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Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the Batoidea ( rays and kin).
6 days ago · Sharks differ from other elasmobranchs, however, and resemble ordinary fishes, in the fusiform shape of their body and in the location of their gill clefts on each side of the head. Though there are exceptions, sharks typically have a tough skin that is dull gray in colour and is roughened by toothlike scales.
Jul 25, 2019 · Find out about the world's biggest and fastest sharks, how sharks reproduce, and how some species are at risk of extinction. Subscribe: http://bit.ly/NatGeoSubscribe #NationalGeographic #Sharks #...
The oceanic whitetip, porbeagle and three hammerhead species are some of the shark species of concern for WWF, where the impact of trade is contributing to declines in populations. Millions of these sharks continue to be fished annually to supply the persistent demand for their fins and meat.
Facts about many sharks from the eight orders of sharks from the Shark Research Institute (SRI). SRI conducts and sponsors rigorous, peer-reviewed field research about sharks and uses science-based information to educate and advocate for shark conservation policies and protections by the world’s governing bodies, including CITES.
Find out about the world's biggest and fastest sharks, how sharks reproduce, and how some species are at risk of extinction. Common Name: Sharks. Type: Fish. Size: 7 inches to 32.8 feet. Weight...
Jun 13, 2005 · Read on for more surprising shark facts compiled by National Geographic News: • Each year there are about 50 to 70 confirmed shark attacks and 5 to 15 shark-attack fatalities around the...
Introduction. There are more than 500 species of sharks swimming in the world’s ocean. Yet when most people think of these cartilaginous fish, a single image comes to mind: a large, sharp-toothed and scary beast. That generalization does sharks a huge disservice, as they have far more variety than that.
Jul 4, 2022 · Long portrayed in pop culture as remorseless people-killers, sharks in reality are no Hollywood monsters. Sharks are a diverse group of mostly predatory fish, including the largest living fish...
There are more than 400 different shark species, most of which can be found in coastal regions. They are present in every ocean of the world, with some species also inhabiting rivers. Sharks belong to the class of cartilaginous fish, along side rays and chimeras.
