Rajella barnardi, Bigthorn skate : fisheries

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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)
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drawing shows typical species in Rajidae.

Classification / Names आम नाम | उपशब्द | Catalog of Fishes(वर्ग, प्रजाति) | ITIS | CoL | WoRMS | Cloffa

इलाज़मौबरांकी (शारक और रेज़) (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 / गहराई सीमा / distribution range पारिस्थितिकी

समुद्री बाथीड़िमरसल; गहराई सीमा 102 - 1207 m (Ref. 106604). Deep-water

वितरण देश | ऐफ ऐ ओ क्षेत्र | Ecosystems | संयोग | बिन्दु नक्शा | भूमिका | 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.

आकार / वज़न / Age

परिपक्व अवधि: Lm ?  range ? - ? cm
Max length : 75.0 cm TL पुल्लिंग / अलिंग; (Ref. 106604)

जीवविज्ञान     शब्द संग्रह (उदाहरणार्थ 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 परिपक्व अवधि | पुनरुत्पत्ति | मछलीऔ का अंडे देना | अंडे | Fecundity | लार्वा

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

Main reference Upload your references | संदर्भ | संयोजक : McEachran, John | सहयोगीयो

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 2025-1)

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

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

मात्स्यिकी: bycatch
FAO - Publication: search | FishSource |

अधिक जानकारी

Trophic ecology
Food items (preys)
संघटक आहार
आहार खपत
Food rations
परभक्षी
पारिस्थितिकी
पारिस्थितिकी
Home ranges
Population dynamics
Growth parameters
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversion
भर्ती
बहुतायत
Life cycle
पुनरुत्पत्ति
परिपक्व अवधि
Maturity/Gills rel.
Fecundity
मछलीऔ का अंडे देना
Spawning aggregations
अंडे
Egg development
लार्वा
लारवल गतिकी
वितरण
देश
ऐफ ऐ ओ क्षेत्र
Ecosystems
संयोग
भूमिका
BRUVS - Videos
Anatomy
गिल क्षेत्र
Brain
Otolith
Physiology
Body composition
Nutrients
Oxygen consumption
Swimming type
Swimming speed
Visual pigments
Fish sound
Diseases & Parasites
Toxicity (LC50s)
आनुवंशिकी
Genome
आनुवंशिकी
Heterozygosity
हैरेटिबिलटी
Human related
Aquaculture systems
जलीयकृषि रूपरेखाऐ
खींच
Ciguatera cases
Stamps, coins, misc.
Outreach
सहयोगीयो
Taxonomy
आम नाम
उपशब्द
आकृति विज्ञान
मौरफोमैटरिक्स
तस्वीरे
संदर्भ
संदर्भ

साधन

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इंटरनेट स्रोत

AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes: वर्ग, प्रजाति | 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, खोज | World Records Freshwater Fishing | Zoological Record

Estimates based on models

Preferred temperature (संदर्भ 123201): 4.6 - 11.8, mean 7.3 °C (based on 89 cells).
Phylogenetic diversity index (संदर्भ 82804):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00324 (0.00197 - 0.00532), b=3.22 (3.08 - 3.36), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245).
Trophic level (संदर्भ 69278):  3.5   ±0.43 se; based on food items.
लौटाव (संदर्भ 120179):  निम्न, न्यूनतम जनसंख्या दुगनी होने का समय 4.5 - 14 वर्ष। (Fec assumed to be <100).
Fishing Vulnerability (Ref. 59153):  Moderate to high vulnerability (50 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);