Elasmobranchii
板鳃亚纲 (鲨鱼与 鱼) (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
生态学
海洋; 淡水; 半咸淡水 底中水层性; 非产卵性溯降河的 (Ref. 51243); 深度上下限 0 - 40 m (Ref. 9859), usually ? - 40 m (Ref. 55270). 熱帶; 43°N - 20°S, 30°E - 160°E (Ref. 114953)
Indo-West Pacific: widespread, Red Sea to eastern Australia, north to Japan.
印度-西太平洋: 紅海與波斯灣到新幾內亞, 北至日本南部, 南至澳洲北部。
Length at first maturity / 大小 / 重量 / 年龄
Maturity: Lm 264.0, range 246 - 282 cm
Max length : 470 cm TL 雄鱼/尚未辨别雌雄; (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.
背面略灰色的, 腹面灰白的; 鳍通常灰白的。 身体像鲨鱼一样的, 胸鳍明显的; 平的头部, 具有一个生长着 18-22个对侧齿的刀剑状的吻; 叶片细长的, 末梢不尖的。 鼻孔非常狭窄的有小鼻盖。 嘴的齿短,平的, 宽广三角形, 没有凹槽沿着后缘; 没有牙齿在叶片的基部。 成鱼有空隙大的细齿, 幼鱼有裸露的皮肤。
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).
发现于岸边了, 常见于河三角州与河口中; 向上侵入到河需要证实。 (参考文献 9859) 常见于掩蔽的海湾且底部为沙地的地方。 吃小鱼与墨鱼。 (参考文献 9859) 卵胎生的.(参考文献 50449) 通常无害处的但是它的像锯子一样吻可能引起，严重的伤害当被捕捉时: 它是已知的打击猛烈的与强有力地.(参考文献 9859) 在亚洲的一些部份中因为它的肉与肝脏 (是丰富的在油) 而捕捉了。 (参考文献 6871) 达到 610 公分TL 的最大长度是以未被证实的报告为依据.(参考文献 9859)
Life cycle and mating behavior
成熟度 | 繁殖 | 产卵场 | 卵 | 孕卵数 | 仔鱼
Ovoviviparous. Litter size from 6 to 23, young born in the spring (Ref. 9859).印度-西太平洋: 紅海與波斯灣到新幾內亞, 北至日本南部, 南至澳洲北部。
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)
人类利用
渔业: 商业性; 游钓鱼种: 是的
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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).
营养阶层 (Ref.
69278): 4.5 ±0.62 se; based on food items.
回复力 (Ref.
120179): 低的, 最小族群倍增时间4.5 - 14 年 (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153): Very high vulnerability (90 of 100).
