Gourt > Recreation > Outdoors > Wildlife > Sharks
Sharks are a group (superorder Selachimorpha) of fish, with a full cartilaginous skeleton and a streamlined body, with normally 5, but up to 7 (depending on species) gill slits along the side of, or beginning slightly behind, the head (in some species, a modified slit called a spiracle, is located just behind the eye), dermal denticles covering the body to protect from damage, parasites and improve fluid dynamics, and rows of replaceable teeth in the mouth.
Characteristics
Sharks have keen olfactory senses, with some species able to detect as little as one part per million of blood in seawater. They are even more attracted to the chemicals found in the gut of many species, and often linger near or in sewage outfalls. Some species, such as nurse sharks, have external barbels that greatly increase their ability to sense prey. The short duct between the anterior and posterior nasal openings are not fused like in bony fish.
Shark eyes are similar to the eyes of other vertebrates, including similar lenses, corneas and retinas, though their eyesight is well adapted to their marine environment with the help of a tissue called tapetum lucidum. This tissue is behind the retina and reflects light back to the retina, thereby increasing visibility in the dark waters. The effectiveness of the tissue varies, with some sharks having stronger nocturnal adaptations. Sharks have eyelids, but they do not blink because the surrounding water cleans their eyes. To protect their eyes some have nictitating membranes. This membrane covers the eyes during predation, and when it is being attacked. However, some species, including the great white shark, Carcharodon carcharias do not have this membrane, but instead roll their eyes backwards to protect them.
More on [ Shark ]
Underwater Life :: Scuba Diving
Cartilaginous :: Fish
Oooooh, I see - Vampires are sharks.
morgandea (Rebecca Brown) Fri, 06 Nov 2009 12:18:07 -0000
Oooooh, I see - Vampires are sharks.
New video: Sharks @ Blue Jackets 11/4/09 http://bit.ly/3LtBNf
bestsportsvids (sportsvideos) Fri, 06 Nov 2009 12:17:14 -0000
New video: Sharks @ Blue Jackets 11/4/09 http://bit.ly/3LtBNf
Red Wings Win in Shootout: Hear from the Red Wings' Henrik Zetterberg after a 2-1 win over the Sharks. .. http://bit.ly/NSmCv (Video)
WebcastrSports (webcastr) Fri, 06 Nov 2009 12:15:15 -0000
Red Wings Win in Shootout: Hear from the Red Wings' Henrik Zetterberg after a 2-1 win over the Sharks. .. http://bit.ly/NSmCv (Video)
News| Sharks' Rob Blake Joins the Teal Fallen, Tests Blue Line Depth: Bleacher Report Rob Blake's .. http://bit.ly/3DkHgn
hue_blue (Yancey Grantham) Fri, 06 Nov 2009 12:12:42 -0000
News| Sharks' Rob Blake Joins the Teal Fallen, Tests Blue Line Depth: Bleacher Report Rob Blake's .. http://bit.ly/3DkHgn
Sale Sharks: The 2009 season sees the arrival of a new coaching team for the Sharks. Lead by the Director of Ru.. http://tinyurl.com/yda8wyj
greenekingipa (Greene King IPA) Fri, 06 Nov 2009 12:11:33 -0000
Sale Sharks: The 2009 season sees the arrival of a new coaching team for the Sharks. Lead by the Director of Ru.. http://tinyurl.com/yda8wyj
Surfing With Sharks #hosting #web #domain #seo #marketing #design #news http://hosting-n1.com/?p=6503
n0teb00k (n0teb00k) Fri, 06 Nov 2009 12:04:16 -0000
Surfing With Sharks #hosting #web #domain #seo #marketing #design #news http://hosting-n1.com/?p=6503
Alaska Shark Assessment Program - Investigates the increase of salmon sharks and Pacific sleeper sharks in Alaskan waters.
Bimini Biological Field Station - Information on classes offered at the shark research field station located on Bimini, shark information, this site is headed by Sonny Gruber.
Meta Description: [ The BBFS Sharklab is a world famous facility for shark research and marine biology internships. Owned and operated by renowned shark biologist, Dr. Samuel H. Gruber. The Sharklab is dedicated to the research and conservation of sharks, and the ecosystems in which they are a part of. ]
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Canadian Shark Research Laboratory - An information source on sharks and shark fisheries in Atlantic, Canada.
Captain Toms New England Shark Species - Information and photos on shark species found in the waters around New England, including the blue, thresher, mako and porbeagle sharks.
Meta Description: [ Shark species in New England ]
Discovery Channel's Shark Week - Information on a variety of sharks, from the Great Whites to Hammerheads. Includes interactive games and shark quiz along with expert shark attack answers.
Meta Description: [ Take a deeper look into the world of sharks with Discovery Channel's Shark Week. ]
Fiona's Shark Mania - Shark resources and information, including graphics and clip art, stories, links, and the SHARK-L mailing list.
Meta Description: [ This is an ever-unfolding space devoted to those
magnificent animals -- sharks. This shark site features a Richard Ellis Gallery of Sharks (illustrations and informative text), the most comprehensive
list of shark links on the Web, and information on SHARK-L, the mailing
list. On the lighter ... ]
Florida Sawfish - Dedicated to Florida Sawfish. Includes history, information, and pictures.
