+66 (0)89 050 3009



Boxfishes Pufferfishes

Filefish are rhomboid-shaped fish with with deep keeled bodies and can appear very similar to triggerfish, their close relatives. Filefish have very thin (laterally compressed) bodies, small snouts and mouths with projecting incisor teeth. The eyes are located high on the head. Filefish vary in size from around 20 cm up to about 60 cm for the largest species, the scribbled filefish, which is often found at the dive sites around Koh Lanta.

This family of fish have a slender, retractable dorsal fin spine on the top of the head, and in most species, there is a second, smaller dorsal fin spine, which is used to lock the first spine into an erect position. The remaining fins are simple, soft fins, with small pectoral fins and a short, fan-shaped tail fin. Scales are very small, giving the skin a rough leathery feel, hence the other common name 'leatherbacks'.

Filefish are bottom-dwelling and can be found solitary, in pairs, or small groups. Filefish are slow swimmers, in part due to their small, soft fins. Some species feed on algae, others on small invertebrates, including sponges, plants, gorgonians and hydrozoans. Some species eat corals and zooplankton.

3 species found on this page.

Scribbled Filefish

Aluterus scriptus

Scribbled Filefish (Aluterus scriptus) @ Koh Bida

Aluterus scriptus @ Koh Bida

The Scribbled Filefish has a pale grey body colour, with many small greyish-brownish spots, darker on the upper body and head, lighter on the lower body. There are larger, darker spots to the rear of the body, and on the tail fin base. There are irregular bright blue lines and spots on the body.

The unusually long rounded tail fin is pale with fine black streaks.

The Scribbled Filefish grows to 110 cm and is one of the larger species seen around the southern Andaman coral reefs.

The diet includes algae, seagrass, hydrozoans, gorgonians and anemones.

Barred Filefish

Cantherhines dumerilii

Barred Filefish (Cantherhines dumerilii) @ Koh Haa

Cantherhines dumerilii @ Koh Haa

The Barred Filefish has a yellowish-brown to greyish-brown body with around 12 faint dark vertical bars along the side of the body. The eyes are yellow and the lips are white. The dorsal, anal and pectoral fins are yellowish. The tail fin is a dusky orange colour.

The Barred Filefish grows to 38 cm, though more usually observed around 20 cm - 25 cm. The diet includes acropora branching coral polyps, algae, sponges, sea urchins and mollusks.

Wirenet Filefish

Cantherhines pardalis

Wirenet Filefish (Cantherhines pardalis) @ Koh Haa

Cantherhines pardalis @ Koh Haa

The Wirenet Filefish has a bluish-grey to bluish-brown body. The head has numerous wavy diagonal bluish or purplish stripes and the body has a bluish honeycomb, or wire-net like pattern.

The top of the tail base usually has a white spot. The fins are yellowish.

The Wirenet Filefish grows to 25 cm and is usually seen around the outer reef areas. This is a less commonly seen species, feeding on bottom-dwelling invertebrates.

Diving with Filefishes

Spot Filefishes on one of our daily Koh Lanta diving trips. Or if you prefer to keep your adventure on the surface, you can also book one of our Koh Lanta snorkeling trips.

Join our speedboat dive trips to some of Koh Lanta's best dive sites and enjoy small groups, great personal service and short journey times on our fast boats.

Not yet a diver? Discover a whole new world with Discover Scuba Diving on Koh Lanta, or get certified with the Open Water Diver course on Koh Lanta.

If you're already a certified diver, take your diving knowledge and skills to the next level with the Advanced Open Water Diver course on Lanta.

Book online to save 10% on diving trips and scuba courses here on Koh Lanta.

Find Out More

More Marine Life References and Further Information


Diving, Snorkeling & PADI Courses

Send us an email and we'll get back to you as soon as possible.

  • Please let us know:

    • when will you arrive on Koh Lanta?
    • your previous dive experience?
    • which diving activities you are interesed in?
  • If you're already here on Lanta, you can also call us on +66 (0)89 050 3009