Gobies, Blennies, and Triplefin: The Mischievous Inhabitants of the Shallow Waters

These fish from shallow coastal waters, found in all the seas of the world, often bring joy and wonder during our diving or snorkeling outings. Gobies, blennies, and triplefins are fascinating species, but how can you tell them apart? With a few key elements, an attentive diver can easily make the distinction.

These coastal fish, found in all the seas of the world, often bring joy and wonder during our diving or snorkeling outings. Gobies, blennies, and triplefin fish are fascinating species, but how can you tell them apart? With a few key elements, an attentive diver can easily make the distinction.

A curious fish emerges from vibrant coral, illustrating the beauty of the underwater world.
The secretary blenny, Acamthemblemaria maria, is a small blenny measuring just 3 cm, with large eyes rimmed in yellow-green. Found in the Caribbean, it can take shelter in a coral hole.
Photo: Claire Jeuffroy.

Distinction between Gobies, Blennies, and Triplefins

Morphological Characteristics

  • Gobies : They are distinguished by two dorsal fins and fused pelvic fins forming a suction cup disc. Their snout is short, and their eyes are positioned high on the head. Pores and mucous channels, visible upon observation, help identify the species. Gobies can reach up to 50 cm, but most measure less than 10 cm.
  • Blennies : Unlike gobies, blennies have a single long dorsal fin. Their elongated body is scale-less, and their pelvic fins, present in almost all species, are distant from the pectoral fins. Blennies, generally measuring 3 to 15 cm, can reach 50 cm for the serpent blenny, Xiphasia setifer.
Colorful fish swimming among underwater algae, ideal for diving enthusiasts.
The horned blenny, Parablennius pilicornis, is a regular inhabitant of shallow coastal waters. This blenny, native to the Atlantic, has gradually established itself in the Mediterranean. Recognizable by its network of clear honeycomb lines on its cheeks, it can display various colorations.
Photo: Dominique Barray
  • Triplefins : These fish are recognized by their dorsal fin divided into three parts, with the first part being pointed. They have elongated scales on their body and average about 6 cm, although some individuals can reach 25 cm.

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