Fish Active during the day

Scissortail Sergeant

Abudefduf sexfasciatus

iNaturalist Wikipedia

Defined by its striking military stripes and elegant forked tail, the Scissortail Sergeant is a vibrant icon of the Indo-Pacific. These curious and social damselfish turn any shallow reef into a bustling underwater parade.

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Quick Identification

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Size

Grows up to 16 cm (6.3 inches) in length.

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Colors

Silvery-white body with five to six vertical black bars; the deeply forked tail features a distinct black stripe on each lobe.

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Key Features

Deeply forked tail with horizontal black stripes on each lobe
5-6 vertical black 'sergeant' stripes on the body
High-contrast silvery-white and black coloration
Oval-shaped, laterally compressed body

When You’ll See Them

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Activity pattern Active during the day

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Peak hours 9 AM - 4 PM

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Season Year-round

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Diet An opportunistic omnivore that primarily feeds on zooplankton in the mid-water column, but also grazes on filamentous algae and small benthic invertebrates.

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Habitat Shallow tropical coral reefs, reef flats, and protected lagoons, typically at depths between 1 and 15 metres.

public Geographic range

Where Does the Scissortail Sergeant Live?

The Scissortail Sergeant is widely distributed throughout the tropical waters of the Indo-Pacific region. Its native range stretches from the Red Sea and the eastern coast of Africa all the way across the Indian Ocean to the islands of the central Pacific, including French Polynesia. It is commonly sighted as far north as southern Japan and as far south as the northern coasts of Australia and the Great Barrier Reef.

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9 Countries

70M km² Range

Least Concern Conservation

ID Indonesia AU Australia PH Philippines TH Thailand JP Japan Egypt Maldives Fiji Papua New Guinea

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iNaturalist / Verified observation data

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Behavior

The Scissortail Sergeant is a highly social and energetic species, often found in large, mid-water aggregations. They are frequently seen hovering above coral heads, particularly branching corals, which provide a quick refuge from predators. Unlike some of their more aggressive damselfish relatives, Scissortail Sergeants are relatively peaceful, though males become fiercely territorial when guarding egg patches on the rocky substrate.

These fish are diurnal and spend most of their daylight hours foraging in the water column. They are known for their curiosity and are often among the first fish to approach divers or underwater cameras. Their movement is characterized by quick, darting motions, using their 'scissortail' for rapid acceleration to catch drifting plankton or to escape a threat.

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Camera Tips

Capturing the Scissortail Sergeant requires an underwater camera setup, such as a GoPro or a specialized reef-cam housing. Because these fish live in shallow water (often less than 5 metres), natural light is your best friend. Position your camera to face away from the sun to prevent glare and to highlight the silver sheen of their scales. If you are using a stationary 'backyard' pier camera, mounting it to a piling just below the low-tide mark will provide consistent action as these fish love structure.

To attract a school for the perfect shot, look for a 'cleaning station' or a large coral head. These fish are naturally curious about new objects in their environment. Avoid fast movements when placing the camera; once the camera is still, the school will usually return within minutes. Because they are mid-water swimmers, ensure your camera is angled slightly upward toward the surface to capture their silhouettes and the light filtering through the water.

Since Scissortail Sergeants are fast movers, use a high frame rate (at least 60 fps) to avoid motion blur. If your camera allows for it, a red filter can help restore the warm colors lost underwater, though in very shallow water (1-2 metres), the natural sunlight is usually sufficient for their black-and-white patterns. During the nesting season, look for males hovering close to a cleared patch of rock—they will stay in one spot longer, offering a great opportunity for a focused portrait.

Similar Species

Species that look similar or are commonly confused with Scissortail Sergeant.

Bengal Sergeant

Has broader dark bars and a more rounded tail without the distinct 'scissor' stripes.

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Frequently Asked Questions

Scissortail Sergeants are strictly diurnal, meaning they are active during daylight hours. They are most visible from mid-morning to late afternoon when the sun is high, which allows them to easily spot plankton in the water column.

The best way to attract them is to place your camera near a coral head or structural reef feature. They are naturally curious and will often investigate a new stationary object. Avoid feeding them, as this can disrupt their natural behavior and reef health.

They are omnivores with a varied diet. They primarily hunt zooplankton drifting in the current, but they also graze on algae growing on the reef and snack on small crustaceans.

Yes, they are specialized for shallow environments. You can often find them in water as shallow as one metre, making them one of the most common fish seen by snorkelers on reef flats.

While both have vertical black bars, the Scissortail Sergeant is easily identified by its tail. It has two prominent black horizontal stripes—one on the top lobe and one on the bottom lobe of the tail—which the Sergeant Major (Abudefduf saxatilis) lacks.

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