Sharks are a group (superordo Selachimorpha) fish with a complete cartilage skeleton and a slender body. They breathe using gills burrow five (sometimes six or seven, depending on the species) in addition to, or beginning slightly behind, his head. Sharks have skin-covered body dermal denticles to protect their skin from damage, from the parasite, and to increase the dynamics of water. They have several rows of teeth can be replaced.
Sharks can smell a drop of blood in the ocean up to a quarter mile away. Now, the mystery of exactly how the sharks use smell to find prey manakjubkan has been solved. The researchers have shown that the shark's nose using the "smell stereo" to detect - no more than half a second - from the time the smell to reach one's nostrils. A new study shows, when the hunters are experiencing delays, they will rotate to different directions to the smell first.
The findings are published in Current Biology - that helps solve one mystery of the old shark unsolved. University of South Florida scientists announced their findings after conducting laboratory tests on eight small sharks and a shark gray. Chief researcher Dr. Jayne Gardiner uses headgear consisting of two tubes of the shark in a tank containing 50 liters of seawater, and then presents a squid that has been marinated into each nostril alternately shark. He found that fish rested on a combination of directions - by the smell and the water flow for oriented and find what they seek.
If the delay between the scent reaching one nostril with one another - between a tenth and a half seconds, the shark would turn his head at the first time he smelled the squid. "If a shark experience delays or delay in detecting the scent lasts a long time - a second or so - they seem to only be turned to the left and right," said a spokeswoman for the scientists. "These results deny the common assumption that sharks and other animals to follow the scent molecules based on differences in concentrations of one nostril. Seems that the theory does not make sense when one considered his physical problems."
Dr. Gardiner says, "There is a very widespread opinion that the animal is used to detect the odor concentration.". "Most animals are equipped with two sensors of smell - the nose or antenna. As an example, and have long believed that they shared the concentration at each sensor and then turning toward the side receiving the strongest signal." . Olfactory organs in the nose several shark can detect one drop of blood in one million drops of sea water
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Excerpted from various sources
