Malta country information

Common names: Boll, Boll tork, Boll vjola
Occurrence: native
Salinity: marine
Abundance: | Ref:
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments: Also Ref. 3169.
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/mt.html
National Fisheries Authority:
Occurrences: Occurrences Point map
Main Ref: Lanfranco, G.G., 1996
National Database:

Common names from other countries

Pastenague violette, Raya-látigo violeta, Pelagic sting-ray, ... more

Classification / Names Populärnamn | synonymer | Catalog of Fishes(Släkte, Arter) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (hajar och rockor) (sharks and rays) > Myliobatiformes (Stingrays) > Dasyatidae (Stingrays) > Dasyatinae
Etymology: Pteroplatytrygon: Greek, pteron = wing, fin + Greek,platys = flat + Greek, trygon = a sting ray (Ref. 45335); violacea: From the Latin 'viola' meaning violet..
More on author: Bonaparte.

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

marina; djupintervall 1 - 381 m (Ref. 58302), usually 1 - 100 m (Ref. 55209). Subtropical; 52°N - 50°S, 180°W - 180°E (Ref. 55209)

Utbredning Länder | FAO områden | Ekosystem | Förekomster | Point map | Utplanteringar | Faunafri

Probably cosmopolitan in tropical and subtropical seas. Eastern Pacific: Reported from Vancouver (Ref. 11980), from California (USA), Baja California (Mexico) to Chile, and the Galapagos Is. (Ref. 9068). Western Atlantic (Ref. 7251). Eastern Atlantic: Southeastern coasts of the Mediterranean and off Sicily; Reported from Cape Verde (Ref. 34514). Indian Ocean.

Length at first maturity / Size / Vikt / Age

Maturity: L_m 45.0, range 40 - 50 cm
Max length : 96.0 cm WD hane/ej könsbestämd; (Ref. 48844); common length : 80.0 cm WD hane/ej könsbestämd; (Ref. 9254)

Short description Bestämningsnycklar | Morfologi | Morfometri

A thick, dark stingray with a broadly rounded snout and an angular pectoral disc; tail less than twice body length with a long lower caudal finfold ending far in front of tail tip, but with no upper finfold; disc without thorns; usually 1 extremely long sting on tail; eyes do not protrude (Ref. 5578). Uniformly violet, purple, or dark blue-green dorsally and ventrally (Ref. 3263). No prominent markings (Ref. 3263).

Found in open, tropical and warm temperate waters usually in the first 100 m. Possibly the only totally pelagic member of the family (Ref. 6871). Feeds on coelenterates (including medusae), squid, decapod crustaceans, and fish. Ovoviviparous (Ref. 50449). Venomous spine on tail. Common catch of the pelagic tuna (and shark) longline and gillnet fisheries (drift, Ref. 75025) operating throughout the region (Ref. 58048); also by purse-seine and bottom trawls (Ref. 75025). Utilized for its meat and sometimes cartilage (Ref.58048). Total length 110 TL (80 cm WD) (Ref. 9254).

Life cycle and mating behavior Maturities | Reproduktion | Spawnings | Egg(s) | Fecundities | Larver

Exhibit ovoviparity (aplacental viviparity), with embryos feeding initially on yolk, then receiving additional nourishment from the mother by indirect absorption of uterine fluid enriched with mucus, fat or protein through specialised structures (Ref. 50449). Distinct pairing with embrace (Ref. 205). With 2 (Ref.58048) to 9 young born at 15-25 cm WD (Ref. 26346); after a gestation period of 4 months (Ref.58048).

Main reference Upload your references | referenser | Koordinator : McEachran, John | Medarbetare

Compagno, L.J.V., 1999. Checklist of living elasmobranchs. p. 471-498. In W.C. Hamlett (ed.) Sharks, skates, and rays: the biology of elasmobranch fishes. Johns Hopkins University Press, Maryland. (Ref. 35766)

IUCN Red List Status (Ref. 130435)

Least Concern (LC) ; Date assessed: 09 November 2018

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Venomous (Ref. 9254)

Human uses

Fiskeri: kommersiell

FAO(Publication : search) | FishSource |

Ytterligare information

Trophic ecology
Födoslag
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Food consumptions
Food rations
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Ecology
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Population dynamics
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Length-weight rel.
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Life cycle
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Anatomy
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Visual pigment(s)
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Genetics
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Bilder

References
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Estimates based on models

Preferred temperature (Ref. 115969): 12 - 28.6, mean 24.8 (based on 5148 cells).

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00646 (0.00265 - 0.01571), b=3.06 (2.86 - 3.26), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).

Trofisk nivå (Ref. 69278): 4.4 ±0.54 se; based on food items.

Resiliens (Ref. 120179): Mycket låg, lägsta populationsfördubblingstid mer än 14 år (K=0.18 (captivity); Fec=1-9 (could probably have 2 litters per year)).

Fishing Vulnerability (Ref. 59153): High vulnerability (63 of 100).

Price category (Ref. 80766): Low.

Pteroplatytrygon violacea (Bonaparte, 1832)