Fish nocturnal

Blackchin Guitarfish

Glaucostegus cemiculus

Meet the 'Living Fossil' of the shallows. The Blackchin Guitarfish is a stunning, shark-like ray that haunts sandy coastlines with prehistoric grace and a signature black-tipped snout.

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Quick Identification

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Size

Typically 150-200 cm (4.9-6.6 ft) in length, with maximum sizes reaching 242 cm (7.9 ft). Adults can weigh up to 50 kg (110 lbs).

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Colors

Dorsal side is sandy tan, brownish-grey, or olive with subtle mottling; the underside is creamy white with a distinct blackish-smudge on the snout.

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Key Features

Guitar-shaped body transitioning from a flat head to a shark-like tail
Prominent blackish patch or 'chin' on the underside of the snout
Two large triangular dorsal fins of similar size located far back on the body
Pointed, wedge-shaped snout without a filament at the tip

When You’ll See Them

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Activity pattern nocturnal

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Peak hours 8 PM - 4 AM

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Season May-September (when moving to shallower waters for breeding)

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Diet A carnivorous bottom-feeder that consumes a variety of crustaceans (crabs and shrimp), mollusks, and small bottom-dwelling fish.

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Habitat Coastal marine and brackish waters, specifically sandy or muddy bottoms in bays, estuaries, and the continental shelf.

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Behavior

The Blackchin Guitarfish is a master of camouflage, often spending its daylight hours partially buried in the sandy or muddy seafloor. By vibrating its pectoral fins, it settles into the sediment until only its eyes and spiracles (breathing holes) are visible. This 'lie-and-wait' strategy allows it to remain invisible to predators while keeping a keen eye out for passing prey. Despite their shark-like appearance, they are docile creatures that glide gracefully just above the bottom, using their powerful tails for propulsion rather than flapping their pectoral fins like rays.

Socially, these guitarfish are known to aggregate in shallow coastal waters, especially during the breeding season. While they are generally solitary hunters, they are often found in small groups where food is abundant. For coastal residents, they are elusive neighbors; while they are completely harmless to humans, their populations have been hit hard by overfishing, making a backyard sighting in coastal lagoons or shallows a rare and scientifically significant event.

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Camera Tips

Capturing a Blackchin Guitarfish on camera requires moving your setup from the garden to the water’s edge. If you live on a coastal property with a dock, pier, or a shallow sandy 'backyard' shoreline, your best bet is an underwater trail camera or a high-quality action camera mounted on a weighted 'skid' or tripod. Place the camera at a depth of 3 to 10 feet (1-3 meters) on a flat, sandy patch of seafloor. Use a wide-angle lens setting to capture the full length of the fish as it glides by, and ensure the camera is tilted slightly upward (about 10-15 degrees) to help highlight the silhouette of the snout against the lighter water column.

Since these fish are primarily nocturnal and most active during low-light transitions, your camera’s night vision or low-light performance is critical. To encourage a visit to your 'underwater backyard,' you can use a weighted bait cage filled with oily fish like sardines or crushed crustaceans. Secure the bait about 3 to 5 feet in front of the lens. This won't just attract the guitarfish; it will bring in the small crabs and fish that the guitarfish naturally hunts, creating a hub of activity for your lens to capture.

The best time to record is during the summer months when these fish move into shallower, warmer waters to give birth. Pay close attention to the tides; activity often peaks during the incoming tide when fresh water moves into estuaries. Set your camera to record short video clips (20-30 seconds) rather than still photos, as the unique swimming motion—a blend of a shark's tail power and a ray's flat profile—is their most identifying trait. Because they are critically endangered, always prioritize a 'no-touch' observation policy and ensure your camera gear is secured so it doesn't disturb the sensitive benthic environment.

Similar Species

Species that look similar or are commonly confused with Blackchin Guitarfish.

Common Guitarfish

Smaller in size and lacks the distinct black patch on the underside of the snout.

Halavi Guitarfish

Found in the Red Sea and Indo-Pacific; it has a more rounded snout and different dorsal fin placement.

Frequently Asked Questions

Blackchin Guitarfish are primarily nocturnal, meaning they are most active under the cover of darkness. They spend most of the day buried in the sand to avoid predators and begin hunting for crustaceans and small fish once the sun goes down.

If your 'backyard' includes a coastal dock or sandy shoreline, you can attract them using a weighted bait bag filled with oily fish or crushed shellfish. They are scavengers and hunters that follow their keen sense of smell to find food on the seafloor.

Their diet consists mainly of bottom-dwelling invertebrates. This includes crabs, shrimp, and various mollusks, as well as small fish that live near the sandy bottom.

They are only found in coastal suburban areas along the Mediterranean and Eastern Atlantic. However, they are currently 'Critically Endangered' due to overfishing, making them quite rare to see even in their natural range.

The most reliable way is the 'black chin'—a dark, smudge-like patch on the underside of the snout. They are also generally larger and have a more pointed, wedge-shaped snout compared to the Common Guitarfish.

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