HomeFish encyclopediaRay-finned fishesPuffers and FilefishesPuffersSlender blaasop Slender blaasop (Torquigener balteus) Scientific name: Torquigener balteus Hardy, 1989 The Slender blaasop (Torquigener balteus) is a marine fish of the family Tetraodontidae. Native range: Western Indian Ocean, Natal, South Africa. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 8-9; Anal spines: 0; Anal soft rays: 7. Specimens in alcohol greyish brown with small pale spots and smaller pale dots above; white stripe on posterior part of upper lateral line; belly and fins white.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameTorquigener balteusFamilyTetraodontidae (Puffers)OrderTetraodontiformes (Puffers and Filefishes)ClassActinopterygii (Ray-finned fishes)EnvironmentMarine; demersalClimateSubtropicalDistributionWestern Indian Ocean: Natal, South Africa.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, 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