ইলাসমোব্রাঙ্কি (হাঙ্গর এবং রে) (sharks and rays) >
Heterodontiformes (Bullhead and horn sharks) >
Heterodontidae (Bullhead, horn, or Port Jackson sharks)
Etymology: Heterodontus: heteros (Gr.), different; odontos (Gr.), tooth, referring to pointy teeth (for clutching prey) at front of jaws, different than rounded molar-like teeth (for grinding hard-shelled invertebrates) at the back. (See ETYFish); zebra: Referring to 12 narrow brown or black zebra-like stripes on body. (See ETYFish).
More on author: Gray.
Environment: milieu / climate zone / depth range / distribution range
বাস্তুসংস্থান
সামুদ্রিক রীফ সংশ্লিষ্ট; গভীরতার পরিসীমা 0 - 200 m (Ref. 6871). Subtropical; 40°N - 20°S, 103°E - 155°E
Western Pacific: Japan to northwestern Australia (Ref. 6871) and Queensland.
Length at first maturity / আকৃতি / ওজন / Age
Maturity: Lm ?, range 84 - ? cm
Max length : 125 cm TL পুরুষ/ লিঙ্গ অনিধর্ারিত ; (Ref. 2334)
পৃষ্ঠীয় কাঁটা (মোট ): 2; পৃষ্ঠীয় নরম পাখনা দন্ড (মোট ): 0; পায়ূ কাঁটা 0; পায়ূর নরম পাখনা্তুন্ড: 0. The Zebra bullhead shark, Heterodontus zebra, has a large blunt head, low supra-orbital crest gradually sloping behind eyes, dorsal fin spines, anal fin, and zebra-pattern of dark, narrow vertical bands on a pale background (Ref. 9838; 6871). As characteristic of members of the family, caudal fin with a moderately long dorsal lobe and moderately long ventral lobe, the latter shorter than the dorsal lobe, vertebral axis raised into caudal-fin lobe (Ref.9838).
A common but little-known shark found on the continental and insular shelves in depths down to at least 50 m (Ref. 247, 11230) in the South China Sea, but deeper and in 150 - 200 meters off Western Australia (Ref. 43278). Probably feeds on bottom invertebrates and small fishes (Ref. 6871). Oviparous (Ref. 247).
Life cycle and mating behavior
পরিপক্কতা | প্রজনন | ডিম ছাড়া | ডিমসমূহ | ডিম্বধারন ক্ষমতা | শুককীট
Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449). Distinct pairing with embrace (Ref. 205). Lays auger type eggs (about 12-18cm, 4.7-7 inches long) among rocks & kelp, often with more than female using same oviposition site, with as many eggs found in a single nest; female lay 2 eggs at a time, from spring to late summer in Japan, 6-12 times during a single spawning season. Eggs hatch in 1 year. Hatch at 18 cm (7 inches), max length at 1.2m (3.9 ft.). During courtship, male grasps pectoral fin of female & wraps posterior part of body under her so single clasper can be inserted into her cloaca. In several mating bouts observed, copulation lasted as long as 15 minutes (Ref. 12951).
Compagno, L.J.V., 2001. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Vol. 2. Bullhead, mackerel and carpet sharks (Heterodontiformes, Lamniformes and Orectolobiformes). FAO Spec. Cat. Fish. Purp. 1(2):269 p. FAO, Rome. (Ref. 43278)
IUCN Red List Status (Ref. 130435)
Threat to humans
Traumatogenic
Human uses
মৎস্য: গৌণ বাণিজ্যিক ; মৎস্যাধার / এ্যাকুয়ারিয়াম : সম্ভাবনাময়
আরো তথ্য
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ইন্টারনেট সুত্র
Estimates based on models
Preferred temperature (Ref.
123201): 15.4 - 26.6, mean 21.8 °C (based on 223 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5059 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00380 (0.00166 - 0.00872), b=3.15 (2.95 - 3.35), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
ট্রফিক পর্যায়ে (Ref.
69278): 4.0 ±0.66 se; based on food items.
স্থিতিস্থাপক (Ref.
120179): নিম্ন/ , সর্বনিম্ন প্রজন দ্বিগুনের সময় ৪.৪-১৪ বৎসর (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153): High to very high vulnerability (75 of 100).
