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(Rachycentridae )

Jacks, Runners & Trevallies Moonfishes

The family Rachycentridae contains a single genus, Rachycentron, of which there is a single species, Rachycentron canadum.

The single member of this family is often referred to as a Cobia, however other common names include Black Kingfish, Black Salmon, Ling and Lemonfish.

The family Rachycentridae resembles its close relatives, the remoras of the family Echeneidae, however they lack the remora's dorsal sucker and have a more stout body.

1 species found on this page.


Rachycentron canadum

Cobias are swift-moving, voracious, predatory fish growing up to 1.8 m in length. The lower jaw protrudes beyond the upper jaw and the head is rather flat. This is a dark coloured fish with brown sides, each with two long brown stripes. The belly is often a lighter brownish, yellowish colour.

Cobia (Rachycentron canadum) @ Koh Haa

Rachycentron canadum @ Koh Haa

The distinctive dorsal fin, with several short spines and a long, soft ray, together with the horizontally carried pectoral fins and long upper tail fin lobe give this species the profile of a shark.

Cobia (Rachycentron canadum) @ Koh Haa

Rachycentron canadum @ Koh Haa

Cobias feed on crabs, fishes and squid, and are often found over sand and rubble reef bottoms or in small schools accompanying whale sharks, or other large marine animals such as large rays.

Diving with Cobia

Spot Cobia 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.

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