spines (total): 0; Dorsal soft rays (total): 0; Anal spines: 0; Anal soft rays: 0. Dorsal fins well back on tail, small; caudal and anal fins absent; pectorals broad, attached to snout and incorporated with body; pelvic fins large, moderately concave on free margins (Ref. 6885). Posterior sides of tail with a small fleshy keel on either side (Ref. 6885).

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

North Pacific: Glubokaya Bay, Cape Navarin, and Stalemate Bank to Cedros Island, Baja California, Mexico.

Biology     Glossary (e.g. epibenthic)

Largest skate in North America (Ref. 2850). Feed on crustaceans and fishes (Ref. 6885). Oviparous. Distinct pairing with embrace. Young may tend to follow large objects, such as their mother (Ref. 205). Eggs are oblong capsules with stiff pointed horns at the corners deposited in sandy or muddy flats (Ref. 205). Egg capsules are 22.8-30.5 cm long and 11.0-19.4 cm wide (Ref. 41249, 41300, 41357). Pectoral fins utilized for human consumption (Ref. 2850). Marketed fresh and frozen; eaten fried and baked (Ref. 9988).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Up to 7 embryos per egg case (Ref. 2850). Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449). Distinct pairing with embrace. Young may tend to follow large objects, such as their mother (Ref. 205).

Main reference Upload your references | References | Coordinator : McEachran, John | Collaborators

McEachran, J.D. and K.A. Dunn, 1998. Phylogenetic analysis of skates, a morphologically conservative clade of elasmobranchs (Chondrichthyes: Rajidae). Copeia 1998(2):271-290. (Ref. 27314)

IUCN Red List Status (Ref. 96402)

CITES (Ref. 94142)

Not Evaluated

Threat to humans

  Harmless




Human uses

Fisheries: commercial; aquarium: public aquariums
FAO(Publication : search) | FisheriesWiki | Sea Around Us

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Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Trophic Level (Ref. 69278):  3.9   ±0.64 se; Based on food items.
Resilience (Ref. 69278):  Low, minimum population doubling time 4.5 - 14 years (Fec assumed to be <100).
Vulnerability (Ref. 59153):  Very high vulnerability (83 of 100) .
Price category (Ref. 80766):   Medium.