HomeFish encyclopediaRay-finned fishesPuffers and FilefishesPuffersSmooth blaasop Smooth blaasop (Lagocephalus inermis) Scientific name: Lagocephalus inermis Temminck & Schlegel, 1850 The Smooth blaasop (Lagocephalus inermis) is a marine fish of the family Tetraodontidae. Native range: Indo-West Pacific, Algoa Bay, South Africa to southern Japan. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 12-14; Anal spines: 0; Anal soft rays: 10 - 12. Dorsal part of body without prickles, belly covered with prickles. Greenish or dark grey above, silvery white below. Distinguished from other Lagocephalus species by the black gill opening.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameLagocephalus inermisFamilyTetraodontidae (Puffers)OrderTetraodontiformes (Puffers and Filefishes)ClassActinopterygii (Ray-finned fishes)Maximum length90.0EnvironmentMarine; demersalClimateTropicalDistributionIndo-West Pacific: Algoa Bay, South Africa to southern Japan.Conservation status (IUCN)Not EvaluatedThreat to humansPoisonous to eatResilienceLow, minimum population doubling time 4.5 - 14 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