Fish crepuscular

Dusky Smooth-hound

Mustelus canis

Meet the 'Dogfish' of the coastal shallows—a sleek, social shark that cruises the seafloor with grace. Harmless to humans and fascinating to watch, the Dusky Smooth-hound is a master of the underwater hunt.

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Quick Identification

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Size

Up to 1.5 meters (5 feet) in length; typically weighs between 3.2 and 12.2 kg (7–27 lbs)

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Colors

Olive-gray, bronze, or brownish-grey upper body with a pale yellowish or white underside; no distinct spots on the fins or body

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Key Features

Slender, streamlined body with two large dorsal fins of nearly equal size
Blunt, dog-like snout with large, oval eyes
Lacks the sharp, pointed teeth of other sharks, possessing flat grinding plates instead
Smooth skin compared to other sharks due to very fine dermal denticles

When You’ll See Them

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Activity pattern crepuscular

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Peak hours 6-9 PM, 4-7 AM

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Season May-October

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Diet A specialized predator of crustaceans, primarily eating crabs, lobsters, and shrimp, as well as small fish and mollusks.

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Habitat Coastal waters, bays, and estuaries with sandy, muddy, or gravelly bottoms, ranging from the surf zone to depths of 200 meters.

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Behavior

The Dusky Smooth-hound, often called the Smooth Dogfish, is a highly active and migratory species of houndshark. Unlike the solitary nature of many larger shark species, these sharks are quite social and are frequently observed traveling in large, gender-segregated schools. They are primarily bottom-dwellers, spending their time cruising just inches above the seafloor in search of prey. Because they lack the sharp teeth of many other sharks, they are completely harmless to humans and are often described as the 'dogs of the sea' due to their inquisitive but non-threatening nature.

These sharks exhibit impressive seasonal migrations, moving north toward cooler waters in the spring and returning south as temperatures drop in the autumn. They are remarkably resilient and were notably the first shark species discovered to be susceptible to viral infections, providing valuable insights into marine biology. Their life cycle is relatively long, with females living up to 16 years, and they are known for their high metabolism, requiring them to forage almost constantly to maintain their energy levels.

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Camera Tips

To capture the Dusky Smooth-hound on camera, you will need a specialized underwater setup. If you have a backyard dock or live near a coastal estuary, a 'dock cam' or a Baited Remote Underwater Video (BRUV) system is the most effective tool. Position your camera within 1 to 3 feet of a sandy or muddy seafloor, as this shark spends the majority of its time patrolling the bottom for buried crustaceans. Mounting the camera to a weighted tripod or a pier piling during the incoming tide will yield the best results, as the rising water often brings these sharks into shallower bays to feed.

Because the Dusky Smooth-hound relies heavily on its sense of smell (olfaction) to find food, using a scent-based attractant is crucial. A perforated PVC tube filled with crushed oily fish, like mackerel or menhaden, creates a 'chum slick' that will draw sharks from a significant distance directly into your camera's field of view. Ensure the bait is secured so that the shark remains in front of the lens while trying to investigate the source of the scent. Since they are most active during the low-light hours of dusk and dawn, use a camera with high light sensitivity or an infrared (IR) illuminator to avoid spooking the animals with bright white lights.

For the best clarity, aim to record during 'slack tide' when the water is least turbulent and the sediment has settled. If your camera settings allow, choose a high frame rate (60fps or higher) to capture their smooth, rhythmic swimming motion without motion blur. During the peak summer months, look for areas with submerged vegetation or oyster beds nearby, as these are high-traffic corridors for the crabs the sharks are hunting. Seasonal placement is key; in many regions, you will only see results between late spring and early autumn when the sharks migrate into shallower coastal zones.

Similar Species

Species that look similar or are commonly confused with Dusky Smooth-hound.

Spiny Dogfish

Possesses sharp, mildly venomous spines in front of each dorsal fin and often has white spots along its sides.

Common Smooth-hound

Extremely similar but found primarily in the eastern Atlantic (Europe/Africa) and often features small white spots on its back.

Sandbar Shark

Has much taller, more triangular dorsal fins and sharp, serrated teeth rather than flat grinding plates.

Frequently Asked Questions

Dusky Smooth-hounds are primarily crepuscular, meaning they are most active during the twilight hours of dusk and dawn. However, they are also known to forage throughout the night, using their keen sense of smell to hunt in total darkness.

The best way to attract these sharks is by using a scent-based lure, such as a mesh bag or perforated tube filled with oily baitfish like menhaden or mackerel. They follow scent trails in the current, which will lead them directly to your lens.

Their diet consists almost entirely of crustaceans. They use their flat, pavement-like teeth to crush the hard shells of crabs, lobsters, and shrimp. Occasionally, they will also eat small fish, squid, and marine worms.

Yes, they are very common in coastal bays, estuaries, and even near suburban docks and piers along the Atlantic coast, especially during the warmer months when they migrate into shallower waters to feed and pup.

The easiest way to distinguish them is by looking at the dorsal fins. The Dusky Smooth-hound lacks the sharp spines found in front of the dorsal fins of a Spiny Dogfish. Additionally, the Dusky Smooth-hound has a much larger second dorsal fin relative to the first.

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