Issue
This species was not reported since the 19th century in the Mediterranean Sea. An award will be granted by the CIESM to any documented, reliable / verifiable evidence (published paper / Ph.D thesis / photo) reporting the species after that date (Ref. 116564).
Environment: milieu / climate zone / depth range / distribution range
বাস্তুসংস্থান
সামুদ্রিক; স্বাদু পানি; ঈষৎ লোনা তলদেশ বিহারী; মহাসাগরে বিচরনক্ষম (Ref. 51243); গভীরতার পরিসীমা 25 - ? m (Ref. 114953). Subtropical; 35°N - 40°S, 120°W - 160°E (Ref. 114953)
Circumglobally in tropical and subtropical waters, entering estuaries and littoral lagoons and ascending river courses (Ref. 81284, 81624). Western Atlantic: Florida and Louisiana, USA to Brazil (Ref. 7251); eastern Atlantic: Portugal to Angola, including the western Mediterranean Sea (Ref. 4429; no report since the 19th century [Ref. 116564] ); western Pacific: northern Australia, from western Australia to Queensland (Ref. 7300); eastern Pacific: Gulf of California to Ecuador (Ref. 4429). In freshwater it can be found in rivers of West Africa (Ref. 81284), Ogowe River (Ref. 81284) and the Congo River estuary (Ref. 377, 81284).
Length at first maturity / আকৃতি / ওজন / Age
Maturity: Lm 300.0, range 300 - 300 cm
Max length : 750 cm TL পুরুষ/ লিঙ্গ অনিধর্ারিত ; (Ref. 57708); common length : 250 cm TL পুরুষ/ লিঙ্গ অনিধর্ারিত ; (Ref. 4429); সর্বোচ্চ উলি্ল্লখিত বয়স : 30 বৎসর (Ref. 57533)
Diagnosis: Rostral blade with 20 or fewer pairs of rostral spines (Ref. 81624).
A euryhaline species (Ref. 57533). Inhabits inshore coastal waters to moderate depth, also around off lying islands. Found also in estuaries, lagoons, river mouths, and even freshwater. Feeds on fishes and bottom-living animals. Ovoviviparous. Apparently can reproduce in freshwater (Ref. 57533). Freshwater populations occur to about 750 km up Amazon River; populations in Lake Nicaragua may be non-migratory (Ref. 7251). Reaches sexual maturity at 8-10 years and females have litters of approximately 1-13 pups. Young spend much of their early life in rivers up to 400 km from the sea (Ref. 114953).
Life cycle and mating behavior
Maturities | প্রজনন | Spawnings | Egg(s) | Fecundities | শুককীট
Ovoviviparous, embryos feed solely on yolk (Ref. 50449).
Stehmann, M., 1990. Pristidae. p. 51-54. In J.C. Quero, J.C. Hureau, C. Karrer, A. Post and L. Saldanha (eds.) Check-list of the fishes of the eastern tropical Atlantic (CLOFETA). JNICT, Lisbon; SEI, Paris; and UNESCO, Paris. Vol. 1. (Ref. 4429)
IUCN Red List Status (Ref. 130435)
Threat to humans
Harmless
Human uses
মৎস্য: গৌণ বাণিজ্যিক
হাতিয়ার
Special reports
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ইন্টারনেট সুত্র
Estimates based on models
Preferred temperature (Ref.
123201): 20.1 - 29.1, mean 27.8 °C (based on 1796 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5234 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00501 (0.00198 - 0.01270), b=3.05 (2.83 - 3.27), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
ট্রফিক পর্যায়ে (Ref.
69278): 4.0 ±0.60 se; based on food items.
স্থিতিস্থাপক (Ref.
120179): নিম্ন/ , সর্বনিম্ন প্রজন দ্বিগুনের সময় ৪.৪-১৪ বৎসর (tmax=44; Fec=1-20;).
Fishing Vulnerability (Ref.
59153): Very high vulnerability (79 of 100).
Nutrients (Ref.
124155): Calcium = 8.73 [1.69, 40.68] mg/100g; Iron = 0.523 [0.130, 1.505] mg/100g; Protein = 20.3 [18.1, 22.3] %; Omega3 = 0.173 [0.070, 0.432] g/100g; Selenium = 37 [10, 113] μg/100g; VitaminA = 2.11 [0.72, 6.06] μg/100g; Zinc = 0.367 [0.179, 0.703] mg/100g (wet weight);
