HomeFish encyclopediaRay-finned fishesPerch-like fishGrunters or tigerperchesDrysdale grunter Drysdale grunter (Syncomistes rastellus) Scientific name: Syncomistes rastellus Vari & Hutchins, 1978 The Drysdale grunter (Syncomistes rastellus) is a freshwater fish of the family Terapontidae. Native range: Oceania, Endemic, known from the northern coastal drainages, western Australia; Gibb and Drysdale Rivers. BiologyAdults inhabit larger streams rather than small tributaries, forming schools in rock pools and over sand bottoms. They retreat to crevices when threatened. Feed on filamentous algae by grazing on rocks.. Sometimes form mixed shoals with S. trigonicus. Breed during the late dry or early wet season (October to December). Eggs are guarded and fanned by the male parent. Aquarium conditions: pH=7.5, H=12, 26?C, egg layer, peaceful community fish, plant and rock cover.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSyncomistes rastellusFamilyTerapontidae (Grunters or tigerperches)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length15.0EnvironmentFreshwater; benthopelagic; non-migratoryClimateTropicalDistributionOceania: Endemic, known from the northern coastal drainages, western Australia; Gibb and Drysdale Rivers.Conservation status (IUCN)Lower Risk: near threatened (LR/nt)Threat to humansHarmlessUsesFisheries: of no interest; aquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026