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The odor of decaying meat based on the Grogol Aroma agent does not cause any unpleasant feelings to the wider public and is insensible in the outdoor conditions. However, sharks with their excellent sense of smell cannot stand it.

The sense of smell is the most important sense organ of sharks: there are good grounds for calling them "swimming noses". As researches show, a shark can recognize one part of the Grogol Aroma agent in million parts of water. If we refer to our common life, this can be compared to recognizing one teaspoon of the agent in a pool. Moreover, sharks identify the localized odor and take a decision on their movement, attack, retreat on the subconscious level. If blood attracts sharks and causes their aggression, the odor of decaying shark corpses repels them and make them change the direction of their movement to where there are more "pleasant" odors for the shark.

The pair of nostril channels with inner and outer openings lead to abdominal organs of smelling of a shark (i.e. those organs, which participate in the smelling process). The organs of smell are hidden bags, which are not connected to the mouth cavity. Water gets through the nostrils' openings, which are located on both sides of the shark's snout.

The Ampullae of Lorenzini constitute a complex and spacious sensor system in the predator's head. The outer openings cover the surface of shark's head, and each opening leads to channels filled with gel-like substance, which leads to membrane bags - the so-called ampullae. The walls of ampullae are covered with smelling receptors stimulated by nerve fibers.

The ampullae recognize electric fields in the short vibration range, as all living organisms produce electric fields. There is a hypothesis that due to these receptors sharks can recognize temperature, mechanical stimuli and magnetic fields. While moving, sharks react to any chemicals present in water. The uniqueness of the shark's receptors lies in the fact that some receptors react to one specific substance by catching small components on the electrochemical level and processing them with the brain, while other receptors can keep up sorting other substances. Such a sorting allows a shark not to be interrupted with other signals and to choose a preferable direction of movement or attack.

The shark's receptor system has many "preset" records, and the more the component structure of a recognized substance coincides with the chemical mixtures familiar to the shark, the more intensive signal for action is delivered to the shark's brain.

It is one thing to detect odors of chemical agents in water, but it is another to track down the source of the substances within a short time. On the subconscious level, a shark makes dodging movements from side to side trying to catch odors that come to it as precisely as possible, and as soon as the shark smells Grogol Aroma, it swims away from the source.

Another unique feature of the smelling device of sharks is its capability to react in different ways to substances with different nostrils. The channels full of receptors are capable to conserve the intensity of odor at different levels, and the shark will make its choice for that direction where there is no genetically unpleasant odor for it. Such strategy is more common for hammerhead sharks. In general, the shark's smelling apparatus function is analogous to an echo sounder. The difference is only in the fact that sharks filter signals by odors and electrochemical reactions rather than visually.

Researchers of sea fauna have noticed that the oceanic whitetip sharks have one distinctive attribute: they take their snouts out of the water to catch signals in the air. This hypothesis had been disputed and doubted until the Moscow Scientific Research Institution of Human Morphology proved by a research that the whitetip sharks indeed smell the aerial environment trying to catch attractive odors. These odors are conserved in air bubbles flying over water and keeping for a long time the information for sharks about their potential victims.

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