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Common Remora
Fish diurnal

Common Remora

Remora remora

Meet the ocean's ultimate hitchhiker. The Common Remora uses a specialized suction disc to catch rides on sharks and whales, serving as both a cleaner and a scavenger of the deep.

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Quick Identification

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Size

Typically 30-60 cm (12-24 inches) in length; can reach up to 86 cm (34 inches) and weigh approximately 1.1 kg (2.4 lbs).

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Colors

Uniformly dark gray, brownish-black, or dusky charcoal; ventral (bottom) side is usually the same dark shade as the dorsal side.

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Key Features

  • Modified oval dorsal fin acting as a suction disc with 22-26 lamellae
  • Lower jaw projects significantly forward beyond the upper jaw
  • Streamlined, robust body compared to other remora species

When You’ll See Them

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Activity pattern diurnal
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Peak hours Most active during daylight hours when hosts are moving and feeding.
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Season Year-round in tropical and warm temperate waters.
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Diet A combination of host scraps, small crustaceans, and ectoparasites gleaned from the host's skin.
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Habitat Pelagic and coastal marine environments; generally found wherever large hosts like sharks and rays frequent.

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Behavior

The Common Remora is nature's most famous hitchhiker, known for its commensal relationship with larger marine predators. Using a highly evolved suction disc on the top of its head, it attaches itself to sharks, whales, sea turtles, and even large rays. This attachment isn't just for a free ride; it provides the remora with protection from predators and a constant flow of oxygen-rich water over its gills without the effort of swimming.

While they are often viewed as parasites, they actually provide a cleaning service to their hosts by consuming parasitic copepods and dead skin. They are social in a unique way, often traveling in small groups attached to the same host, and they are occasionally known to detach and follow divers or boats out of curiosity or in search of a new 'ride.'

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Camera Tips

Capturing a Common Remora on camera requires a specialized approach since they are entirely aquatic. For those with waterfront property or access to a pier, an underwater 'drop camera' or a waterproof trail camera mounted to a dock piling is the best method. Position the camera between 3 and 6 feet deep, facing outward toward open water where larger predatory fish are likely to pass by.

To lure these fish into the AI camera's field of view, use a scent-heavy bait like mashed sardines or mackerel inside a mesh chum bag. While the remora itself may not be drawn directly to the bait, the larger predators it attaches to certainly will be. Ensure your camera is set to a high frame rate or 'action' mode, as remoras often move quickly when detaching and reattaching to their hosts.

Lighting is critical for a clear ID. Mid-day (10 AM to 2 PM) offers the best natural light penetration for underwater filming. If your camera setup allows for it, use a wide-angle lens to capture the host and the remora together, which provides great context for AI identification. If you are deploying the camera in a 'backyard' canal or near a reef, check the lens for salt buildup or algae growth weekly to maintain image clarity.

Similar Species

Species that look similar or are commonly confused with Common Remora.

Slender Sharksucker

Much longer and thinner with a distinct dark horizontal stripe running the length of the body.

Whitefin Sharksucker

Smaller in size with noticeably white tips on its dorsal and anal fins.

Frequently Asked Questions

Common Remora are primarily diurnal, meaning they are most active during the day. Their activity levels are closely tied to the movement and feeding patterns of their hosts, such as sharks and sea turtles.
If your 'backyard' is a saltwater dock or pier, you can attract them by using a chum bag filled with oily fish. This attracts the large predatory hosts that Common Remora typically latch onto.
They eat a mix of leftovers from their host's meals, small plankton, and parasitic organisms they pick off the skin of the larger animals they attach to.
They are only found in coastal suburban areas with access to warm marine waters. They are common sights for pier fishers and divers in tropical and subtropical regions.
The Common Remora has a thicker, more robust body and is usually a solid dark color, whereas the Slender Sharksucker is much thinner and features a prominent dark horizontal stripe with white edges.

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