Sharptooth Houndshark

Fascinating facts about the Sharptooth Houndshark

• At a maximum length of 2 m (6.6 ft) and a weight of 40 kg (88 lb), this shark sports pectoral fins so broad and sickle-shaped that they look like tiny wings on a seabird, giving it the name megalopterus – “large wing”. Those oversized fins let it glide just above the bottom while hunting, turning a modest-sized predator into a surprisingly agile bottom-dweller.
• Females give birth to between six and twelve pups every two or three years, after a gestation that stretches roughly 20 months. Newborns emerge at about 30–44 cm long, and siblings in the same litter can differ in size by up to 30 %. This slow, spaced-out reproduction explains why each generation takes years to replace the last.
• Young sharks under 1 m (3.3 ft) live almost entirely on the crab Plagusia chabrus, but as they grow they add bony fish and octopus to the menu, crushing hard shells with molar-like teeth while still snapping slippery prey with sharp cusps. The shift shows how a single species can dominate multiple food niches along the coast.
• A 2006 DNA study found that, despite sharing the genus Triakis, this shark groups genetically with the flapnose houndshark and sits inside the Mustelus lineage, not with the leopard shark as once thought. The result hints that the current genus split may need a rewrite, reminding us that shark family trees are still being redrawn.
• Although the IUCN lists it as least concern, its tiny range from southern Angola to the Eastern Cape, combined with a 25-year lifespan, late sexual maturity at 11–16 years, and litters of only a handful of pups, makes it highly vulnerable to even modest fishing pressure. The paradox shows that a species can appear safe on paper while teetering on the edge of overexploitation.

At a glance

About the Sharptooth Houndshark

The sharptooth houndshark, Triakis megalopterus, is a stout, gray-to-bronze predator that prowls the shallow, sandy bays of southern Africa, from southern Angola to South Africa’s Eastern Cape. Its most striking feature is a set of massive, rounded fins, especially the broad, sickle-shaped pectoral fins of adults, that give it a wing-like silhouette as it glides just above the seabed. A short, blunt snout frames a wide mouth lined with tiny, pavement-like teeth, each crowned by a sharp central cusp capable of both gripping slippery fish and crushing the hard shells of crabs and lobsters. Growing up to 2 m (6.6 ft) and 40 kg (88 lb), females outsize males, and the skin often hangs loosely, revealing a subtle pattern of irregular black spots that can range from sparse to dense in mature individuals. By night, this active swimmer becomes a stealthy hunter, pursuing crustaceans, bony fishes and cephalopods, most notably the crab Plagusia chabrus and Octopus vulgaris, sometimes chasing prey right onto the shore. In summer, groups gather in the shallow waters of False Bay, likely for reproductive purposes, as pregnant females dominate these aggregations. The species is aplacental viviparous; after a 20-month gestation, females birth 6–12 pups between late May and August, then skip another two or three years before reproducing again. A surprising quirk is its occasional daytime foray to feed on mass-spawning chokka squid (Loligo reynaudii), a brief departure from its usual nocturnal routine, hinting at a flexibility that belies its otherwise slow-growing, long-lived nature.

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