Fish diurnal

Tarakihi

Nemadactylus macropterus

The Tarakihi is a silver icon of the South Pacific, easily recognized by the striking black 'saddle' across its shoulders. A social reef-dweller, it brings a flash of metallic beauty to our coastal waters.

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Quick Identification

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Size

Typically 30–60 cm (12–24 inches) in length and weighing 1–3 kg (2.2–6.6 lbs).

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Colors

Bright shimmering silver body with a distinctive broad black 'saddle' or band across the shoulder area. Fins often have a slight blue or grey tint.

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Key Features

Prominent black saddle-like band behind the head
Single elongated pectoral fin ray
Deeply compressed, silver-blue body
Small mouth with thick, fleshy lips

When You’ll See Them

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Activity pattern diurnal

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Peak hours 8 AM - 11 AM and 3 PM - 5 PM

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Season Year-round, with increased shallow-water sightings during summer and autumn.

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Diet A benthic carnivore that sifts through sand and reef crevices for small crustaceans, polychaete worms, mollusks, and brittle stars.

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Habitat Coastal reefs, sandy bays, and continental shelf waters, typically at depths of 10 to 250 meters.

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Behavior

Tarakihi are highly social, schooling fish that are most commonly found patrolling the edges of rocky reefs and open sandy seafloors. They are known for their inquisitive but cautious nature, often hovering just above the substrate to inspect potential food sources or changes in their environment. In the wild, they form large, shimmering schools that move with a synchronized grace, making them a spectacular sight for underwater observers.

These fish exhibit a predictable daily routine, often moving from deeper waters into shallower reef zones during the day to feed before retreating as light levels change. While they are not aggressive toward humans, they are sensitive to sudden movements and loud vibrations. In coastal communities, they are celebrated not just as a staple seafood but as an indicator species for the health of the local marine ecosystem.

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Camera Tips

Capturing the Tarakihi requires a specialized underwater approach, specifically using a Baited Remote Underwater Video (BRUV) setup. To get the best footage, mount your camera to a weighted frame and position it on a flat sandy patch immediately adjacent to a rocky reef edge. This 'ecotone' is where Tarakihi are most active. Angle the lens slightly upward (about 10–15 degrees) to capture the silver scales catching the sunlight filtering down from the surface, which helps the AI distinguish the fish from the darker seafloor.

To bring Tarakihi into the frame, use a perforated bait canister filled with a 'burley' mix of oily fish (like mackerel or sardines) and crushed shellfish. The scent trail is essential for drawing them out from the reef. For the most natural behavior, ensure the camera is set to record in at least 60 frames per second; Tarakihi have a unique way of 'braking' with their long pectoral fin rays, and high-speed footage allows you to see this fascinating mechanic in detail. Set your AI trigger to look for the high-contrast black saddle marking, as this is their most consistent identifying feature.

Visibility is the biggest challenge for underwater 'backyard' cameras. The best time to deploy your equipment is during a high tide on a day with low swell, which minimizes suspended sediment in the water. If you are filming in deeper or murkier water, a wide-angle lens is preferable to keep the subject close to the sensor. Avoid using harsh artificial lights during the day, as the reflection off their silver scales can cause 'white-out' on the footage; instead, rely on natural light between 10 AM and 2 PM when the sun is directly overhead.

Similar Species

Species that look similar or are commonly confused with Tarakihi.

Porae

Porae lack the distinctive black shoulder saddle and generally have a more greenish-grey hue compared to the bright silver Tarakihi.

Red Moki

Red Moki have thick reddish-brown vertical bands across their entire body, unlike the single shoulder band of the Tarakihi.

Jackass Morwong

While often the same species name is used, some regional variations in Australia have slightly different dorsal fin heights.

Frequently Asked Questions

Tarakihi are primarily diurnal, meaning they are active during daylight hours. They are most frequently seen feeding and moving along reef edges during the mid-morning and late afternoon when light levels are sufficient for them to spot prey on the seafloor.

The most effective way to attract Tarakihi is by using a scent trail. A bait cage filled with crushed shellfish, kina (sea urchin), or oily fish scraps works best. Position your camera near a reef-sand boundary, as they naturally patrol these areas for food.

Tarakihi are benthic feeders. Their diet consists of small invertebrates like crabs, shrimps, marine worms, and small mollusks which they pick out of the sand or reef crevices using their specialized mouths.

While not 'suburban' in the terrestrial sense, Tarakihi are very common in coastal waters near populated areas. If you live near a rocky coastline or a harbor with clean water and reef structures, they are likely nearby.

The easiest way to distinguish them is the black saddle. Tarakihi have a distinct dark band behind the head, whereas Porae are more uniform grey-green or silver without the prominent shoulder band.

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