Thursday, November 22, 2012

Silvertip Sharks

Life of Sea | Silvertip Sharks | Silvertip shark (Carcharhinus albimarginatus) is a large species of requiem shark, family Carcharhinidae, with a fragmented distribution throughout the tropical Indian and Pacific Oceans. This species is often found around offshore islands and coral reefs, and have been known to dive to a depth of 800 m (2,600 ft). Silvertip shark resembles a larger, bulkier gray reef shark (C. amblyrhynchos), and can be easily identified by the prominent white margin on the fins. It reaches a maximum length of 3 m (10 ft).
An aggressive, powerful apex predators, silvertip sharks feed on a variety of bony fishes, as well as eagle rays, small sharks and squid. This species dominates the other requiem shark of equal size when competing for food, and larger individuals often heavily scarred from conflicts with others of its species. Like other members of his family, silvertip shark is viviparous, with females give birth to one to 11 pups in the summer. Silvertip sharks are considered potentially dangerous to humans, as they often approach divers closely enough. This slow-reproducing species taken by commercial fishing for meat, fins, skin, cartilage, and jaws and teeth, which seems to have caused local population declines or extirpations. As a result, the International Union for Conservation of Nature has been assessed as Near threatened.
Silvertip shark species are robust and efficient with the muzzle, rather long, broad and large, round eyes. Five pairs of gill slits short. There are 12-14 tooth rows on each side of both jaws, with one or two small teeth at the symphysis is (the jaw). Spacious top gear with slanted triangle valve and coarse serrations near the base, while the lower teeth have tipped upright with good teeth. The first dorsal fin is large and triangular, originating above or slightly forward from the tip of the pectoral fins free. There is a ridge between the first and second dorsal fins. Pectoral fins are proportionally longer than in the requiem sharks and falcate (sickle-like) in shape, with pointed tips.
Staining blue-gray above with a bronze sheen, and white below. There is a fine white band along the side and peculiar white tips and borders on all fins. Silvertip sharks can grow up to 3 m (9.8 feet) in length, but typically measure 2.0 to 2.5 m (6.6 to 8.2 ft) long. Reported maximum weight is 162.2 kg (358 lbs). Females are larger than males

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