Rajella barnardi, Bigthorn skate : fisheries

Rajella barnardi (Norman, 1935)

Bigthorn skate
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Rajella barnardi   AquaMaps   Data sources: GBIF OBIS
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Image of Rajella barnardi (Bigthorn skate)
No image available for this species;
drawing shows typical species in Rajidae.

Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (sharks and rays) > Rajiformes (Skates and rays) > Rajidae (Skates)
Etymology: Rajella: Latin, raja, -ae = a sting ray (Raja sp.) (Ref. 45335).
Eponymy: Dr Keppel Harcourt Barnard (1887–1964) was a UK-born South African invertebrate zoologist particularly interested in marine crustaceans. [...] (Ref. 128868), visit book page.
More on author: Norman.

Environment: milieu / climate zone / depth range / distribution range Ecology

Marine; bathydemersal; depth range 102 - 1207 m (Ref. 106604). Deep-water

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

Eastern Atlantic: off Mauritania to South Africa, probably throughout on the deep, middle and upper slope, even on outer shelf of Namibia and South Africa.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 75.0 cm TL male/unsexed; (Ref. 106604)

Biology     Glossary (e.g. epibenthic)

Found on the outer shelf and upper slope (Ref. 5578). Feeds on small crustaceans, squid and polychaete worms (Ref. 5578). Oviparous (Ref. 50449). Eggs have horn-like projections on the shell (Ref. 205). Taken by hake trawlers (Ref. 5578).

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

Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449).

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. 130435: Version 2025-2 (Global))

  Least Concern (LC) ; Date assessed: 31 August 2020

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

Fisheries: bycatch
FAO - Publication: search | FishSource |

More information

Trophic ecology
Food items (preys)
Diet composition
Food consumption
Food rations
Predators
Ecology
Ecology
Population dynamics
Growth parameters
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversion
Recruitment
Abundance
Life cycle
Reproduction
Maturity
Maturity/Gills rel.
Fecundity
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Spawning aggregations
Eggs
Egg development
Larvae
Larval dynamics
Distribution
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BRUVS - Videos
Anatomy
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Genetics
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Stamps, coins, misc.
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References
References

Tools

E-book | Field guide | Length-frequency wizard | Life-history tool | Point map | Catch-MSY |

Special reports

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Summary page | Point data | Common names | Photos

Internet sources

AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes: genus, species | DiscoverLife | ECOTOX | FAO - Publication: search | Faunafri | Fishipedia | Fishtrace | GloBI | Google Books | Google Scholar | Google | IGFA World Record | OneZoom | Open Tree of Life | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | TreeBase | Tree of Life | Wikipedia: Go, Search | World Records Freshwater Fishing | Zoological Record

Estimates based on models

Phylogenetic diversity index
(Ref. 82804) 		PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight a=0.00331 (0.00199 - 0.00551), b=3.21 (3.07 - 3.35), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245).
Trophic level
(Ref. 69278) 		3.5   ±0.43 se; based on food items.
Resilience
(Ref. 120179) 		Low, minimum population doubling time 4.5 - 14 years (Fec assumed to be <100).
Fishing Vulnerability
(Ref. 59153) 		Moderate to high vulnerability (53 of 100). 🛈
Price category
(Ref. 80766) 		Medium.
Nutrients
(Ref. 124155) 		Calcium = 9.41 [1.70, 47.02] mg/100g; Iron = 0.362 [0.086, 1.105] mg/100g; Protein = 16.6 [13.7, 19.2] %; Omega3 = 0.615 [0.183, 2.451] g/100g; Selenium = 15 [4, 49] μg/100g; VitaminA = 7.58 [1.88, 30.92] μg/100g; Zinc = 0.34 [0.17, 0.63] mg/100g (wet weight);