ইলাসমোব্রাঙ্কি (হাঙ্গর এবং রে) (sharks and rays) >
Carcharhiniformes (Ground sharks) >
Carcharhinidae (Requiem sharks)
Etymology: Negaprion: negatus (L.), to deny; prion (Gr.), saw, referring to lack of saw-like serrations on teeth cusps. (See ETYFish); brevirostris: Latin for having a wide forehead, referring to very broad, depressed head [treated as a junior synonym of N. brevirostris by some workers]. (See ETYFish).
More on author: Poey.
Environment: milieu / climate zone / depth range / distribution range
বাস্তুসংস্থান
সামুদ্রিক; ঈষৎ লোনা রীফ সংশ্লিষ্ট; মহাসাগরে বিচরনক্ষম (Ref. 51243); গভীরতার পরিসীমা 0 - 92 m (Ref. 244). Subtropical; 45°N - 33°S, 114°W - 14°E (Ref. 55192)
Western Atlantic: New Jersey, USA to southern Brazil, including the Gulf of Mexico, the Bahamas, and the Caribbean; also in Gulf of Mexico (Ref. 26938). Northeast Atlantic: Senegal, Côte d'Ivoire and probably wide-ranging off West Africa, but this requires confirmation. Eastern Pacific: southern Baja California, Mexico and the Gulf of California to Ecuador.
Length at first maturity / আকৃতি / ওজন / Age
Maturity: Lm ?, range 239 - ? cm
Max length : 340 cm TL পুরুষ/ লিঙ্গ অনিধর্ারিত ; (Ref. 26938); common length : 240 cm TL পুরুষ/ লিঙ্গ অনিধর্ারিত ; (Ref. 5217); সবের্াচ্চ প্রকাশিত ওজন : 183.7 kg (Ref. 40637); সর্বোচ্চ উলি্ল্লখিত বয়স : 25 বৎসর (Ref. 31395)
A brownish shark with yellow overtones but no conspicuous markings. Large second dorsal fin nearly same size as first dorsal (Ref. 26938).
Occurs on continental and insular shelves, frequenting mangrove fringes, coral keys, docks, sand or coral mud bottoms, saline creeks, enclosed bays or sounds, and river mouths. May enter fresh water. Occasionally moves into the open ocean, near or at the surface, apparently for purposes of migration. May rest motionless on the bottom (Ref. 9710). May occur singly or in small groups. Feeds mainly on fish but also takes crustaceans and mollusks. Viviparous, with 4 to 17 young in a litter. Size at birth 60 to 65 cm. Has been involved in several attacks on people. Meat is utilized for human consumption, hides for leather, fins for shark-fin soup base, liver oil for vitamins, and carcasses for fish meal. Marketed fresh, dried-salted and frozen (Ref. 9987).
Distinct pairing with embrace (Ref. 205). Viviparous, placental (Ref. 50449), with 5 to 17 embryos (Ref. 9253). Both male and female during precopulatory and courtship swim with body axes in parallel (Ref. 49562, 51112). During copulation, the pair performs coordinated swimming (Ref. 49562, 51112).
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)
Human uses
মৎস্য: বাণিজ্যিক; শিকারযোগ্য মাছ: হঁ্যা
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ইন্টারনেট সুত্র
Estimates based on models
Preferred temperature (Ref.
123201): 21.9 - 28, mean 25.6 °C (based on 714 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00490 (0.00257 - 0.00934), b=3.11 (2.95 - 3.27), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
ট্রফিক পর্যায়ে (Ref.
69278): 4.3 ±0.5 se; based on diet studies.
Generation time: 9.2 ( na - na) years. Estimated as median ln(3)/K based on 1
growth studies.
স্থিতিস্থাপক (Ref.
120179): অত্যন্ত কম , সর্বনিম্ন প্রজন দ্বিগুনের সময় ১৪ বৎসর (K=0.54(?); tm=12.7; tmax=25; Fec = 4-17; rmax = 0.012).
Fishing Vulnerability (Ref.
59153): High to very high vulnerability (73 of 100).
Climate Vulnerability (Ref.
125649): Very high vulnerability (76 of 100).
Nutrients (Ref.
124155): Calcium = 2.73 [0.51, 15.56] mg/100g; Iron = 0.307 [0.074, 0.937] mg/100g; Protein = 22.4 [20.0, 24.6] %; Omega3 = 0.145 [0.049, 0.381] g/100g; Selenium = 15.2 [4.5, 49.2] μg/100g; VitaminA = 29.7 [7.6, 116.9] μg/100g; Zinc = 0.449 [0.209, 0.900] mg/100g (wet weight);
