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Friday, July 22, 2011

Sand Tiger Shark

Beauty Of Animal | Sand Tiger Shark | The sand tiger shark has a stout body with two large dorsal fins that are almost equal in size and the first dorsal fin placed far back on the trunk of the body. The tail has an elongated upper lobe and no caudal keel. This shark appears bronze from above but is increasingly paler below. Juveniles have reddish or yellow-brown spots on the tail and rear end of the body that fade with age. 
The gill slits are anterior to the origin of the pectoral fins. Large teeth are arranged in three rows on each side of the upper jaw midline. The teeth themselves have long smooth, narrow-edged cusps with one or two small lateral denticles. This shark is able to achieve neutral buoyancy and hover in the water by storing surface air in its stomach. The maximum length attained for the sand tiger shark is 3.2 meters (10.5 feet), although it is generally between 1.2 and 2.7 meters in length. While menacing in appearance, this shark is generally considered to be harmless.
The sand tiger is ovoviviparous, bearing 2 live young after a gestation period of 9 to 12 months; each is approximately 1 meter long. In each of the two separate uterine chambers the first embryo to hatch obtains its food by eating the other developing eggs.    The sand tiger shark is often found in sandy coastal waters, shallow bays, estuaries and rocky or tropical reefs. Although most often found in shallow waters they also swim down to depths of 200 meters.

There have only been three reported sightings of the sand tiger shark in Canadian waters. These sightings were in the Minas Basin of Nova Scotia, near St. Andrews, New Brunswick and off Point Lepreau, New Brunswick. The sand tiger shark also occurs in the eastern and western Atlantic, the Pacific and Indian Oceans and in the Mediterranean and Adriatic Seas.

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