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Commonly Asked Questions

Appears in Georgia Aquarium's:
  • Ocean Voyager
  • Seaside Touch Pool (Aquanaut Adventure: A Discovery Zone)

Range / Habitat

  • Cownose ray occurs in the Eastern Atlantic off the coast of Mauritania, Senegal and Guinea; in the Western Atlantic from southern New England to Florida and throughout the Gulf of Mexico, migrating to Trinidad, Venezuela and Brazil.
  • Found in tropical climates to depths of 72 feet (22 m).

Physical Characteristics

  • Forehead resembles a cow’s nose; an indented groove around the front of its head and distinctly bi-lobed snout. 
  • Coloration is usually brown to olive on the back (dorsal surface), with no spots or marks. The lower body (ventral surface) is a white or yellowish-white.
  • The wings (pectoral fins) are long and pointed. 
  • It has a long whip-like tail with one or two barbs at the base.
  • Common length of 3.8 feet (1.2 m) but rays as large as 7 feet (2.13 m) wide have been recorded.

Diet / Feeding

  • Feeds on crabs, bi-valves, lobsters and bony fish. 
  • The mouth is located on the underside of the body and has strong plate-like teeth for crushing mollusk shells.
  • One way the cownose ray will feed is by using its pectoral fins to stir up the bottom sediments to reveal its prey. It may also use its snout to forage and root on shallow saltwater flats in much the same way in which a wild pig would on land.

Reproduction / Growth

  • Ovoviviparous; young hatch from eggs inside the female and are released from her body alive. Its reproduction period is June through October.
  • Cownose rays typically produce one pup per pregnancy, though there have been reports of six concurrent embryos in a female.
  • Interestingly, gestation for cownose rays is variable. Eleven to twelve months if there is to be one reproductive event per year, five to six months if there are two.
  • This seems to be a geographic variation. Cownose rays found in the Chesapeake Bay tend to have two reproductive events per year while cownose rays in the Gulf of Mexico tend to have one reproductive event per year.

Conservation Status

  • “Near Threatened” on the IUCN Red List.

Additional Information

  • Cownose ray is a pelagic, or open ocean, species also found near the coast.
  • Forms segregated schools and is often seen in aggregations numbering in the thousands.
  • Preyed upon by many sharks, especially hammerheads. Barbs from the species have been found embedded in the heads, jaws and inside the mouths of various shark species.
  • Often mistaken for a shark by swimmers because when it ‘flies’ near the surface its wingtips frequently break the surface and resemble a shark’s dorsal fin.
  • Occasionally seen jumping and landing with a loud smack – probably as a territorial display.
  • The cownose ray is considered to be oceanadromous, meaning that it undertakes long migrations to different parts of the ocean.  It moves in large groups, usually in a seasonal pattern. In the Atlantic, the species moves northward in the late spring and southward in the late fall. In the Gulf of Mexico it migrates in a clockwise manner according to season. 
  • Population believed to be increasing in numbers. Schools of up to 10,000 rays have been observed leaving the west coast of Florida for Yucatan, Mexico in the fall. 
  • High predation of oyster beds could further complicate the problem of declining oyster populations. As a solution they were considered for commercial fisheries but, after cost analysis studies, it was decided not to pursue this option due to the high expense of harvesting the rays.
  • Vision research in rays is ongoing, including investigating their possible ability to see in color. So far, a conclusion has not been reached.

Sources

www.fishbase.org
www.flmnh.ufl.edu/fish/Gallery/Descript/CownoseRay/CownoseRay.html 

The Shark Almanac. Allen, T. B., pg. 144 
Sharks and Rays. Hennemann, R. M., pg. 278