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spottail shark
The spot-tail shark, or sorrah shark (''Carcharhinus sorrah''), is a species of requiem shark, in the family Carcharhinidae, found in the tropical Indo-West Pacific ocean between latitudes 31° N and 31° S, from the surface to a depth of generally about . This shark grows to about . It is fished commercially over much of its range and the IUCN considers it to be "near threatened".
==Description==
The spot-tail shark is a spindle-shaped fish growing to about . It has a fairly long, pointed snout and moderately large eyes. The first dorsal fin is large and curved while the second dorsal fin is small and low. The back and sides are grey and the belly white, and there is a long white streak on the flank. This species can be distinguished from other requiem sharks found in tropical waters by the distinctive black tips to the second dorsal fin, the pectoral fins and the lower lobe of the caudal fin. There is a ridge over the spine extending from the first to the second dorsal fin and a pit just in front of the upper lobe of the caudal fin. The upper teeth are serrated, oblique and triangular. The Australian blacktip shark (''Carcharhinus tilstoni''), which occupies a similar range, has similar black tips to the fins but additionally has a black tip to its first dorsal fin. It lacks the ridge between the two dorsal fins and its upper teeth are also different, being slender, upright and pointed.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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