Scientific Name	Carcharhinus obscurus   Pronounce			by: Lab of Fish Ecol. and Evo., BRCAS
Author	(Lesueur, 1818)	Depth	0 - 400M
Chinese	灰色真鯊	Poisonous Fish	No
Family_Chinese	真鯊科	Economic Fish	Yes
Family	F029　Carcharhinidae	Edible Fish	Yes	Chinese In Mainland China	灰真鯊(暗體真鯊)
Max Length	420 cm	Aquarium Fish	No	Common Name	大沙、灰色白眼鮫
Distribution in World	global	Distribution in Taiwan	East
Habitats	Coral、Benthos、Coastal	Holotype Locality	No locality (= East coast of U.S.A.)
Synonyms	Carcharhinus iranzae, Carcharhinus lamiella, Carcharhinus obscurella, Carcharias macrurus, Carcharinus iranzae, Carcharinus obscurus, Eulamia obscura, Galeolamna eblis, Galeolamna greyi, Galeolamna macrurus, Prionodon obvelatus, Squalus obscurus
Reference	臺灣魚類誌(沈等, 1993)；中國動物誌-圓口綱及軟骨魚綱(朱等, 2001)；FAO Species Catalogue, Vol.4 Sharks of the world  Schwartz, F.J. 1983 Compagno, L.J.V. 1984 Compagno, L.J.V. 1984 沈世傑 編 Shih-Chieh Shen ed. 1993 朱元鼎, 孟慶聞 等編 2001
Specimen List
Common Name	Shark; Shovelnose; Requin obscur; Dusky ground shark; Bronze shark whaler; Black whaler; Bay-shark; Dusky shark; Bronze whaler; Common whaler; Brown dusky shark; Brown common gray shark; Brown shark; Dusky whaler; Dusky shark
Redlist Status	IUCN Redlist: Lower Risk/near threatened(LR/nt)  2000-06-30
Characteristic	A large, fairly slender species. Snout short to moderately long and broadly rounded. Eyes moderately large, its length 1-2.1% of total length. Gill slits moderately long, length of the 3rd 2.7-4% of total length and less than a third of 1st dorsal fin base. Rows of anteroposterior teeth in each jaw half 14-15/13-15. Upper teeth with broad, triangular, strong serrated, rather low erect to slightly oblique cusps, that smoothly merge into crown feet which have slightly coarser serrations but no cusplets. Lower teeth with erect, moderately broad, serrated cusps and tranverse or sometimes arched roots. Interdorsal ridge present. First dorsal fin moderated-sized, with a pointed or narrowly rounded apex. Origin of 1st dorsal fin usually over or slightly anterior to the pectoral free rear tips. Inner margin of 1st dorsal moderately short, a third of dorsal fin base or less. Second dorsal fin small and low, its height 1.5-2.3% of total length. Origin of 2nd dorsal fin about over anal origin. Pectoral fin large, with a narrow rounded or pointed apices. Number of total vertebral centra 173-194, precaudal centra 86-97. Tips of most fins dusky but not black or white. An inconspicuous white band on flank.
habitats	A common, coastal-pelagic, inshore and offshore warm-temperate and tropical shark. This species is strongly migratory in temperate and subtropical area in eastern North Pacific and western North Atlantic. Viviparous, with a yolk-sac placenta. Litter size
Distribution	Western Atlantic including southern Massachusetts and George Bank to Florida, Bahamas, Cuba, north Gulf of Mexico, and Nicaragua. Eastern north Atlantic including Canary and Cape Verde Islands, Senegal, Sierra Leone. Western Indian Ocean including South A
Utility	A very common offshore shark regularly caught with longline, hook-and-line and set bottom nets. It is utilized fresh, dried salted, frozen and smoked for human consumption, hides for leather, fins for shark-fin soup base, and liver oil extracted for vitam