shark shark species requiem shark family found worldwide species favors clear reef environments oceanic islands abundant shark species large species reaches reef shark typical reef shark shape difficult distinguish shark grey reef shark identifying character species tall dorsal fin slightly rounded tip originates rear tips pectoral fins sharks active predators encountered large groups feed mainly dwelling bony fishes cephalopods larger individuals varied diet consuming sharks marine sea lions garbage requiem sharks reproduction viviparous females bearing litters pups years juveniles tend remain shallow water avoid predation adults sharks bold behaved aggressively humans regarded dangerous assessed species near threatened slow reproductive rate heavy fishing pressure range taxonomy phylogeny shark originally described subsequent authors moved species genus long specific epithet placed shark shark center group major group consisted shark caribbean reef shark shark shark oceanic shark large triangular toothed sharks defined presence ridge dorsal fins based data reaffirmed integrity group additions silky shark blue shark closest relatives shark found oceanic blue sharks distribution habitat shark found mainly tropical oceanic islands atlantic_ocean occurs bermuda indian_ocean known walter southern madagascar pacific_ocean occurs lord howe island reports species continental waters baja california guatemala colombia eastern australia sharks generally found continental shelves near coast preferring rugged reef habitats clear water strong currents known rocky species capable crossing open ocean islands reported land juveniles seldom venture deeper adults reported depth description larger species genus shark commonly reaches long maximum length probably recorded maximum length questioned authors maximum recorded weight long female species slender streamlined body typical requiem sharks snout wide rounded indistinct anterior nasal flaps eyes round medium size mouth usually contains tooth rows range jaws plus tooth jaw halves meet upper teeth stout triangular shape lower teeth narrower upper lower teeth edges dorsal fin tall moderately shaped origin pectoral fin rear tips followed low ridge running second dorsal fin second dorsal fin originates anal fin pectoral fins large pointed tips coloration brownish gray white faint white stripe sides edges fins darker prominently marked shark distinguished shark having taller second dorsal fins larger teeth distinguished grey reef shark having robust body pointed dorsal fin tip characters difficult field similar species different numbers tail shark shark grey reef shark biology ecology shark abundant shark shallow island waters original description species noted schooner taken adult sharks thousands seen water isolated resident sharks described shark populations atlantic_ocean locations form large true schools group interactions sharks dominant sharks sharks equal size confronted shark perform threat display similar grey reef shark shark performs exaggerated rolling swimming motion lowering pectoral fins gills jaw shark swing head perceived threat field vision known parasite shark shark skin account seen rough skin shark rid parasites feeding primary food sharks benthic bony fishes including sea bass occasionally surface dwelling prey squid sharks grow larger consume increasing numbers rays smaller sharks including species crustaceans items leaves coral rocks garbage species observed attacking fur seals sea lions marine collecting fishes noted juvenile sharks surrounded boat multiple individuals rushing virtually trailing water striking boat marker sharks slowed fish shark followed boat water shallow backs exposed life history like requiem sharks shark exhibits viviparous mode reproduction developing embryos sustained connection formed depleted yolk sac females bear young years mating takes place january march time caused male courtship bites appear females gestation period estimated year spring following females shallow nursery areas birth pups size birth reported observations free swimming juveniles small long eastern pacific suggest birth size varies geographically juvenile sharks remain shallow water avoid predation larger adults males mature long years old females mature long years old sex thought reproduce years age lifespan species years human interactions persistent shark regarded potentially dangerous humans live aboard boats divers wolf darwin northernmost islands week specifically dive open water sharks accumulate numbers incidents reported known approach close swimmers showing interest swim fins hands drawn large numbers fishing activities observed soon fish caught rush sharks notwithstanding blows boat hooks monsters seizing taking away half fish hooked reported small sharks distance gradually approached aggressive popular methods sharks proved unsuccessful situation eventually escalated point divers retreat water sharks easily driving away physically results shark follow weapons trigger feeding shark confirmed attacked people fatal attack second fatal attack north shore non fatal attack bermuda assessed shark near threatened low reproductive rate limits capacity withstand population specific data available species certainly caught commercial fisheries operating parts range meat said excellent quality common areas hawaii shark sites central_america fragmented distribution means regional populations risk populations protected marine reserves
Galapagos shark