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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 ]
@cristiecakes I got the prize. It was a shark. My son and I just munched on tha crackerjaks.
djnotorious (Dj Notorious) Thu, 05 Nov 2009 18:31:18 -0000
@cristiecakes I got the prize. It was a shark. My son and I just munched on tha crackerjaks.
Tess's name got pulled from the hat, giving her the part she wanted in the 3rd grade play. She's tickled pink to be the "Blue" Shark.
cjordahl (cjordahl) Thu, 05 Nov 2009 18:30:52 -0000
Tess's name got pulled from the hat, giving her the part she wanted in the 3rd grade play. She's tickled pink to be the "Blue" Shark.
Anyone remember Tiko and the Shark?
LuckyRadish (Chuck Gamble) Thu, 05 Nov 2009 18:29:29 -0000
Anyone remember Tiko and the Shark?
Guys, it's no longer cool to tweet about liking "Party In The USA". We all love the song, that moment has jumped the shark. Move along, now.
brian_shoemaker (Brian Shoemaker) Thu, 05 Nov 2009 18:28:50 -0000
Guys, it's no longer cool to tweet about liking "Party In The USA". We all love the song, that moment has jumped the shark. Move along, now.
@rocksteady1 lol that's a mess but I could go for some shark bar right about now!
DisBeatIzSik (Saquana) Thu, 05 Nov 2009 18:27:23 -0000
@rocksteady1 lol that's a mess but I could go for some shark bar right about now!
RT @sharksandlasers Call for shark net ban on Gold Coast beaches http://bit.ly/4rvPIn
SharkGoddess (SharkGoddess ) Thu, 05 Nov 2009 18:26:38 -0000
RT @sharksandlasers Call for shark net ban on Gold Coast beaches http://bit.ly/4rvPIn
Baby Shark Fry - Pan-fried shark served with a tomato and onion sauce. From iChef.
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Blackened Cajun Shark - Shark steaks dusted with cajun spice mix and pan-seared in butter; from Eat Dangerously Cookbook.
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Broiled Spicy Shark - Shark fillets marinated in lemon juice, herbs, and chili sauce, then broiled. From iChef.
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Exotic Fish Steaks with Marmalade Sauce - Shark steaks served with an orange and soy sauce; cooked on the stove-top or in a microwave. May use tuna or swordfish for variation.
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Mako Shark with Anchovy and Caper Sauce - Broiled, marinated shark fillets served with a tomato, anchovy, and caper sauce.
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Oven-Fried Shark - Baked shark filets coated with herbed bread crumbs.
Poached Shark Remoulade - Oven-poached shark filets. Includes instructions for making the remoulade sauce.
Shark Amandine - Pan sauteed shark served topped with almonds and bacon.
Shark Kabobs - Broiled shark and pineapple with an orange juice and soy marinade; from Arielle's Recipe Archives.
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Shark Kebabs with Orange-Avocado Salsa - Shark marinated in spicy orange juice, broiled and served with salsa made with oranges, avocado, and jalapeno pepper.
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Shark Marseillaise - Shark cooked in a tomato and wine sauce.
Shark Steaks au Poivre - Sauteed shark served with a Cognac and cream sauce.
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Shark Steaks Honolulu-Style - Shark marinated in pineapple juice, garlic, and basil, then grilled.
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Shark with Tomato-Fresh Ginger Sauce - Marinated shark stir-fried with mushrooms.
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