News tagged with fins
Jurassic salamanders with stomach contents found from Inner Mongolia
Paleontologists from Chinese Academy of Sciences reported two Jurassic salamanders with stomach contents from Daohugou, Ningcheng County, Inner Mongolia, China, as reported in Chinese Science Bulletin online ...
Other Sciences / Archaeology & Fossils
Feb 06, 2012 |
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German engineers mimic humpback whale to increase helicopter stability
(PhysOrg.com) -- Whale researchers have known for some time that humpback whales are able to perform feats of underwater acrobatics that belie their huge size and that some of that ability is partly due to ...
Feb 01, 2012 |
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New study showing pelvic girdles arose before the origin of movable jaws
Almost all gnathostomes or jawed vertebrates (including osteichthyans, chondrichthyans, ‘acanthodians’ and most placoderms) possess paired pectoral and pelvic fins. To date, it has generally been ...
Other Sciences / Archaeology & Fossils
Jan 10, 2012 |
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Fisherman's gold: Shark fin hunt empties west African seas
Retired fisherman Sada Fall is upbeat. His two sons are returning from sea with a boatload of "gold", as he calls shark fins, whose value has near-obliterated the ocean's top predator in these seas.
Jan 08, 2012 |
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Singapore supermarket to stop selling shark fin
Singapore's largest supermarket chain will stop selling shark fin products from April after an inflammatory comment by one of its suppliers triggered calls for a boycott from activists and the public.
Jan 06, 2012 |
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Hong Kong's shark fin traders feel pressure to change
The owner of Shark's Fin City, a dried fin wholesaler in Hong Kong's quarter for all things shrivelled, says there are only a few people who know the truth about sharks, and he's one of them.
Nov 28, 2011 |
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The shark, a predator turned prey
Sharks may strike terror among swimmers at the beach but the predators are increasingly ending up as prey, served up in fish-and-chips shops, sparking concern among environmentalists.
Nov 25, 2011 |
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Conservation body agrees to protect silky sharks
(AP) -- Delegates at an international conservation meeting agreed Saturday on a measure mandating that silky sharks accidentally caught in fishing gear be released back into the sea alive, marine advocacy ...
Nov 19, 2011 |
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New photos reveal Taiwan shark fishing
A US-based environmental group on Wednesday expressed concern over new photos that seem to show the killing of large numbers of "biologically vulnerable" sharks by fishermen in Taiwan.
Oct 19, 2011 |
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Lungfish provides insight to life on land
A study into the muscle development of several different fish has given insights into the genetic leap that set the scene for the evolution of hind legs in terrestrial animals. This innovation gave rise to the tetrapods—four-legged ...
Oct 04, 2011 |
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Sharks in Australia's Great Barrier Reef in decline
Sharks inhabiting Australia's Great Barrier Reef are in decline due to over fishing, researchers warned, after developing what they said was a new way to measure falling numbers.
Sep 28, 2011 |
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Sharks saved from soupy fate set free at sea
Saved from the soup bowl at a Thai restaurant, the baby shark wriggled out of the bag and into the open sea -- a rare survivor of a trade that kills millions of the predators each year.
Sep 06, 2011 |
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Malaysia Borneo state wants ban on shark fishing
A Malaysian state on Borneo island, known for its world-class dive sites, is seeking to ban shark fishing to protect the species, which draws thousands of tourists each year, a minister said Monday.
Aug 29, 2011 |
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Australia expecting massive whale watching season
Australia marked the start of its whale-watching season Wednesday with predictions that some 4,000 of the giant animals will be spotted as they make their way along the coast during winter.
Jun 01, 2011 |
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Scientists can track origin of shark fins using 'zip codes' in their DNA
An international team of scientists, led by the Institute for Ocean Conservation Science at Stony Brook University, has used DNA to determine that groups of dusky sharks (Carcharhinus obscurus) and copper ...
Apr 27, 2011 |
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Fin
A fin is a surface used for stability and/or to produce lift and thrust or to steer while traveling in water, air, or other fluid media, (in other words, a foil (fluid mechanics)). The first use of the word was for the limbs of fish, but has been extended to include other animal limbs and man-made devices. Fins, as with other foils, operate in fluids such as water or air.
Fins are seen both in nature and in manmade iterations.
Swimming water animals such as fish and cetaceans actively use pectoral fins for maneuvering, and dorsal fins contribute stability as the animal swims, propelling and maneuvering with its tail, itself recognizable as a fin.
The fin on fixed-wing aircraft is known as a vertical stabilizer. Fins are also seen used as e.g., fletching on arrows and at the rear of some bombs, missiles, rockets, and self-propelled torpedoes. These are typically "planar" (shaped like small wings), although grid fins are sometimes used in specialized cases.
Examples of fins include:
For more information about Fin, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
