Alopias pelagicus

Scientific Name:-
Alopias pelagicus

Common Name:-
Pelagic Thresher / Whiptail Shark

Malayalam Name:-
Puramkadal Nilamthalli Sravu


Vulnerable in IUCN Redlist of species.


Thresher sharks are characterised by the extremely long upper caudal fin lobes. The pelagic thresher closely resembles, and is often confused with, the common thresher but can be distinguished from this species by the presence of dark patches of skin above the pectoral fin bases and by the absence of labial furrows.Dorsal profile of head convex and forehead moderately convex in lateral view; space between dorsal edges of eyes broadly convex; snout moderately long, conical; an inconspicuous horizontal groove on each side of head above gills; labial furrows absent; teeth small, over 29 rows in either jaw. Pectoral fins not falcate, straight and broad-tipped; terminal lobe of caudal fin very small. Dorsal surface coloration is blue-gray when alive or very fresh, fading to a pale gray shortly after death. The sides of the body are a light blue-gray (light gray shortly after death), with a white ventral surface. The gill and flank region may have a metallic silvery hue.


Not recorded, though common catch in the tuna and shark longline, and tuna drift net fisheries.


Utilized for human consumption, liver oil for vitamin extraction, hides for leather, and fins for shark-fin soup, this species is frequent in the chondrichthyan landings of India.


Marine; oceanic and epipelagic species; usually mesopelagic in the tropics



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