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Carcharhiniformes (Ground sharks) >
Dichichthyidae ()
Etymology: Dichichthys: Name from the combination of the Greek 'dicho'- meaning 'to branch in two' and 'ichthys' for 'fish', with this genus being intermediate between the Galeus-Parmaturus complex and Apristurus; melanobranchus: melanos (Gr.), black; branchos (Gr.), gill, referring to blackish color on gill septa (See ETYFish).
Environment: milieu / climate zone / depth range / distribution range
البيئة
بحري قاعية المعيشة; نطاق العمق 540 - 810 m (Ref. 244). Deep-water; 21°N - 18°N
Northwest Pacific: known from only 3 specimens taken in the South China Sea. Collected less than a degree north of the northwestern boundary of the Western Central Pacific (Ref. 11146).
الحجم / وزن / العمر
Maturity: Lm ? range ? - ? cm
Max length : 85.0 cm TL (female)
الأشواك الظهرية (المجموع) : 0; شوكة شرجية: 0. Light brown with distal parts and anterior margins of fins, snout, nostrils, and gills blackish brown in young, possibly uniform blackish brown in adults (Ref. 11146).
A poorly known deep-water bottom-dwelling catshark found on mud bottoms of the upper continental slopes (Ref. 11146). Oviparous (Ref. 50449).
Life cycle and mating behavior
النضج | التكاثر | وضع البيض | بيض | الخصوبة | Larvae
Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449).
Compagno, L.J.V., 1984. FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Rome: FAO. (Ref. 244)
IUCN Red List Status (Ref. 130435: Version 2024-1)
استخدامات بشرية
مصائد: غير ذات اهمية
أدوات
تقارير خاصة
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مصادر علي الأنترنت
Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5010 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
مستوى غذائي (Ref.
69278): 4.0 ±0.5 se; based on size and trophs of closest relatives
المرونه (Ref.
120179): منخفض, الحد الزمني الأدني لتضاعف عدد أفراد المجتمع 4.5-14 سنة (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153): Moderate to high vulnerability (54 of 100).
