分类 / Names
俗名 | 同种异名 | Catalog of Fishes(属, 种) | ITIS | CoL | WoRMS | Cloffa
Elasmobranchii
板鳃亚纲 (鲨鱼与 鱼) (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..
Environment: milieu / climate zone / depth range / distribution range
生态学
海洋; 深度上下限 55 - 500 m (Ref. 116247), usually 202 - 390 m (Ref. 116247).
Western Indian Ocean: restricted distribution from Socotra Islands and northern Madagascar to Algoa Bay, Eastern Cape in South Africa.
大小 / 重量 / 年龄
Maturity: Lm ? range ? - ? cm
Max length : 50.0 cm TL 雄鱼/尚未辨别雌雄; (Ref. 116247); 59.0 cm TL (female)
简单描述
型态特徵 | 形态测量图
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).
A mesopelagic species, where its distribution indicates that it is a warmer-water species
associated with the Mozambique and Agulhas currents (Ref. 116247).
Life cycle and mating behavior
成熟度 | 繁殖 | 产卵场 | 卵 | 孕卵数 | 仔鱼
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)
人类利用
更多信息
俗名同种异名新陈代谢捕食者生态毒物学繁殖成熟度产卵场产卵群集孕卵数卵卵的发育
年龄范围成长体长-体重体长-体长体长-频率形态测量图型态特徵仔鱼稚鱼动力学入添量丰度BRUVS
参考文献养殖养殖信息品种遗传学Electrophoreses遗传率疾病加工NutrientsMass conversion
合作者照片Stamps, Coins Misc.声音神经毒速度泳型鳃区Otoliths脑重体重比眼睛色素
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00339 (0.00162 - 0.00707), b=3.10 (2.93 - 3.27), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
营养阶层 (Ref.
69278): 4.2 ±0.3 se; based on size and trophs of closest relatives
回复力 (Ref.
120179): 低的, 最小族群倍增时间4.5 - 14 年 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Moderate vulnerability (44 of 100).
