Common Smooth-hound

Fascinating facts about the Common Smooth-hound

• From the British Isles down to South Africa, the common smooth-hound patrols a swath of the eastern Atlantic and the Mediterranean, diving as deep as 625 m (2,050 ft) but most often hanging out in the shallow 5–50 m (20–160 ft) zone where its prey congregates.
• Although it can reach a length of 2 m (80 in), most individuals top out around 1.5 m (60 in) and the bulk of the population stays between 1.0 m and 1.2 m (40–50 in), making it a medium-sized shark that fits comfortably in a large kayak.
• Newborn pups are about 35 cm (10 in) long and grow to the typical adult size of 100–120 cm (40–50 in).
• Its grey-brown back and white belly give it a muted two-tone look, but you can tell it apart from the similarly spotted starry smooth-hound by the lack of white spots and from the tope shark by its noticeably larger second dorsal fin.
• All five fins – two dorsal, one anal, a pair of pectoral and pelvic fins, plus a heterocercal tail – act like a built-in stabiliser, and in males the pelvic fins transform into claspers for internal fertilisation, a neat example of shark anatomy adapting to live birth.

At a glance

About the Common Smooth-hound

Gliding through the temperate waters of the eastern Atlantic, from the British Isles down to South Africa, the common smooth-hound (Mustelus mustelus) presents a sleek, grey-brown silhouette that fades to a crisp white beneath. Its two dorsal fins and heterocercal tail give it a balanced motion as it patrols depths typically between 5 and 50 m, though it can be found as deep as 625 m. Growing most often to 100–120 cm, with occasional individuals reaching 150 cm and a maximum of 200 cm, this shark’s modest size belies a viviparous reproductive strategy that delivers pups about 35 cm long. Males sport modified pelvic fins that become claspers, a distinctive feature for internal fertilisation, while the fin arrangement – two dorsal, an anal, paired pectoral and pelvic fins – stabilises its sleek body. A subtle yet surprising trait of the common smooth-hound is its propensity for misidentification; its plain back often leads observers to mistake it for the starry smooth-hound, which bears faint white spots, or the tope shark, which lacks the smooth-hound’s larger second dorsal fin. This camouflage of similarity, combined with its habit of lingering near the seabed, makes it a quiet, elusive presence in the Mediterranean, Madeira, and the Canary Islands.

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