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Squalus megalops (Macleay, 1881)

Shortnose spurdog
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Native range | All suitable habitat | Point map | Year 2050
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Squalus megalops   AquaMaps   Data sources: GBIF OBIS
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Image of Squalus megalops (Shortnose spurdog)
Squalus megalops
Picture by Gloerfelt-Tarp, T.


Tonga country information

Common names: [No common name]
Occurrence: native
Salinity: marine
Abundance: | Ref:
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments:
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/tn.html
National Fisheries Authority: http://www.spc.org.nc/coastfish/Countries/Tonga/tonga.htm
Occurrences: Occurrences Point map
Main Ref: Randall, J.E., J.T. Williams, D.G. Smith, M. Kulbicki, G.M. Tham, P. Labrosse, M. Kronen, E. Clua and B.S. Mann, 2003
National Database:

Common names from other countries

Classification / Names Tên thường gặp | Các synonym ( Các tên trùng) | Catalog of Fishes(Giống, Các loài) | ITIS | CoL | WoRMS | Cloffa

Lớp phụ Cá sụn (cá mập và cá đuối) (sharks and rays) > Squaliformes (Sleeper and dogfish sharks) > Squalidae (Dogfish sharks)
Etymology: Squalus: Genus name from Latin 'squalus' meaning shark (Ref. 6885, 27436).
  More on author: Macleay.

Issue
Junior synonym Squalus acutipinnis Regan, 1908 is considered a valid species in Ref. 109601, 130168.

Environment: milieu / climate zone / depth range / distribution range Sinh thái học

Biển gần đáy; Mức độ sâu 30 - 750 m (Ref. 27121), usually 80 - 300 m (Ref. 57911).   Subtropical; 9°C - 23°C (Ref. 57911); 42°N - 60°S, 100°E - 140°W (Ref. 247)

Sự phân bố Các nước | Các khu vực của FAO | Các hệ sinh thái | Những lần xuất hiện | Point map | Những chỉ dẫn | Faunafri

Eastern Indian Ocean: previously considered to be an Australian endemic (Ref. 49645). Eastern Atlantic: confirmed to occur in the Mediterranean (Ref. 93472). Dogfishes presently referred to in current literature as Squalus megalops appear to belong to a complex of similar species. Specimens from the different regions still need to be compared carefully (Ref. 6871).

Length at first maturity / Bộ gần gũi / Khối lượng (Trọng lượng) / Age

Maturity: Lm 57.0, range 49 - 57 cm
Max length : 72.0 cm TL con đực/không giới tính; (Ref. 104718); 89.0 cm TL (female); Tuổi cực đại được báo cáo: 32 các năm (Ref. 93445)

Short description Khóa để định loại | Hình thái học | Sinh trắc học

Các tia vây lưng cứng (tổng cộng) : 2; Tia cứng vây hậu môn: 0. A small dogfish with a short, angular snout and a small mouth almost as wide as the snout is long; body without spots; 1st dorsal fin spine over pectoral fins (Ref. 5578). Bronze-grey above, white below; dorsal fins with black tips and white edges but markings inconspicuous in adults (Ref. 5578).

Sinh học     Tự điển (thí dụ epibenthic)

Found on the outer continental shelves and upper slopes, on or near the bottom (Ref. 31367); sublittoral below 130 m (Ref. 11230). Young mostly pelagic off the outer shelves (Ref. 5578). Aggregations by sex are regularly observed (Ref. 6871). Feeds on bony fishes, shrimps and other crustaceans, cephalopods and other elasmobranchs (Ref. 247). Ovoviviparous (Ref. 205), with 2 to 4 young in a litter (Ref. 247). Gestation period is 2 years (Ref. 36731). Utilized for human consumption, the flesh most appealing dried salted or smoked (Ref. 6871). Also consumed fresh (Ref. 31367). Minimum depth reported from Ref. 6808.

Life cycle and mating behavior Maturities | Sự tái sinh sản | Spawnings | Egg(s) | Fecundities | Ấu trùng

Distinct pairing with embrace (Ref. 205). Ovoviviparous, with 2 to 4 young in a litter. Gestation period is about two years. Size at birth 20-24 cm TL (Ref. 6871).

Main reference Upload your references | Các tài liệu tham khảo | Người điều phối : Compagno, Leonard J.V. | Người cộng tác

Last, P.R. and J.D. Stevens, 1994. Sharks and rays of Australia. CSIRO, Australia. 513 p. (Ref. 6871)

IUCN Red List Status (Ref. 130435)

  Least Concern (LC) ; Date assessed: 02 May 2019

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless




Human uses

Các nghề cá: Tính thương mại; cá để chơi: đúng
FAO(Các nghề cá: species profile; publication : search) | FishSource |

Thêm thông tin

Trophic ecology
Các loại thức ăn
Diet compositions
Food consumptions
Food rations
Các động vật ăn mồi
Ecology
Sinh thái học
Home ranges
Population dynamics
Growths
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversions
Recruitments
Abundances
Life cycle
Sự tái sinh sản
Maturities
Fecundities
Spawnings
Spawning aggregations
Egg(s)
Egg developments
Ấu trùng
Sự biến động ấu trùng
Anatomy
Gill areas
Não bộ
Otoliths
Physiology
Body compositions
Nutrients
Oxygen consumptions
Dạng bơi
Swimming speeds
Visual pigment(s)
Âm thanh của cá
Diseases / Parasites
Toxicities (LC50s)
Genetics
Di truyền
Electrophoreses
Heritabilities
Human related
Aquaculture systems
Các tổng quan nuôi trồng thủy sản
Các giống
Ciguatera cases
Stamps, coins, misc.

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Estimates based on models

Preferred temperature (Ref. 115969): 12.8 - 22.8, mean 17.3 (based on 216 cells).
Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00398 (0.00251 - 0.00631), b=3.07 (2.93 - 3.21), in cm Total Length, based on LWR estimates for this species & Genus-body shape (Ref. 93245).
Mức dinh dưỡng (Ref. 69278):  4.3   ±0.3 se; based on diet studies.
Thích nghi nhanh (Ref. 120179):  Rất thấp, thời gian nhân đôi của chủng quần tối thiểu là hơn 14 năm (tmax = 32; Fec=2).
Fishing Vulnerability (Ref. 59153):  High to very high vulnerability (68 of 100).
Price category (Ref. 80766):   Medium.