ইলাসমোব্রাঙ্কি (হাঙ্গর এবং রে) (sharks and rays) >
Rhinopristiformes (Shovelnose rays) >
Pristidae (Sawfishes)
Etymology: Pristis: Greek, pristis = saw (Ref. 45335).
Issue
Synonym of Pristis pristis (Linnaeus, 1758) according to Faria et al., 2012 (Ref. 93006:11) and Weigmann, 2016 (Ref. 106604); status confirmed by William White (pers. Comm., Feb 2016).
Environment: milieu / climate zone / depth range / distribution range
বাস্তুসংস্থান
সামুদ্রিক; স্বাদু পানি; ঈষৎ লোনা তলদেশ বিহারী; এ্যামফিড্রমাস (Ref. 51243); গভীরতার পরিসীমা 0 - 10 m (Ref. 27000). Tropical; 22°N - 39°S, 20°E - 154°E
Indo-West Pacific: East Africa to New Guinea, north to the Philippines and Viet Nam, south to Australia. Also Atlantic and eastern Pacific if Pristis perotteti and Pristis zephyreus are synonymized with this species. The original description of Pristis microdon did not give a locality, but most authors have used the name Pristis microdon for the Indo-West Pacific sawfishes of this species group as contrasted from the Atlantic Pristis perotteti and the eastern Pacific Pristis zephyreus.
Length at first maturity / আকৃতি / ওজন / Age
Maturity: Lm 270.0, range 240 - 300 cm
Max length : 700 cm TL পুরুষ/ লিঙ্গ অনিধর্ারিত ; (Ref. 58048); common length : 500 cm TL পুরুষ/ লিঙ্গ অনিধর্ারিত ; (Ref. 2683); সবের্াচ্চ প্রকাশিত ওজন : 600.0 kg (Ref. 3164); সর্বোচ্চ উলি্ল্লখিত বয়স : 30 বৎসর (Ref. 9859)
পৃষ্ঠীয় কাঁটা (মোট ) : 0; পায়ূ কাঁটা : 0. Diagnosis: A heavily-bodied sawfish with a short but massive saw which is broad-based, strongly tapering and with 14-22 very large teeth on each side; space between last 2 saw-teeth on sides less than 2 times space between first 2 teeth (Ref. 5578). Pectoral fins high and angular, 1st dorsal fin mostly in front of pelvic fins, and caudal fin with pronounced lower lobe (Ref. 5578).
Inhabits sandy or muddy bottoms of shallow coastal waters, estuaries, river mouths, and freshwater rivers and lakes. Usually found in turbid channels of large rivers over soft mud bottoms (Ref. 2847, 44894). Adults usually found in estuaries and young ascend into fresh water. Large adults can also be found in fresh water, but are rarely caught (Ref. 12693). Feeds on benthic animals and small schooling species. Ovoviviparous (Ref. 50449). The saw is used for grubbing and attacking prey as well as for defense. The saws sell as tourist souvenirs (Ref. 7248). Occasionally caught by demersal tangle net and trawl fisheries in the Arafura Sea; possibly extinct in parts of the Indo-Pacific; highly susceptible to gill nets. Utilized for its fins and meat (both of very high value), and skin and cartilage (Ref.58048). Attains 4.6 m total length (Ref. 52193).
Life cycle and mating behavior
পরিপক্কতা | প্রজনন | ডিম ছাড়া | ডিমসমূহ | ডিম্বধারন ক্ষমতা | শুককীট
Ovoviviparous, embryos feed solely on yolk (Ref. 50449). Gestation period about 5 months (Ref. 9859); litter size 1- 13 (Ref. 5578). Probably breeds in freshwater (Ref.58048).
Last, P.R. and J.D. Stevens, 1994. Sharks and rays of Australia. CSIRO, Australia. 513 p. (Ref. 6871)
IUCN Red List Status (Ref. 130435: Version 2024-1)
Threat to humans
Traumatogenic (Ref. 4690)
Human uses
মৎস্য: গৌণ বাণিজ্যিক ; শিকারযোগ্য মাছ: হঁ্যা
হাতিয়ার
Special reports
Download XML
ইন্টারনেট সুত্র
Estimates based on models
Preferred temperature (Ref.
123201): 24.6 - 29.2, mean 28.5 °C (based on 2653 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5234 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00490 (0.00195 - 0.01230), 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): 3.9 ±0.61 se; based on food items.
স্থিতিস্থাপক (Ref.
120179): অত্যন্ত কম , সর্বনিম্ন প্রজন দ্বিগুনের সময় ১৪ বৎসর (tm=10; tmax=30; Fec=1).
Fishing Vulnerability (Ref.
59153): Very high vulnerability (90 of 100).
Nutrients (Ref.
124155): Calcium = 13.9 [3.0, 64.7] mg/100g; Iron = 0.512 [0.120, 1.459] mg/100g; Protein = 19.4 [17.2, 21.6] %; Omega3 = 0.0888 [, ] g/100g; Selenium = 53.2 [15.0, 189.9] μg/100g; VitaminA = 4.43 [1.44, 13.30] μg/100g; Zinc = 0.681 [0.321, 1.284] mg/100g (wet weight);
