The blacktip shark (Carcharhinus limbatus) is a species of requiem shark, and part of the family Carcharhinidae. It is common to coastal tropical and subtropical waters around the world, including brackish habitats. 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.