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shark : any of numerous mostly marine cartilaginous fishes of medium to large size that have a fusiform body, lateral branchial clefts, and a tough usually dull gray skin roughened by minute tubercles and are typically active predators sometimes dangerous to humans — Webster   See also   OneLook


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 rays. H

Sharks range in size from the small dwarf lanternshark (Etmopterus perryi), a deep sea species of only 17 centimetres (6.7 in) in length, to the whale shark (Rhincodon typus), the largest fish in the world, which reaches approximately 12 metres (40 ft) in length. Sharks are found in all seas and are common to depths of 2,000 metres (6,600 ft). They generally do not live in freshwater although there are a few known exceptions, such as the bull shark and the river shark, which can survive and be found in both seawater and freshwater. Sharks have a covering of dermal denticles that protects their skin from damage and parasites in addition to improving their fluid dynamics. They have numerous sets of replaceable teeth. — Wikipedia

Shark (Encyclopædia Britannica)

Sharks (Florida Museum of Natural History)

Sharks (One Zoom)
Shark (WolframAlpha)




Ichthyology, also called fish science, is the branch of zoology devoted to the study of fish, including jawless fish (Agnatha), cartilaginous fish (Chondrichthyes) and bony fish (Osteichthyes). According to FishBase, 33,400 species of fish had been described as of October 2016, with approximately 250 new species described each year. — Wikipedia

Ichthyology (Encyclopædia Britannica)

Florida Museum of Natural History (YouTube Channel)
Florida Museum of Natural History (Official Website)

Florida Program for Shark Research (Florida Museum of Natural History)
Pacific Shark Research Center




DDC: 597.3 Elasmobranchii: Sharks, Rays, etc. (Library Thing)
Subject: Sharks (Library Thing)

Subject: Sharks (Open Library)

LCC: QL 638.95.S7 Sharks (UPenn Online Books)
Subject: Sharks (UPenn Online Books)

LCC: QL638.95.S7 Sharks (Library of Congress)
Subject: Sharks (Library of Congress)

Subject: Sharks (WorldCat)




MERLOT: Multimedia Educational Resource for Learning and Online Teaching
OER Commons: Open Educational Resources



Zoologists and Wildlife Biologists (CareerOneStop, U.S. Department of Labor, Employment and Training Administration)


American Elasmobranch Society
American Society of Ichthyologists and Herpetologists
Zoological Association of America
Association of Zoos and Aquariums


Sharks (EurekaAlert, American Association for the Advancement of Science)
Sharks (bioRxiv: Preprint Server for Biology, Cold Spring Harbor Laboratory)
Sharks (Science Daily)
Sharks (Science News)
Sharks (
Sharks (NPR Archives)


Fun Facts About Shocking Sharks (Northeast Fisheries Science Center, NOAA Fisheries)
Fish & Sharks (Northeast Fisheries Science Center, NOAA Fisheries)


Shark (


More News … - latest science and technology news stories internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • The coming flood: Meet the flood watchers
    on March 31, 2023 at 3:29 pm

    Floods in California rarely attract the sort of attention that earthquakes, wildfires or even shark attacks do. Perhaps it has something to do with the severity of an unprecedented, yearslong drought that is far from over. This winter's deluge—particularly in the northern and central regions—was a jolting reminder that rainfall remains a deadly, destructive force to be reckoned with, though it has been many decades since the Golden State experienced truly catastrophic flooding.

  • Asian swamp eels spread in the Everglades:...
    on March 30, 2023 at 5:40 pm

    For a crayfish in the Florida Everglades, its worst nightmare is three feet long, dark brown and pure muscle, with a mouth like a vacuum that sucks up nearly everything it can find—tiny fish, small shellfish, turtle eggs and frogs.

  • Rare video of wombats offers a glimpse into the...
    on March 29, 2023 at 5:40 pm

    If you look at where wombats deposit their poo, you realize they must be able to perform some surprising acrobatics. It has always amazed me to see wombat scats on top of grass tussocks or logs, because I've always wondered how the stocky creatures must have maneuvered themselves to put it there.

  • Temperature-dependent adaptations of whale shark...
    on March 28, 2023 at 3:00 pm

    Researchers in Japan led by the RIKEN Center for Biosystems Dynamics Research, Kobe and Osaka Metropolitan University, Osaka, have discovered that whale shark vision has uniquely temperature-dependent adaptations unseen in any other lifeform. They have detailed the findings in a study titled "Whale shark rhodopsin adapted to deep-sea lifestyle by a substitution associated with human disease," published in the Proceedings of the National Academy of Sciences.

  • Conserving wildlife can help mitigate climate...
    on March 28, 2023 at 12:44 pm

    Protecting wildlife across the world could significantly enhance natural carbon capture and storage by supercharging ecosystem carbon sinks, a new study led by Yale School of the Environment Oastler Professor of Population and Community Ecology Oswald Schmitz has found.


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