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); francisci: Of Francisco, probably referring to San Francisco (city and/or bay), California, USA (although its range does not extend that far north of its type locality, Monterey Bay). (See ETYFish).
More on author: Girard.
Environment: milieu / climate zone / depth range / distribution range
বাস্তুসংস্থান
সামুদ্রিক তলদেশ বিহারী; গভীরতার পরিসীমা 0 - 152 m (Ref. 106604), usually 2 - 11 m (Ref. 9253). Subtropical; 37°N - 15°S, 124°W - 75°W
Eastern Pacific: central California, USA to the Gulf of California, and probably Ecuador and Peru.
Length at first maturity / আকৃতি / ওজন / Age
Maturity: Lm ?, range 59 - ? cm
Max length : 122 cm TL পুরুষ/ লিঙ্গ অনিধর্ারিত ; (Ref. 247); common length : 97.0 cm TL পুরুষ/ লিঙ্গ অনিধর্ারিত ; (Ref. 247); সর্বোচ্চ উলি্ল্লখিত বয়স : 12 বৎসর (Ref. 72467)
Sluggish, nocturnal, and mostly solitary species. Inhabit rocky bottoms, kelp beds, sandy draws between rocks, on sand flats, deep crevices and small caves and also large underwater caverns. Adults tend to return to the same resting place every day (Ref. 43278). Feed on benthic invertebrates, especially sea urchins, crabs and probably abalone, also fishes. Oviparous (Ref. 50449). May bite back when harassed. Has broad muscular paired fins used as limbs for clambering on the bottom. Catch reduced to fish meal; fin spines used in production of jewels.
Oviparous (Ref. 205). Distinct pairing with embrace (Ref. 205). Courtship starts when the male chases the female, then when both are ready, they drop to the bottom (Ref. 43278). During courtship and prior to copulation, the male bites and wraps its body to the female pectoral fin, body, tail, and gills (Ref. 51127, 49562). The male then inserts a single clasper in the female's cloaca; copulation lasts 30 to 40 min. After one or two weeks later, the eggs are laid in about 11 to 14 intervals for 4 months which were deposited under rocks or in crevices, as was observed in nature. In captivity, the female drops the eggs on the bottom where the contents of the egg cases maybe eaten by these sharks; the eggs are hatched in 7 to 9 months. The young begin to feed one month after hatching (Ref. 43278).
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)
Human uses
মৎস্য: গৌণ বাণিজ্যিক ; মৎস্যাধার / এ্যাকুয়ারিয়াম : পাবলিক এ্যাকুয়ারিয়াম
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ইন্টারনেট সুত্র
Estimates based on models
Preferred temperature (Ref.
123201): 15.9 - 23.7, mean 21.4 °C (based on 159 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5059 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00437 (0.00232 - 0.00821), b=3.15 (2.97 - 3.33), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
ট্রফিক পর্যায়ে (Ref.
69278): 3.2 ±0.3 se; based on diet studies.
স্থিতিস্থাপক (Ref.
120179): নিম্ন/ , সর্বনিম্ন প্রজন দ্বিগুনের সময় ৪.৪-১৪ বৎসর (Fec=20).
Fishing Vulnerability (Ref.
59153): High to very high vulnerability (73 of 100).
Nutrients (Ref.
124155): Calcium = 21.1 [4.1, 95.1] mg/100g; Iron = 0.68 [0.18, 2.01] mg/100g; Protein = 19 [17, 21] %; Omega3 = 0.201 [0.090, 0.442] g/100g; Selenium = 28.1 [8.6, 83.2] μg/100g; VitaminA = 7.36 [2.35, 22.58] μg/100g; Zinc = 0.646 [0.318, 1.171] mg/100g (wet weight);
