HomeFish encyclopediaSharks and RaysGround sharksRequiem sharksSmalltail shark Smalltail shark (Carcharhinus porosus) Scientific name: Carcharhinus porosus Ranzani, 1839 The Smalltail shark (Carcharhinus porosus) is a brackish-water fish of the family Carcharhinidae. BiologyFound in the continental shelves, preferably over muddy bottoms, and especially in estuaries. Feeds mainly on small fishes including young hammerhead and sharpnose sharks, and shrimps. Viviparous, with 2 to 7 young in a litter. Size at birth between 31 and 40 cm. Utilized fresh for human consumption and processed for fishmeal, and liver extracted for oil.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCarcharhinus porosusFamilyCarcharhinidae (Requiem sharks)OrderCarcharhiniformes (Ground sharks)ClassElasmobranchii (Sharks and Rays)Maximum length150Common length90.0Depth range36 m (118 ft)EnvironmentMarine; brackish; demersal; depth range ? - 36 mClimateSubtropicalDistributionWestern Atlantic: northern Gulf of Mexico to southern Brazil (excluding the Caribbean islands) and Uruguay. Eastern Pacific: Gulf of California to Peru, not at offshore islands. Specimens of porosus from Borneo, Viet Nam and Thailand may represent an undescribed small species of Carcharhinus.Conservation status (IUCN)Data deficient (DD)Threat to humansHarmlessUsesFisheries: minor commercialResilienceVery Low, minimum population doubling time more than 14 years (K=0.08; tm=6; tmax=12; assuming Fec SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026