Almost all seafood fans never felt they did not eat crabs and sea creatures will argue that this one is very tasty. This is not a joke, but actually a real incident in Alaska, North America. Crabs in this area so special menu is delicious eaten by domestic or foreign tourists. Uniquely, the crab "killer" is not for crabs that we often see, but it weighs more than two pounds. We imagine if that was pinning the ten-legged animals (Decaphoda) weighing two kilograms. Resulting in profuse bleeding and limbs we will compress up to meet death.
According to data from the U.S. Department of Health, in Antarctica each year 3,000 people out of 100,000 hunters killed king crab, the rest suffered injuries or physical disabilities. Uniquely, this event continues to repeat itself, because it can be a king crab special menu and expensive. Accidents can occur due to sandwiched king crab or Japanese spider crab, which stretch his legs just four meters.
The ecologist said, it looks like now ecological changes happen in the Antarctic region. This is due to rising water temperatures due to global warming. Impact, king crab back into the area around the South Pole, which is not explored for 15 million years. Crab king crab is a kind of "giant" who live in the waters near the poles. Weighs up to one kilogram more and can be processed so a typical meal with a special scent. According to records, the spread of kingcrab family exists only on the South Pole and North Pole. However, it is said in Papua also of this type, which weighs almost two pounds more.
The shift of tectonic plates in the southern continent of Antarctica causes the formation of a pattern of very cold polar currents around the continent. As a result, water temperatures near zero degrees Celsius, so that predators such as king crab body could no longer live there because the physiology of his body no longer able to withstand freezing temperatures. Finally, king crabs move into the deep ocean, below 1,500 meters where the temperature remained around two degrees Celsius. However, lately, the temperature of sea water around the shallower Atlantic rose by close to one degree Celsius due to global warming. At a temperature of one degree Celsius, king crab is still able to survive.
British researchers, from the research vessel James Clark Ross, conduct special observations using an underwater robot named Isis. Robots are controlled remotely to observe the shift plate Antarctic continent is able to record the presence of king crab at a depth of 1,100 meters on 25 January. A king crab diameter of 50 centimeters seen crawling on the basis of rock near Antarctica.
From the ship Dave Turner, a technician from the National Oceanography Centre University Shouthampton (NOCS), deftly controlling the robotic arm of Isis to catch crabs and put it into a sample bag. DNA was examined and compared with DNA crabs from other areas to unknown origin. "If this is the beginning of the invasion, subsequent to the initial changes in the Antarctic Peninsula community, and change the ecosystem," said Sven Thatje, a marine ecologist from the NOCS.
Since a king crab caught in there, 22 researchers on board took turns every four hours observing the Antarctic continent plates to look for other crabs. However, until the expedition ends on February 6, did not found any other crabs.
Looking for crabs under the sea is not an easy task because it requires special equipment. But in Antarctica, the crabs do not live in coastal waters during the last 40 million years, because the temperature is too cold.
Changes in water temperature has been lowered physiological barrier facing the development of crabs. These animals are unable to process magnesium in their blood below a certain temperature and the result is narkobis effect on crab movement. Magnesium is a mineral that is absorbed from the surrounding sea water. Scientists said the barrier would soon be eliminated, such as global climate change continues to impact on wildlife in the polar regions.
Crab international team of researchers will spend the next few months analyzing the 120,000 images taken from the seabed by the AUV, designed and operated by Woods Hole Oceanographic Institution. They want to know whether the crab will attack and leave permanent or browse the shallow areas. The presence of colonies they destroy the structure of society who have been there before or maybe change it?
Cruise ship previously saw only one or two crabs, but now scientists can see the entire population, as well as the appearance of crabs on Christmas Island. According to Rich Aronson, principal investigator in the project crabs and a professor of biology at Florida Institute of Technology, crabs move from the deep sea, to the continental slope to the shallow shelf areas.
Red crabs on Christmas Island Burrows regional Australia is a type of crab endemic to the Indian Ocean region. Each year, entered the October-December, the red crab migration will be massive. Over land, then go to the beach to find a place to lay eggs. Commercial harvesting is done in a very short season, and crops were shipped across the world. Many of the king crab caught in Russian waters and international waters. The most popular months are catching crabs in October and January.
Season for every type of crab can be very short or long depending on water temperature. Harvest seasons for red king crab is now an average of four days, after declining several times in previous years. In the winter of 2005-2006, about 250 fishing boats caught 14 million pounds (about 7 million kilograms) of red king crab in four days. In the United States, Alaska king crab fishing is the most dangerous job .*** [DEDI RISKOMAR | PIKIRAN RAKYAT 17032011]
