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Leucoraja circularis (Couch 1838)的圖片
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Leucoraja circularis (Couch 1838)

Diagnostic Description ( 英語 )

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Snout short, its tip somewhat pronounced; upper surface entirely spinulose, about 8 thorns generally in a complete row around inner margin of eye and a triangle of thorns on nape or shoulder region; underside with prickles only on snout, between gill-slits, along abdomen, and at anterior margins of disc; tail only slightly longer than body; upper surface reddish-brown to dark brown with 4-6 creamy spots on each wing, underside white (Ref. 3167).
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Gert Boden
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Life Cycle ( 英語 )

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Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449). With no definite egg laying period (Ref. 3167). Distinct pairing with embrace. Young may tend to follow large objects, such as their mother (Ref. 205).
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Morphology ( 英語 )

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Dorsal spines (total): 0; Analspines: 0; Analsoft rays: 0
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Biology ( 英語 )

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Found in offshore shelf waters and on upper slope, mainly around the 100 m line (Ref. 3167). Depth range from 70-275 m (Ref. 03167), and from 463-676 m in eastern Ionian Sea (Ref. 56504). Feed on all kinds of bottom animals (Ref. 3167). 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 8.3-9.2 cm long and 4.6-5.3 cm wide (Ref. 41303, 41251, 41311). Maximum length for female is 117 cm (Ref. 41333).
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Importance ( 英語 )

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fisheries: minor commercial; price category: medium; price reliability: reliable: based on ex-vessel price for this species
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Sandy ray ( 英語 )

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The sandy ray (Leucoraja circularis) or sandy skate[2] is a species of ray in the family Rajidae.[3][4]

Description

Diagram from The fishes of Great Britain and Ireland (1884)

It maximum length is 1.2 m (3 ft 11 in), typical adults measuring 70 cm (2.3 ft). It has a short snout with a spinulose reddish-brown dorsal surface, a tail only slightly longer than body, and a white underside. A distinctive feature is the 4–6 creamy-coloured spots on each wing.[5]

Habitat

The sandy ray lives in the demersal zone of the offshore waters of Western Europe and the Mediterranean Sea, at depths between 70 m (230 ft) and 676 m (2,218 ft).[6] According to the FAO this species should be considered extinct in Mediterranean Sea, but recent records contradict this view.[7]

Behaviour

The sandy ray lays its eggs between August and November and feeds on benthic invertebrates and small bony fish.[8]

References

  1. ^ International), Sonja Fordham (Shark Advocates; Group), Jim Ellis (IUCN SSC Shark Specialist; Group), Rachel Walls (IUCN SSC Shark Specialist; McCully, Sophy (October 30, 2014). "IUCN Red List of Threatened Species: Leucoraja circularis". IUCN Red List of Threatened Species.
  2. ^ Carrier, Jeffrey C.; Musick, John A.; Heithaus, Michael R. (March 9, 2010). Sharks and Their Relatives II: Biodiversity, Adaptive Physiology, and Conservation. CRC Press. ISBN 9781420080483 – via Google Books.
  3. ^ "Leucoraja circularis, Sandy ray : Fisheries".
  4. ^ "sandy-ray-leucoraja-circularis-the-shark-trust". yumpu.com.
  5. ^ "MarLIN - The Marine Life Information Network - Sandy ray (Leucoraja circularis)". www.marlin.ac.uk.
  6. ^ "Leucoraja circularis, Sandy ray : fisheries". www.fishbase.se. Retrieved 2023-02-20.
  7. ^ Guide of Mediterranean Skates and Rays (Leucoraja circularis). Oct. 2022. Mendez L., Bacquet A. and F. Briand. https://ciesm.org/marine/programs/skatesandrays/leucoraja-circularis/
  8. ^ Last, Peter; Naylor, Gavin; Séret, Bernard; White, William; Stehmann, Matthias; Carvalho, Marcelo de (December 1, 2016). Rays of the World. Csiro Publishing. ISBN 9780643109155 – via Google Books.
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Sandy ray: Brief Summary ( 英語 )

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The sandy ray (Leucoraja circularis) or sandy skate is a species of ray in the family Rajidae.

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