Fish ID: Fan Belly Leatherjacket

Leatherjacket fan belly leatherjacket hp
Family Filefish (MONACANTHIDAE)
species Monacanthus chinensis
size Up to 40cm
locality Kelpy reef and silty habitats
behaviour Hiding at the edge of the kelp
range Tropical and sub-tropical waters

Most easily distinguished by the large expandable ventral flap. But if this is not extended – as is the case here – check for a concave forehead – snout to dorsal spine.