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Elasmobranchii 板鰓亞綱 (鯊魚與魟魚) (sharks and rays) > Carcharhiniformes (Ground sharks) 真鯊目 (Ground sharks) > Carcharhinidae (Requiem sharks) 白眼鮫科 (Requiem sharks)
Etymology: Triaenodon:triaeno, from triaina (Gr.), trident (having three points); odon (Gr.), tooth, referring to each having a cusp and two cusplets (See ETYFish); obesus:Latin for fat or stout, referring to its blunt head, said to give the shark a plump appearance (See ETYFish). More on author: Rüppell.
Indo-Pacific: Red Sea and East Africa to Indonesia and the Arafura Sea (Ref. 9819), north to Ryukyu and Ogasawara islands, south to New South Wales (Australia), New Caledonia, and the Austral and Pitcairn islands; throughout Micronesia. Eastern Pacific: Cocos and Galapagos islands, Panama to Costa Rica. 印度-太平洋: 紅海而且東非到印尼與阿拉弗拉海 (參考文獻 9819), 北至琉球與小笠原群島, 南至新南威爾斯 (澳洲) ，新加勒多尼亞與澳洲與皮特凱恩群島; 在密克羅尼西亞各處。 東太平洋: 可可島與加拉巴哥群島，巴拿馬到哥斯大黎加。
初熟時的長度 / 大小 / 重量 / 年齡
成熟度: Lm107.0, range 105 - 109 cm Max length : 213 cm TL 雄魚/尚未辨別雌雄; (Ref. 244); common length : 160 cm TL 雄魚/尚未辨別雌雄; (Ref. 244); 最大體重: 18.3 kg (Ref. 4699); 最大年齡: 25 年 (Ref. 6807)
背棘 (總數) : 0; 臀棘: 0. A small, slender shark with an extremely short, broad snout, oval eyes, and conspicuous white tips on the 1st dorsal (sometimes 2nd) and upper caudal fins; 2nd dorsal almost as large as 1st; no interdorsal ridge (Ref. 5578). Spiracles usually present, teeth 47-50/ 44-46, in at least 2 functional rows. Grey above, lighter below and sometimes with dark spots on sides (Ref. 5578). First dorsal-fin lobe and dorsal caudal-fin lobe with conspicuous white tips, second dorsal-fin lobe and ventral caudal-fin lobe often white-tipped (Ref. 9997). Body shape (shape guide): fusiform / normal. 一種小的, 細長的在第一背鰭 (有時第二) 與上尾部的鰭上鯊魚有一個非常短又寬的吻，橢圓形的眼與顯著的白色頂端; 第二背鰭幾乎與第一一樣大; 沒有間背脊.(參考文獻 5578) 呼吸孔通常呈現,齒 47-50/44-46,至少形成 2 功能的列。 背面灰色的, 腹面顏色較淡而且在側邊上有時具有深色的斑點.(參考文獻 5578) 第一背鰭葉與背部尾鰭葉時常有明顯的白色頂端，第二背鰭-鰭的葉與腹的尾鰭葉尖端白色的.(參考文獻 9997)
Sluggish inhabitant of lagoons and seaward reefs where it is often found resting in caves or under coral ledges during the day (Ref. 6871, 58302), or usually on a sand patch, or in a channel (Ref. 37816). More active at night or during slack tide in areas of strong currents (Ref. 37816). Feeds on benthic animals such as fishes, octopi, spiny lobsters and crabs (Ref. 244). Viviparous (Ref. 50449). Travels distances from about 0.3 to 3 km in periods up to about 1 year (Ref. 244). Rarely reported to attack humans, but is potentially dangerous especially when fish had been speared (Ref. 244). Probably fished wherever it occurs (Ref. 244). Caught by inshore longline and gillnet fisheries, and probably adversely affected by dynamite fishing (Ref.58048). Meat and liver utilized fresh for human consumption (Ref. 244). The liver of this shark has been reported as toxic (Ref. 583). One to five 60 cm young per litter (Ref. 1602). Minimum depth reported taken from Ref. 128797.
Viviparous, placental (Ref. 50449), with 1 to 5 young per litter (Ref. 244); usually 2 or 3 pups after a gestation period of > 5 months (Ref.58048). Size at birth 52-60 cm TL (Ref. 9997). Distinct pairing with embrace (Ref. 205).
During courtship and prior to copulation, the male bites the female on her right pectoral fin and uses his medially flexed right clasper in copulation (Ref. 49562, 51119). During copulation which lasts from 15 seconds to 4 minutes (Ref. 49562, 51119), both heads of the male and female are slammed in the substrate and their bodies undulate to keep their tails elevated (Ref. 51155). This mating behavior was observed in individuals bred in captivity.印度-太平洋: 紅海而且東非到印尼與阿拉弗拉海 (參考文獻 9819), 北至琉球與小笠原群島, 南至新南威爾斯 (澳洲) ，新加勒多尼亞與澳洲與皮特凱恩群島; 在密克羅尼西亞各處。 東太平洋: 可可島與加拉巴哥群島，巴拿馬到哥斯大黎加。
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)
