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Kingdom Animalia  
 Phylum Chordata  
 Class Actinopterygii  
 Order Perciformes  
 Family Scombridae  
 Genus Thunnus  
  Thunnus obesus  (Lowe, 1839) 
Provider: Kwang-Tsao Shao 
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Synonyms:Germo obesusGermo sibiNeothunnus obesusOrcynus sibiParathunnus mebachiParathunnus obesusParathunnus obesus mebachiParathunnus sibiThunnus abesusThunnus atlanticusThunnus mebachi details
Citation: 臺灣魚類誌(沈等, 1993);The Live Marine Resources of the Western Central Pacific, Vol.6(FAO, 2001)
Character: Body fusiform, elongate, and slightly compressed. Teeth small and conical, in a single series. Gill rakers 27 to 34 on first arch. Two dorsal fins, separated only by a narrow interspace, some large specimens with very long second dorsal and anal fins, the first with XIV to XV spines; second dorsal fin with 13 to 15 rays followed by 8 to 9 finlets; anal fin with 13 to 15 rays followed by 8 to 9 finlets; pectoral fins moderately long in large individuals, but very long in smaller individuals; interpelvic process small and bifid. Body with very small scales; corselet of larger scales developed but not very distinct. Caudal peduncle very slender, bearing on each side a strong lateral keel between 2 smaller keels. Swimbladder present. Lower sides and belly whitish; a lateral iridescent blue band runs along the sides in live specimens. The first dorsal fin is deep yellow, the second dorsal and anal fins are light yellow, the finlets bright yellow edged with black. 
Habitat: Occur in areas where water temperatures range from 13°-29°C, but the optimum between 17° and 22°C. Variation in occurrence closely related to seasonal and climatic changes in surface temperature and thermocline. Juveniles and small adults school at the su 
Distribution: Cosmopolitan in tropical and temperate waters of all oceans, but absent in the Mediterranean; a common species in Taiwan, especially in eastern and southern part. 
Utility: Meat highly prized and processed into sashimi in Japan. Marketed mainly canned or frozen, but also sold fresh. 
Name Code: 382502
  IUCN Red List:VU A2bd     Marine     
Suggested Link    The Fish Database of Taiwan  FishBase  Discover Life  World Register of Marine Species (WoRMS) 
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