Silky Shark

Fascinating facts about the Silky Shark

• The silky shark is a large, streamlined requiem shark whose smooth, densely denticulated skin gives it a silk-like feel. Adults commonly reach 2.5 m (8 ft 2 in) in length, with the biggest recorded at 3.5 m (11 ft) and weighing 346 kg (763 lb). Its first dorsal fin is unusually small, less than one-tenth the body length, and sits behind the long, sickle-shaped pectoral fins. The back displays a metallic bronze-gray hue that fades to a snowy white belly, while the fin tips darken with age. These morphological traits, especially the tiny first dorsal fin and the fine dermal denticles, distinguish it from other large requiem sharks.
• Silky sharks inhabit warm tropical seas worldwide, preferring waters warmer than 23 °C (73 °F). They are primarily open-ocean dwellers but are most abundant from the surface down to 200 m (660 ft), occasionally diving beyond 500 m (1,600 ft). Their movements concentrate along the edges of continental and insular shelves, especially over deep-water reefs and around islands, where they can be found as shallow as 18 m (59 ft). Tagging studies show they spend 99 % of their time within 50 m (160 ft) of the surface and favor temperatures of 26-30 °C (79-86 °F), a pattern that holds day and night.
• Silky sharks are viviparous; after the yolk sac is exhausted, a placental connection supplies the developing embryos with nutrients. Females can produce litters of up to 16 pups, either annually or biennially, and give birth in sheltered reef nursery areas on the outer continental shelf. These nurseries provide abundant food and protection from larger pelagic predators, allowing the newborns to add 25-30 cm (9.8-11.8 in) in length during their first year. After several months, the juveniles leave the nursery and migrate into the open ocean, where they continue to grow and eventually join the adult population.
• Although once thought immune to over-exploitation because of its abundance, the silky shark has suffered substantial worldwide declines. Global catches dropped from 11,680 tons in 2000 to 4,358 tons in 2004, and regional assessments report reductions of 60 % to over 90 % in several fisheries. The IUCN reassessed the species as Vulnerable in 2017, citing its modest reproductive rate, litter sizes of up to 16 pups and a 12-month gestation, as insufficient to offset intense commercial and by-catch pressure from tuna longlines and shark fisheries. Conservation measures such as fin-ning bans and improved by-catch monitoring are now being implemented, but the shark's highly migratory nature makes management challenging.

Sources

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• Wikipedia

At a glance

About the Silky Shark

The silky shark (Carcharhinus falciformis) is a large, fast-moving requiem shark found in tropical oceans worldwide. It prefers the warm surface layers of the open ocean, especially along the edges of continental and island shelves where deep-water reefs provide abundant prey. Adults typically measure 2.5 m, with a sleek, metallic gray back and a white belly, and are distinguished by a small first dorsal fin and long, sickle-shaped pectoral fins. Its diet is diverse, ranging from tuna and other bony fishes to squid and crustaceans, and it often herds schools into dense bait balls before striking. Reproduction is viviparous, with females bearing up to 16 pups in reef nurseries before the young migrate to the open sea. This combination of wide distribution, high mobility, and aggressive hunting makes the silky shark a prominent predator in pelagic ecosystems.

Silky Shark photographed on Feravox

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