HomeFish encyclopediaRay-finned fishesPerch-like fishGrunters or tigerperchesButler's grunter Butler's grunter (Syncomistes butleri) Scientific name: Syncomistes butleri Vari, 1978 The Butler's grunter (Syncomistes butleri) is a freshwater fish of the family Terapontidae. Native range: Oceania, Endemic to Australia. BiologyAdults inhabit slow or fast moving water of lagoons, streams and rivers, in clear or turbid conditions. Most commonly encountered in deeper sections of larger watercourses. Occur in lentic and lotic freshwater. Herbivorous species. Feed on filamentous algae. Breed between November and December when water temperatures rise to about 29?C. Sexual maturity is attained at 20-22 centimeters. Eggs are guarded and fanned by the male parent.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSyncomistes butleriFamilyTerapontidae (Grunters or tigerperches)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length28.0EnvironmentFreshwater; benthopelagicClimateTemperateDistributionOceania: Endemic to Australia.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (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