Opistognathus aurifrons
Encounter Rate
Spotting Difficulty
Best Season
Year-round
Depth Range
3-25 meters
The yellowhead jawfish is one of Komodo's most charming and behaviourally fascinating small fish, a burrowing species that constructs and maintains elaborate vertical tunnels in sandy and rubble substrates. These small fish, reaching about 10 centimetres, are named for their pearly yellow to blue head that contrasts with their elongated pale body. In Komodo, jawfish are found at sandy sites adjacent to reef structures, where they hover vertically above their burrows, darting out to snatch passing zooplankton before retreating tail-first into the safety of their tunnel at the slightest disturbance. Their burrow construction is a marvel of engineering — they use their oversized mouth to excavate sand and rubble, carrying mouthful after mouthful of material to create and maintain the tunnel. But the most remarkable behaviour is their mouthbrooding — males carry the fertilised egg mass entirely within their mouth for the full incubation period, regularly rotating and aerating the eggs with gentle jaw movements. During this period, the male cannot feed and relies on stored energy reserves. Watching a jawfish hover and duck in and out of its burrow is endlessly entertaining.
Average Size
6-8cm
Size Range
3-10cm
Maximum Size
10cm
Feeds on zooplankton snatched from the water column above its burrow. Darts out to capture individual plankton organisms before retreating tail-first into its tunnel.
The yellowhead jawfish is one of Komodo's most charming and behaviourally fascinating small fish, a burrowing species that constructs and maintains elaborate vertical tunnels in sandy and rubble substrates. These small fish, reaching about 10 centimetres, are named for their pearly yellow to blue head that contrasts with their elongated pale body. In Komodo, jawfish are found at sandy sites adjacent to reef structures, where they hover vertically above their burrows, darting out to snatch passing zooplankton before retreating tail-first into the safety of their tunnel at the slightest disturbance. Their burrow construction is a marvel of engineering — they use their oversized mouth to excavate sand and rubble, carrying mouthful after mouthful of material to create and maintain the tunnel. But the most remarkable behaviour is their mouthbrooding — males carry the fertilised egg mass entirely within their mouth for the full incubation period, regularly rotating and aerating the eggs with gentle jaw movements. During this period, the male cannot feed and relies on stored energy reserves. Watching a jawfish hover and duck in and out of its burrow is endlessly entertaining.
This species plays an important role in the marine ecosystem of Komodo National Park. Responsible diving practices help protect these animals and their habitat for future generations.
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They inhabit sandy and rubble areas adjacent to reef structures. Wainilu, Secret Garden, and sandy patches around Sabolon and Sebayur are good locations. Your guide will know current resident burrow locations.
