Scientific Name
Tylosurus crocodilus crocodilus  
Tylosurus crocodilus crocodilus鱷形叉尾鶴鱵
by: Lab of Fish Ecol. and Evo., BRCAS
Author (Péron & Lesueur, 1821) Depth 0 - 13M
Chinese 鱷形叉尾鶴鱵 Poisonous Fish No 
Family_Chinese 鶴鱵科 Economic Fish Yes 
Family F255 Belonidae Edible Fish Yes  Chinese In Mainland China 鱷形圓頜針魚 
Max Length 150 cm  Aquarium Fish No  Common Name 青旗、學仔、白天青旗、圓學(澎湖) 
Distribution in World India Ocean to Pacific Ocean   Distribution in Taiwan East、West、South、North、North East、PonFu、ShaoLiuChew、LanI Is.、Greeb IS.、Tung Sa IS. 
Habitats Ocean、Benthos、Coastal、Lagoon、
Holotype Locality Mauritius, Mascarenes, southwestern Indian Ocean 
Reference 臺灣魚類誌(沈等, 1993);The Live Marine Resources of the Western Central Pacific, Vol.4(FAO,1999);Fish of Japan(Nakabo, 2002)  沈世傑 編 Shih-Chieh Shen ed. 1993 Al-Hassan, L.A.J. etc. 1997 Al-Hassan, L.A.J. etc. 1997 Carpenter, K. E. etc. 1999 Nakabo T. 2002 
Specimen List ASIZP0055056. ASIZP0060595. ASIZP0065037. ASIZP0065065. ASIZP0065066. ASIZP0071091. ASIZP0700190. ASIZP0802574. ASIZP0804214. ASIZP0805840. ASIZP0912574. ASIZP0914214. ASIZP0915840. FRIP20539. FRIP21478. NMMSTP00675. NTMP0388. NTUM04869.  
Barcode2015-10-23,Chia-Hao Chang,CO1,%
Common Name Needle fish; Needlefish; Ocean piper; Crocodile needlefish; Crocodile longtom; Houndfish; Hound needlefish; Longjaw; Giant long-tom; Fork tail alligator gar; Gar; Hound; Garfish; Guardfish 
Redlist Status NL Not in IUCN Redlist     
Characteristic Body elongate, rounded in cross-section. Upper and lower jaws greatly elongate and studded with sharp teeth jaw teeth point anteriorly in juveniles; gill rakers absent. Anterior part of dorsal and anal fins with relatively high lobes; dorsal-fin rays 21 to 25; anal-fin rays 19 to 22; pectoral and pelvic fins long; pectoral-fin rays 13 to 15; a distinct black lateral keel on caudal peduncle; caudal fin deeply forked, lower lobe much longer than upper. Predorsal scales numerous and tiny, 271 to 340. Body dark bluish green above, silvery below; a dark blue stripe along sides; juveniles with elevated black lobe in posterior part of dorsal fin which is lost with growth; scales and bones green.
habitats A pelagic species found over lagoon and seaward reefs. Solitary or in small groups. Feeds on fishes. Feared by fishers because they can cause puncture wounds with their sharp snouts when jumping out of the water, e.g. when alarmed or attracted to lights a 
Distribution Widely distributed in the Indo-West Pacific from Red Sea and South Africa to French Polynesia, north to Japan, south to New South Wales, Australia. It is common in waters around Taiwan. 
Utility Although sold fresh and considered a good food fish, its market is limited due to the green-colored flesh.