Squatina africana, African angelshark : fisheries, gamefish

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Squatina africana Regan, 1908

African angelshark
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Squatina africana
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分類 / Names 共通名の | 類義語 | Catalog of Fishes(部類, ) | ITIS | CoL | WoRMS | Cloffa

板鰓亜鋼(サメとエイ類) (sharks and rays) > Squatiniformes (Angel sharks) > Squatinidae (Angel sharks)
Etymology: Squatina: Latin for skate, which angel sharks superficially resemble, presumably tautonymous with Squalus squatina Linnaeus 1758 (no species mentioned). (See ETYFish);  africana: ana- (L.), belonging to: Africa, referring to distribution from South Africa to Mozambique, Tanzania and Madagascar. (See ETYFish).
More on author: Regan.

Environment: milieu / climate zone / depth range / distribution range 生態学

底生の; 深さの範囲 ? - 494 m (Ref. 5578), usually 60 - 300 m (Ref. 5578). Subtropical; 4°S - 32°S

分布 国々 | 国連食糧農業機関の区域 | エコシステム | 事件 | Point map | 導入 | Faunafri

Western Indian Ocean: tropical and warm temperate waters from Tanzania to the eastern Cape coast of South Africa.

Length at first maturity / サイズ / 重さ / 年齢

Maturity: Lm 91.5, range 90 - 93 cm
Max length : 84.0 cm TL オス/雌雄の選別がない; (Ref. 128961); 108.0 cm TL (female)

簡単な記述 形態学 | 形態計測学

This medium-sized angel shark species (maximum size 122.0 or possibly 130.0 cm TL) posess the following characters: no median row of scute-like denticles on the trunk; anterior nasal flap has two lateral, elongate barbels and a medial rectangular barbel, the ventral margin of medial barbel is slightly fringed, but that of lateral barbels are almost smooth; posterior nasal flap without additional barblet; concave between eyes; pectoral-pelvic space 6.0-10.2% TL; pectoral-fin apex is angular; pelvic-fin free rear tips do not reach level of first dorsal-fin origin; tail moderately long, its length from cloaca 51.2-53.2% TL; pectoral fins are moderately long, length 31.8-35.6% TL; dorsal fins are not lobe-like; first dorsal-fin base is somewhat longer than second dorsal-fin base; caudal fin of adults with angular apices; monospondylous centra 46-49; diplosondylous precaudal centra 58-62; total precaudal centra 104-111; total vertebral centra 134-143; pectoral-fin skeleton is with propterygium articulating with three radials. Colouration: dorsal medium to dark brown, reddish-brown or grayish, with a variable pattern of numerous light and dark reddish spots and blotches, marbled with brownish reticulations and partially forming symmetrical dark bands or saddles (Ref. 128961).

生物学     用語集 (例 epibenthic)

Found on the continental shelf and uppermost slope, from the surf line close inshore to 494 m depth (Ref. 247). Feeds on bony fish, squid and octopus (Ref. 247). Ovoviviparous (Ref. 50449), with about 7 to 11 young in a litter (Ref. 247). Largest juvenile males measured with clearly immature claspers are 45.3 cm TL (ZMH 26100) and 50.3 cm TL (MNHN-IC-1987-1265) while the largest female examined is 94.0 cm TL (SAIAB 187381) and possibly an adult; while small female specimens of 29.3 cm TL (ZMMU P-14844), 30.9 cm TL (ZMH 123064), and 38.5 cm TL (MNHN-IC-1988-0359) mm TL are clearly juvenile (Ref. 128961). Sometimes caught by surf anglers (Ref. 6588).

Life cycle and mating behavior 成熟 | 繁殖 | 放精 | | 生産力 | 幼生

Ovoviviparous, with about 7 to 11 young in a litter. Size at birth between 28 and 34 cm. Embryos feed solely on yolk (Ref. 50449).

主な参考文献 Upload your references | 参考文献 | コーディネーター : Compagno, Leonard J.V. | 協力者

Weigmann, S., D.F.B. Vaz, K.V. Akhilesh, R.H. Leeney and G.J.P. Naylor, 2023. Revision of the western Indian ocean angel sharks, genus Squatina (Squatiniformes, Squatinidae), with description of a new species and redescription of the African angel shark Squatina africana Regan, 1908. Biology 2023, 12(77):975. (Ref. 128961)

IUCNのレッドリストの状況は (Ref. 130435)

  絶滅危惧に近い (NT) (A2d); Date assessed: 15 July 2017

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

人間に対する脅威

  Traumatogenic





Human uses

水産業: 食糧水産; ゲームフィッシュ: はい
FAO - 水産業: 種の外形; Publication: search | FishSource |

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Estimates based on models

Preferred temperature (Ref. 123201): 14 - 24.8, mean 18.2 °C (based on 68 cells).
Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00479 (0.00258 - 0.00888), b=3.03 (2.86 - 3.20), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref. 93245).
栄養段階 (Ref. 69278):  4.2   ±0.5 se; based on diet studies.
回復力 (Ref. 120179):  非常に低い, 14年以上の倍増期間の最小個体群 (Fec=7).
Fishing Vulnerability (Ref. 59153):  High vulnerability (65 of 100).
価格帯 (Ref. 80766):   Medium.