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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[1] (or Selachii) and are the sister group to the Batoidea (rays and kin).
Sep 30, 2024 · 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.
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...
Jul 25, 2019 · Sharks can rouse fear and awe like no other creature in the sea. Find out about the world's biggest and fastest sharks, how sharks reproduce, and how some sp...
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...
By the early 2020s many of the world’s shark species had suffered tremendous population declines from being caught by accident (as bycatch) in commercial fishing nets and hooked lines, as well as being harvested on purpose to satisfy the demand for shark fin soup.
What is a great white shark? The great white shark is a type of mackerel shark from the Lamnidae family, which also includes mako sharks, salmon sharks, and porbeagle sharks.
- www.worldwildlife.org
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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.
Jun 9, 2017 · Sharks are found in every major body of saltwater in the world, but are more common in warmer waters. There are a small number of shark species that do thrive in fresh water, and certain...
