Prionodon curcuri Castelnau, 1855 Squalus acronotus Poey, 1860 * ambiguous synonym The blacknose shark (Carcharhinus acronotus) is a species of requiem shark, belonging to the family Carcharhinidae, common in the tropical and subtropical waters of the western Atlantic Ocean.

[2] This species generally inhabits coastal seagrass, sand, or rubble habitats, with adults preferring deeper water than juveniles.

Like other members of their family, they exhibit a viviparous mode of reproduction in which the developing embryos are sustained by a placental connection.

The females give birth to three to six young in late spring or early summer, either annually or biennially, after a gestation period of eight to 11 months.

In 2009, the U.S. National Oceanic and Atmospheric Administration announced the populations of the blacknose shark off the United States are being overfished, and proposed new conservation measures.

[8] The blacknose shark has a slender, streamlined body with a long, rounded snout and large eyes.

Twelve to 13 and 11 to 12 tooth rows occur on either side of the upper and lower jaws, respectively, with one or two teeth at the symphysis (middle).

[9] The body is covered with overlapping dermal denticles that bear five to seven longitudinal ridges (three in very young individuals) leading to three to five marginal teeth.

The display consists of the shark hunching its back, lowering its pectoral fins, gaping its jaws, and swimming with an exaggerated side-to-side motion.

[3][14] Known parasites of this species include the copepods Nesippus orientalis, Perissopus dentatus, Pandarus sinuatus, Kroyeria sphyrnae, Nemesis atlantica, and Eudactylina spinifera,[15] as well as tapeworms in the genera Paraorygmatobothrium and Platybothrium.

[7] The seasonality of these events means the reproductive cycle is offset by six months between populations in the Northern and Southern Hemispheres.

[3] Female blacknose sharks grow more slowly, attain a larger ultimate size, and have a longer lifespan than males.

[7] It is also of regional commercial importance, being taken intentionally and as bycatch via gillnets and surface longlines across its range, most significantly off southwestern Florida, Venezuela, and Brazil; the meat is sold dried and salted.

Recent stock assessments conducted by the U.S. National Oceanic and Atmospheric Administration (NOAA) have determined the populations of this species have become overfished in both the Atlantic and the Gulf of Mexico.