Fish Active during the day

Blue-spotted Cornetfish

Fistularia commersonii

iNaturalist Wikipedia

A shimmering needle of the sea, the Blue-spotted Cornetfish is a master of camouflage and high-speed suction feeding. Found across the world's tropical oceans, this slender predator is a favorite for reef watchers and underwater photographers alike.

0 Sightings

0 Habitats

Quick Identification

straighten

Size

60–100 cm (24–39 in) average, reaching up to 1.6 m (5.2 ft); weight is negligible due to extremely thin body.

palette

Colors

Silver to greenish-grey with two iridescent blue stripes or rows of blue spots along the back; belly is typically white or pale.

visibility

Key Features

Extremely long, slender, and depressed body
Elongated, tube-like snout with a small terminal mouth
Central tail filament extending from a forked caudal fin
Iridescent blue spots or lines along the dorsal surface

When You’ll See Them

schedule

Activity pattern Active during the day

brightness_5

Peak hours 7 AM - 6 PM

calendar_month

Season Year-round

restaurant

Diet Carnivorous ambush predator; uses its tubular snout like a high-speed vacuum to suck in small fish, crustaceans, and squid.

park

Habitat Coastal reefs, lagoons, and rocky shorelines, typically at depths between 1 and 130 meters.

public Geographic range

Where Does the Blue-spotted Cornetfish Live?

The Blue-spotted Cornetfish is a wide-ranging marine species native to the tropical and subtropical waters of the Indo-Pacific, stretching from the Red Sea and the coast of East Africa to the western shores of the Americas. This adaptable fish has also famously become a Lessepsian migrant, successfully colonizing the Mediterranean Sea after traveling through the Suez Canal. It is now commonly spotted from the warm reefs of Australia and Japan to the Mediterranean coasts of Israel, Turkey, and Italy, as well as the Hawaiian Islands and the Pacific coast of Mexico.

Basemap © OpenStreetMap contributors

10 Countries

160M km² Range

Least Concern Conservation

AU Australia JP Japan MX Mexico Egypt Israel ID Indonesia ZA South Africa US United States PH Philippines TH Thailand

eco

iNaturalist / Verified observation data

View on iNaturalist open_in_new

Explore more Fish arrow_forward

Behavior

The Blue-spotted Cornetfish is a master of stealth, often found drifting motionless in the water column to mimic floating debris or seagrass. They are primarily solitary hunters but are known for a unique 'hitching' behavior where they shadow larger, non-predatory animals like sea turtles or herbivorous fish to camouflage their approach toward prey.

Despite their imposing length, they are remarkably docile and often show curiosity toward divers and underwater camera setups. They move with a subtle undulating motion of their fins, appearing almost weightless as they patrol reef edges and lagoons. When threatened or highly active, they can change their body color intensity to blend into the shadows of the reef or the bright glare of the surface.

photo_camera EverydayEarth exclusive

Camera Tips

To capture the Blue-spotted Cornetfish on an underwater trail camera, placement is the most critical factor. These fish prefer the 'ecotone' or transition zone where the reef meets the sandy floor or seagrass beds. Position your camera on a weighted base or tripod at a depth of 5 to 10 meters near a prominent coral head or reef wall. Because they are elongated, you want to ensure the camera is facing parallel to the reef edge to capture their full profile as they swim past.

Lighting is your best friend when trying to highlight their signature blue spots. In shallow water, natural sunlight between 10 AM and 2 PM provides the best illumination. If your camera is deeper, consider using a diffused external video light; however, be aware that harsh lights may cause silver-bodied fish like the cornetfish to 'blow out' or overexpose in the frame. Using a wide-angle lens is highly recommended because their body length often exceeds the field of view of standard lenses at close range.

While they aren't attracted to traditional 'bait' in the way a shark might be, they are often drawn to areas with high concentrations of glassfish or small damselfish. Setting your camera near a 'cleaning station'—where smaller fish remove parasites from larger ones—is a fantastic strategy. Cornetfish often hover nearby, waiting for an easy meal or waiting their turn for a cleaning. Set your AI camera to trigger on movement, but ensure the sensitivity is high enough to detect their thin, needle-like silhouette, which can sometimes be missed by basic motion sensors.

Similar Species

Species that look similar or are commonly confused with Blue-spotted Cornetfish.

Reef Needlefish

Lacks the tubular snout and tail filament; possesses long jaws filled with visible sharp teeth.

Browse all Fish arrow_forward

Frequently Asked Questions

Blue-spotted Cornetfish are diurnal, meaning they are most active during the daylight hours when they can use their keen eyesight to hunt small fish and crustaceans among the coral.

They are best attracted by placing cameras near healthy coral reef edges or seagrass beds where their natural prey, like small reef fish and shrimp, congregate. They are also curious and may investigate stationary objects.

They are carnivores that use their long, tubular snouts to create a powerful vacuum, sucking up small fish, larval fish, and various small crustaceans.

Yes, they are very common in shallow lagoons and reef flats, often found in water as shallow as 1 to 3 meters, though they can live much deeper.

While both are long and slender, the Cornetfish is much thinner, usually silver or green rather than yellow or brown, and has a distinct whip-like filament extending from the center of its tail which the Trumpetfish lacks.

Record Blue-spotted Cornetfish at your habitat

Connect a camera to start building your own species record — AI identifies every visitor automatically.

Join free Identify a photo