Scientific Name
Gymnosarda unicolor  
Gymnosarda unicolor裸鰆
by: Cheng-Yi Tsai
Author (Rüppell, 1836) Depth 0 - 100M
Chinese 裸鰆 Poisonous Fish No 
Family_Chinese 鯖科 Economic Fish Yes 
Family F475 Scombridae Edible Fish Yes  Chinese In Mainland China 裸狐鰹 
Max Length 248 cm  Aquarium Fish No  Common Name 大梳齒(成功)、長翼、疏齒、大西齒(臺東) 
Distribution in World India Ocean to Pacific Ocean   Distribution in Taiwan East、South、North、North East、Nan Sa IS. 
Habitats Coral、Coastal  Holotype Locality Djedda 
Synonyms Gymnosarda nuda, Pelamys nuda, Scomber vau, Thynnus unicolor   
Reference 臺灣魚類誌(沈等, 1993);The Live Marine Resources of the Western Central Pacific, Vol.6(FAO, 2001)  沈世傑 編 Shih-Chieh Shen ed. 1993 
Specimen List ASIZP0062664. FRIP20260. FRIP21529.  
Common Name Scaleless tuna; Pegtooth tuna; Ruppel's bonito; Whiteflesh tuna; Tunny; Dogtooth tuna; Dogtooth unicolor; Dog teeth; Bonito; Jackass; Greek brown moray 
Redlist Status NL Not in IUCN Redlist     
Characteristic Body elongate and moderately compressed. Mouth fairly large, upper jaw reaching to middle of eye; 14 to 31 large, conical teeth in upper jaw, 10 to 24 in lower jaw; 2 patches of teeth on upper surface of tongue; 11 to 14 gillrakers on first gill arch. Dorsal fins close together, the first with XIII to XV spines, its margin almost straight, the second with 12 to 14 rays followed by 6 or 7 finlets; anal fin with 12 or 13 rays followed by 6 finlets; pectoral fins with 23 to 26 rays; interpelvic process single. Lateral line strongly undulating. Body naked posterior to corselet except for the lateral line, dorsal fin base, and caudal keel; caudal peduncle slender, with a well developed lateral keel between 2 smaller keels on each side. Swimbladder large. Back and upper sides brilliant blue-black, lower sides and belly silvery; no lines, spots or other markings on body; anterior edge of first dorsal fin dark; other fins greyish.
habitats An offshore species found mainly around coral reefs. Generally solitary or occur in small schools of six or less. Preys on small schooling fishes such as Decapterus, Caesio, Nasio, Cirrhilabrus, Pterocaesio and squids. 
Distribution Widespread in the tropical Indo-West Pacific from Red Sea and East Africa to French Polynesia, north to Japan, south to Australia. It is mainly found in eastern Taiwanese waters. 
Utility Marketed canned and frozen.