Fish crepuscular

Grey Reef Shark

Carcharhinus amblyrhynchos

The Grey Reef Shark is the quintessential guardian of the Indo-Pacific coral reefs, known for its sleek profile and striking black-edged tail. A master of the reef drop-off, this social predator offers a thrilling glimpse into the complex world of marine ecosystems.

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Quick Identification

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Size

Typically 1.3 to 1.9 meters (4.3 to 6.2 feet) in length; weighing up to 33.7 kg (74 lbs).

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Colors

Bronze-grey upper body with a contrasting white underbelly. The tail (caudal fin) features a thick, distinct black margin along the trailing edge.

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Key Features

Distinctive thick black margin on the trailing edge of the tail
Broad, rounded snout with large, dark eyes
First dorsal fin is plain grey or subtly tipped with white
No interdorsal ridge between the first and second dorsal fins

When You’ll See Them

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Activity pattern crepuscular

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Peak hours Dawn and dusk for hunting; midday for social grouping.

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Season Year-round

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Diet A generalist predator primarily eating bony fish (like damselfish and surgeonfish), but also opportunistic with squid, octopus, and various crustaceans.

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Habitat Clear, shallow waters near coral reefs, specifically favoring outer reef slopes and drop-offs near deep water.

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Behavior

Grey Reef Sharks are highly social and organized predators, often seen congregating in large groups during the day near reef slopes, passes, or drop-offs. While they appear relatively relaxed during daylight, they are extremely efficient hunters that become more active and solitary as night falls. They are known for their high site fidelity, often remaining within the same small area of a reef for several years.

One of their most famous behaviors is a dramatic 'threat display' used when they feel cornered or threatened. This involves arching the back, lowering the pectoral fins, and swimming with a stiff, exaggerated side-to-side motion. In typical encounters, however, they are naturally curious and will often approach underwater cameras or divers to investigate their surroundings before moving on.

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Camera Tips

Capturing high-quality footage of Grey Reef Sharks requires a different approach than backyard land mammals. Since these are marine animals, you should utilize a Baited Remote Underwater Video (BRUV) setup. This involves securing your camera in a waterproof housing to a weighted frame and extending a 'bait arm' with a perforated container filled with oily fish (like sardines or mackerel). Position the camera on the sandy bottom near the edge of a reef drop-off where currents are present, as the scent trail will draw sharks from down-current directly toward your lens.

Lighting is your biggest challenge underwater. If filming in shallow water (less than 10 meters) during midday, natural light is often sufficient, but you should use a red filter to restore the warm tones lost to water absorption. For deeper shots or early morning activity, external waterproof LED video lights are essential. Set your camera to a high frame rate (60fps or 120fps) because these sharks move with sudden, explosive bursts of speed that look spectacular in slow motion during playback.

Wide-angle lenses are the industry standard for reef sharks. Because they are curious, they will often swim within inches of the camera. A wide-angle lens allows you to capture the entire shark even at close range while maintaining a deep focal plane, ensuring the shark stays in focus as it approaches. Ensure your housing is securely tethered to a reef anchor or a heavy weight, as curious sharks have been known to 'test' equipment with their mouths or accidentally knock cameras over while investigating the bait.

Similar Species

Species that look similar or are commonly confused with Grey Reef Shark.

Blacktip Reef Shark

Easily identified by the prominent black tip on the first dorsal fin and a more timid personality.

Whitetip Reef Shark

Much slenderer with clear white tips on both dorsal fins and the tail; often seen resting on the sandy bottom.

Caribbean Reef Shark

Found in the Atlantic; lacks the distinct black margin on the tail and has a slightly more robust, dusky appearance.

Frequently Asked Questions

Grey Reef Sharks are most active during crepuscular hours (dawn and dusk) when they transition from social grouping to active hunting. However, they are easily spotted patrolling reefs throughout the day.

The most effective method is using a BRUV (Baited Remote Underwater Video) system. Using a scent trail of mashed oily fish will draw them in from a distance to investigate the source of the smell.

Their diet consists mainly of reef-dwelling bony fish, but they also eat cephalopods like squid and octopus, as well as various crustaceans found in the reef nooks.

No, they are strictly marine animals found in tropical coral reef environments, particularly in the Indo-Pacific region, and are not found in freshwater or near-shore suburban coastal zones without coral structures.

Look at the first dorsal fin: the Blacktip Reef Shark has a very prominent, ink-black tip on its dorsal fin, whereas the Grey Reef Shark has a plain or white-edged dorsal fin. Additionally, the Grey Reef Shark has a thick black margin on its tail fin.

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