HomeFish encyclopediaRay-finned fishesPerch-like fishDragonetsDeep-water dragonet Deep-water dragonet (Synchiropus monacanthus) Scientific name: Synchiropus monacanthus Smith, 1935 The Deep-water dragonet (Synchiropus monacanthus) is a marine fish of the family Callionymidae. Native range: Western Indian Ocean and Southeast Atlantic, Zanzibar, Tanzania to Port Alfred, South Africa. BiologyDorsal spines (total): 4; Dorsal soft rays (total): 8; Anal spines: 0; Anal soft rays: 7. Body greenish and reddish brown above, whitish below; fins with violet streaks distally. 1st dorsal fin of males high, with oblique dark bands.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSynchiropus monacanthusFamilyCallionymidae (Dragonets)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length13.0Depth range175–428 m (574–1404 ft)EnvironmentMarine; bathydemersal; depth range 175 - 428 mClimateDeep-waterDistributionWestern Indian Ocean and Southeast Atlantic: Zanzibar, Tanzania to Port Alfred, South Africa.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Assuming tmax>3) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026