Gerber's Shark Gallery - Information on different species of sharks, Mediterranean species list, Great White, and shark attacks. Illustrated with drawings.
Meta Description: [ Information about sharks and their behaviour. Shark attacks, Biology, Mediterranean sea species, Great White Shark. ]
International Shark Attack File - A database of shark attacks as well as information on how, why, and where sharks attack, and how to avoid becoming a victim.
Meta Description: [ Florida Museum of Natural History Ichthyology Department homepage. This page contains, educational sections about the biology, ecology and conservation of fishes and sharks. A rich photo gallery features the work of world-renowned underwater photographers. Host for International Shark Attack File... ]
Masterpiece Of Evolution - the Shark - Biology, stories, photos, and links.
Mote Marine Laboratory - Located in Sarasota, Florida and provides shark tank interactive camera, with information on sharks and other marine fish.
Natal Sharks Board - Service organisation that protects beach users in KwaZulu-Natal against shark attack. Site has information about shark attack-prevention and shark research.
Meta Description: [ natal sharks board,natal anti-shark measures, shark attack, sharks, sardines, south africa, fishing, fishing for sharks, finning, shark fins, shark nets, teeth, shark teeth, gills, nsb, durban coast, black december ]
NOVA Online: Island of the Sharks - Information about sharks and sharkmasters.
Meta Description: [ NOVA Online presents Island of the Sharks ]
Shark Attack Photos - Shark attack photo gallery and brief information.
Meta Description: [ Shark attack victims photo gallery, including attacks by region and great white shark attacks. Other shark attack related links including Jaws and many other popular shark related subjects. ]
Shark Attacks - Information about shark attacks with photos of victims and sharks. Shark attack news section and discussion board.
Meta Description: [ All Shark Attacks news online, Great White, Sharks Victims photo Gallery,Pictures,Photos,Attack Stories,school report,Bull,Maco,Tiger,Sand,Whale,Jaws ]
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Shark Information from Australia - Information about sharks and their behaviour, including stories, attacks, photos, research, and myths.
Shark Insider - Index of GORP's articles related to sharks, including where to see them, how to see them safely, and some hair-raising tales of close encounters with sharks around the world.
Meta Description: [ A deep dive into the world of the oceans top predator.... ]
Shark Predation on Sable Island Seals - Short article on shark predation on Sable Island, Nova Scotia, Canada.
Shark Research Committee - Behavior and ecology of sharks indigenous to waters off the Pacific Coast, with particular emphasis on potentially dangerous species.
Meta Description: [ White Shark Diet, Distribution, Behavior, Attacks on Surfers, Divers, Kayakers, Swimmers, Inanimate Objects, Attack Statistics, and Encounters. ]
Shark Survivor: Recognizing 8 Different Shark Species - Descriptions and illustrations of 8 dangerous shark species know to attack man with rankings of their danger level.
Meta Description: [ Recognize different sharks and their behavior. This site has illustrations and ranks shark attacks by their occurrence. ]
Shark Tagging and Shark Conservation Efforts. - Shark Tagging in cooperation with the Apex Predator Program. Site dedicated to the conservation of sharks. Pictures of many sharks being tagged including Tiger, Bull, Nurse, Dusky, and Hammerheads are tagged by hand and released back into the Gulf of Mexico. Many Shark tagging questions answered here.
Sharks - Introduction to these predatory marine animals, with additional information regarding shark anatomy, senses, and diversity.
Sharks of Hawaii - An introduction to sharks that are prevalent in Hawaiian waters - especially those species that swim inshore and are aggressive to humans. Safety information about avoiding shark attack is provided.
Meta Description: [ An introduction to the common, and particularly aggressive to humans, species in our ocean waters. Particular attention is paid to the inshore varieties. Safety information is provided about attack. ]
Sharks off the Delaware and Ocean City Maryland Beaches - A look at the most common sharks found off the Delaware and Ocean City Maryland beaches, most notably the common hammerhead, mako, sand shark, spiny dogfish and smooth dogfish sharks, and sandbar shark.
Meta Description: [ A look at the most common sharks found off the Delaware and Ocean City Maryland beaches, most notably the common hammerhead, mako, sand shark, spiny dogfish and smooth dogfish sharks, and sandbar shark. ]
The Great White Shark - Comprehensive guide to nature's most fearsome predator, the Great White Shark.
Meta Description: [ The Web's most comprehensive guide to the Great White Shark ]
The Shark Research Institute - A non-profit, international, scientific organization dedicated to the conservation of sharks. The Institute provides consultants, speakers for schools, clubs and conferences, and serves as a resource for the media, providing slides, videos and data.
Meta Description: [ Shark Research Institute, shark week, tiburon, shark research organization, conducts and sponsors research on sharks and promotes the conservation of sharks. ]
The Shark Trust - Information on many different species of shark, species lists, conservation information, great white and shark attack.
WorldShark.com - Dedicated to educating the world on sharks and promoting their conservation. Includes fact sheets, resource links, membership details, newsletter and merchandise
Meta Description: [ WorldShark.com is a resource dedicated to educating the world on Shark species and promoting Shark conservation. ]
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