HomeFish encyclopediaSharks and RaysBullhead and Horn sharksBullhead / horn / Port Jackson sharksGalapagos bullhead shark Galapagos bullhead shark (Heterodontus quoyi) Scientific name: Heterodontus quoyi Fr?minville, 1840 The Galapagos bullhead shark (Heterodontus quoyi) is a marine fish of the family Heterodontidae. BiologyInhabits sand flat and rocky, boulder strewn reef areas, with sand between outcroppings in inshore continental and insular waters. Rests motionless on the bottom. Is docile, non-aggressive and a poor swimmer. Nocturnal. Feeds on shellfish, crabs, and small invertebrates. Oviparous. Size at birth (for a newly hatched male) is 17 cm.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHeterodontus quoyiFamilyHeterodontidae (Bullhead / horn / Port Jackson sharks)OrderHeterodontiformes (Bullhead and Horn sharks)ClassElasmobranchii (Sharks and Rays)Maximum length107Depth range3–40 m (10–131 ft)EnvironmentMarine; reef-associated; depth range 3 - 40 m, usually 16 - 30 mClimateTropicalDistributionEastern Pacific: Peru (including offshore islands) and the Galapagos Islands. There might be another Heterodontus species from Peru which is Heterodontus peruanus, but these two cannot be separated as of this time for lack of materials examined.Conservation status (IUCN)Data deficient (DD)Threat to humansTraumatogenicUsesFisheries: of no interestResilienceLow, minimum population doubling time 4.5 - 14 years (Fec assumed to be SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026