ইলাসমোব্রাঙ্কি (হাঙ্গর এবং রে) (sharks and rays) >
Rhinopristiformes (Shovelnose rays) >
Pristidae (Sawfishes)
Etymology: Anoxypristis: Greek, ana = up + Greek, oxy = sharp, pointed + Greek, pristis = saw (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
বাস্তুসংস্থান
সামুদ্রিক; স্বাদু পানি; ঈষৎ লোনা সমুদতলে ভাসমান বেনথোপেলাজিক; এ্যামফিড্রমাস (Ref. 51243); গভীরতার পরিসীমা 0 - 40 m (Ref. 9859), usually ? - 40 m (Ref. 55270). Tropical; 43°N - 20°S, 30°E - 160°E (Ref. 114953)
Indo-West Pacific: widespread, Red Sea to eastern Australia, north to Japan.
Length at first maturity / আকৃতি / ওজন / Age
Maturity: Lm 264.0, range 246 - 282 cm
Max length : 470 cm TL পুরুষ/ লিঙ্গ অনিধর্ারিত ; (Ref. 9859)
Greyish above, pale below; fins usually pale. Body shark-like, pectoral fins distinct; head flattened, with a blade-like snout bearing 18-22 pairs of lateral teeth; blade slender, not tapering distally. Nostrils very narrow with small nasal flaps. Rostral teeth short, flattened, broadly triangular, lacking a groove along posterior margins; no teeth on basal quarter of blade. Adults with widely spaced denticles, young with naked skin.
Found inshore, often in river deltas and estuaries; penetration well up rivers needs confirmation (Ref. 9859). Common in sheltered bays with sandy bottoms. More active swimmer than other sawfishes (Ref. 114953). Feeds on small fish, cuttlefish (Ref. 9859) and small benthic invertebrates such as prawns (Ref. 114953). Ovoviviparous (Ref. 50449). Most fecund sawfish, reported to reach sexual maturity at 2-3 years (Ref. 114953). Females have litters of approximately 12 pups (Ref. 114953). Generally harmless but its saw-like snout may cause serious injury when caught: it is known thrash violently and vigorously (Ref. 9859). Caught for its flesh and liver (which is rich in oil) in some parts of Asia (Ref. 6871). Maximum lengths of up to 610 cm TL are based on unconfirmed reports (Ref. 9859).
Life cycle and mating behavior
Maturities | প্রজনন | Spawnings | Egg(s) | Fecundities | শুককীট
Ovoviviparous. Litter size from 6 to 23, young born in the spring (Ref. 9859).
Mould, B., 1994. A world list of rays. The scientific nomenclature and distribution of the recent Batoidea (Batoidea, Elasmobranchii, Chondrichthyes). University of Nottingham, [UK]. 82 p. (Ref. 8630)
IUCN Red List Status (Ref. 130435)
Human uses
মৎস্য: বাণিজ্যিক; শিকারযোগ্য মাছ: হঁ্যা
হাতিয়ার
Special reports
Download XML
ইন্টারনেট সুত্র
Estimates based on models
Preferred temperature (Ref.
123201): 24.6 - 29.1, mean 28.2 °C (based on 1982 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 1.0078 [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): 4.5 ±0.62 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): Very high vulnerability (90 of 100).
