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(كوسه ها و سپرماهيان) (sharks and rays) >
Squaliformes (Sleeper and dogfish sharks) >
Squalidae (Dogfish sharks)
Etymology: Squalus: Genus name from Latin 'squalus' meaning shark (Ref. 6885, 27436); mahia: Name from Malagasy 'mahia' meaning skinny or very thin, referring to the particular morphological
features of this species; noun in apposition.
Taxonomic Remarks
Species information for completion.
محیط زیست: محیط زیست / منطقه آب و هوایی / تغييرات عمق / محدوده توزیع
بوم شناسي
دريايي pelagic-oceanic; تغييرات عمق 55 - 500 m (Ref. 116247), usually 202 - 390 m (Ref. 116247). Tropical
Western Indian Ocean: restricted distribution from Socotra Islands and northern Madagascar to Algoa Bay, Eastern Cape in South Africa.
اندازه / وزن / سن
بلوغ: Lm ?  range ? - ? cm
Max length : 50.0 cm TL جنس نر / بدون خواص جنسي; (Ref. 116247); 59.0 cm TL (female)
توصيف مختصر
كليدهاي شناسايي | ريخت شناسي | ريخت ستجي بوسيله انداره گيري
This species is distinguished from its congeners by the following characters: a slender body with a narrow caudal fin, pointed dorsal and ventral caudal tips, and dermal dentils with markedly slender crowns; it is clearly distinct from its regional congeners S. acanthias, S. acutipinnis, Squalus cf. blainvillei, Squalus cf. mitsukurii, S. megalops, by having a ventral caudal lobe which is mostly white with a black caudal blotch near lower caudal origin; differs from S. megalops by having a more elongated first dorsal fin spine, with length 4.9% TL (4.2-5.1%) and corresponding to 0.6 (0.5-0.7) times the height of first dorsal fin in adult specimens (vs. 2.7-3.7% TL, 0.3-0.4 times in S. megalops), slender and upright dorsal fins (vs. wide and low), postventral caudal margins not uniformly white (vs. uniformly white); it differs from S. brevirostris and S. acanthias by its greater preoral length, its length 9.5-11.1% TL (vs. 8.5-9.1% TL for brevirostris and 8.3-9.2% TL for acanthias); differs from S. brevirostris and S. crassispinus by the thickness of its first dorsal fin spine of adults, base length 0.8-1.0% TL (vs. 0.5-0.7% TL for brevirostris and 1.1-1.3% TL for crassispinus); adults of Squalus mahia differs from S. acanthias and S. crassispinus by its first dorsal fin anterior margin length 10.5-12.2% TL (vs. 6.8-9.8% TL for acanthias and 12.6-12.9% TL for crassispinus); differs from S. acanthias and S. margaretsmithae by its greater prespiracular length. 12.4-13.7% TL (vs. 10.7-12.0% TL for acanthias and 11.5-12.3% TL for margaretsmithae); differs from S. chloroculus, S. edmundsi, S. lalannei, S. mitsukurii, S. montalbani, S. nasutus by having a smaller snout with prenarial length shorter than distance from nostril to upper labial furrow, and unicuspid and lanceolate dermal dentils (vs. prenarial length greater than distance from nostril to upper labial furrow, and tricuspid and rhomboid dermal dentils) (Ref. 116247).
Body shape (shape guide): elongated.
A mesopelagic species, where its distribution indicates that it is a warmer-water species
associated with the Mozambique and Agulhas currents (Ref. 116247).
چرخه زندگی و رفتار جفتگیری
بلوغ | تولید مثل | تخم ریزی | تخم ها | باروری | توزاد ( لارو)
Viana, S.T. d. F.L., M.W. Lisher and M.R. de Carvalho, 2017. Two new species of short-snouted dogfish sharks of the genus Squalus Linnaeus, 1758, from southern Africa (Chondrichthyes: Squaliformes: Squalidae). Mar. Biodiv. 1-28. (Ref. 116247)
وضعيت در فهرست قرمز IUCN (Ref. 130435: Version 2025-2 (Global))
خطر برای انسان ها
Harmless
استفاده انسانی
ماهي گيري – شيلات: علاقه بالقوه
ابزارها
گزارش های ويژه
بارگيری XML
منابع اينترنتي
تخمینها بر اساس مدلها
شاخص تنوع فیلوژنتیکی (مرجع 82804) |
PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.00355 (0.00168 - 0.00751), b=3.09 (2.92 - 3.26), in cm total length, based on LWR estimates for this Genus-body shape (Ref. 93245). |
سطح تروفیک (مرجع 69278) |
4.0 ±0.4 se; based on size and trophs of closest relatives |
جهندگی (مرجع 120179) |
پايين ، كم, كمينه زمان لازم براي دو برابر شدن جمعيت 5/4 – 14 سال (Preliminary K or Fecundity.). |
آسیبپذیری ماهیگیری (Ref. 59153) |
High vulnerability (55 of 100). 🛈 |