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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).
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 #...
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...
3 days ago · Shark, any of numerous species of cartilaginous fishes that make up the order Selachii (class Chondrichthyes). Most species have a tough skin that is dull gray in color and roughened by toothlike scales. The mouth contains sharp triangular teeth. Sharks lack a swim bladder and must swim to keep from sinking.
Jul 4, 2022 · Sharks are a diverse group of mostly predatory fish, including the largest living fish, with skeletons made of cartilage. They have plied the seas since before the dinosaurs lived and play...
With over 500 species of sharks, there are many different shark sizes and shapes. The largest shark (and also largest fish) is the gentle whale shark (Rhincodon typus), which can reach lengths of 39 feet (12 meters).
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.
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.
What are sharks? Sharks are elasmobranchs, a group of animals that includes rays and skates, whose members have a skeleton made of cartilage, rather than bone, and, unlike most other fish, lack a swim bladder. How many species of shark are there? There are more than 500 species of sharks…
Jun 13, 2005 · A round-up of facts about one of the most iconic fishes. By Brian Handwerk. June 13, 2005. • 7 min read. The United States averages just 16 shark attacks each year and slightly less than one...
