The Blacktip Shark is a species of requiem shark, family Carcharhinidae. Their demeanor has been described as "timid" compared to other large requiem sharks. Both juveniles and adults form groups of varying size. Like other members of its family, the Blacktip Shark is viviparous; females bear 1–10 pups every other year. Young Blacktip Sharks spend the first months of their lives in shallow nurseries, and grown females will return to the nurseries where they were born to give birth themselves. In the absence of males, females are also capable of asexual reproduction. Normally wary of humans, Blacktip Sharks can become aggressive in the presence of food and have been responsible for a number of attacks on people. This species is of importance to both commercial and recreational fisheries across many parts of its range, with its meat, skin, fins, and liver oil used.
The Blacktip Shark has a robust, streamlined body with a long, pointed snout and relatively small eyes. The five pairs of gill slits are longer than those of similar requiem shark species. The jaws contain 15 tooth rows on either side, with 2 symphysial teeth (at the jaw midline) in the upper jaw and 1 symphysial tooth in the lower jaw. The teeth are broad-based with a high, narrow cusp and serrated edges. The first dorsal fin is tall and falcate (sickle-shaped) with a short free rear tip; there is no ridge running between the first and second dorsal fins. The large pectoral fins are falcate and pointed.
The coloration is gray to brown above and white below, with a conspicuous white stripe running along the sides. The pectoral fins, second dorsal fin, and the lower lobe of the caudal fin usually have black tips. The pelvic fins and rarely the anal fin may also be black-tipped. The first dorsal fin and the upper lobe of the caudal fin typically have black edges. Some larger individuals have unmarked or nearly unmarked fins. Blacktip Sharks can temporarily lose almost all their colors during blooms, or "whitings", of coccolithophores. This species attains a maximum known length of 2.8 m (9.0 ft), though 1.5 m (4.9 ft) is more typical, and a maximum known weight of 123 kg (271 lb).
For tackle and bait you can use spinning and baitcasting outfits; also fly outfits. The Blacktip Shark will take shrimp and any sort of fresh cut bait. They have a poor eyesight, and you have to put the lure very close to them so they will also hit a variety of artificial lures, especially topwater plugs and flyrod poppers; large streamer flies; slow-swim- ming jigs and underwater plugs.
The Blacktip Shark has a worldwide distribution in tropical and subtropical waters. In the Atlantic, it is found from Massachusetts to Brazil, including the Gulf of Mexico and the Caribbean Sea, and from the Mediterranean Sea, Madeira, and the Canary Islands to the Democratic Republic of the Congo. It occurs all around the periphery of the Indian Ocean, from South Africa and Madagascar to the Arabian Peninsula and the Indian subcontinent, to Southeast Asia. In the western Pacific, it is found from southern China to northern Australia, including the Philippines and Indonesia. In the eastern Pacific, it occurs from Baja California to Peru. It has also been reported at a number of Pacific islands, including New Caledonia, Tahiti, the Marquesas, Hawaii, Revillagigedo, and the Galápagos.
Inhabiting the continental shelf, the Blacktip Shark is found from Thevenard Island in Western Australia to Sydney in New South Wales.