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Sharks have keen olfactory senses, located in the short duct which is not fused, unlike bony fish between the anterior and posterior nasal openings, with some species able to detect as little as one part per million of blood in seawater. They are more attracted to the chemicals found in the intestines of many species, and as a result often linger near or in sewage outfalls.
Some species, such as nurse sharkshave external barbels that greatly increase their ability to sense prey. Sight Eye of a Bigeyed sixgill shark Hexanchus nakamurai Shark eyes are similar to the eyes of other vertebratesincluding similar lensescorneas and retinasthough their eyesight is well adapted to the marine environment with the help of a tissue called tapetum lucidum. This tissue is behind the retina and reflects light back to it, thereby increasing visibility in the dark waters.
The effectiveness of the tissue varies, with some sharks having stronger nocturnal adaptations. Many sharks can contract and dilate their pupilslike humans, something no teleost fish can do. Sharks have eyelids, but they do not blink because the surrounding water cleans their eyes. To protect their eyes some species have nictitating membranes. This membrane covers the eyes while hunting and when the shark is being attacked.
However, some species, including the great white shark Carcharodon carchariasdo not have this membrane, but instead roll their eyes backwards to protect them when striking prey.
The importance of sight in shark hunting behavior is debated. Some believe that electro- and chemoreception are more significant, while others point to the nictating membrane as evidence that sight is important.
Presumably, the shark would not protect its eyes were they unimportant. The use of sight probably varies with species and water conditions. The shark's field of vision can swap between monocular and stereoscopic at any time. The remaining seven species had in addition to rods a single type of cone photoreceptor sensitive to green and, seeing only in shades of grey and green, are believed to be effectively colorblind. The study indicates that an object's contrast against the background, rather than colour, may be more important for object detection.
The lateral line shows a similar arrangement, and is open to the environment via a series of openings called lateral line pores. This is a reminder of the common origin of these two vibration- and sound-detecting organs that are grouped together as the acoustico-lateralis system. In bony fish and tetrapods the external opening into the inner ear has been lost.
Electromagnetic field receptors ampullae of Lorenzini and motion detecting canals in the head of a shark Electroreception Main article: Electroreception The ampullae of Lorenzini are the electroreceptor organs. They number in the hundreds to thousands. Sharks use the ampullae of Lorenzini to detect the electromagnetic fields that all living things produce. The shark has the greatest electrical sensitivity of any animal. Sharks find prey hidden in sand by detecting the electric fields they produce.
Ocean currents moving in the magnetic field of the Earth also generate electric fields that sharks can use for orientation and possibly navigation. Lateral line This system is found in most fish, including sharks. It detects motion or vibrations in water. Most live 20 to 30 years.
The spiny dogfish has one of the longest lifespans at more than years. Fecundity in sharks ranges from 2 to over young per reproductive cycle.
For example, lemon sharks reach sexual maturity at around age 13— In less flexible species the two sharks swim parallel to each other while the male inserts a clasper into the female's oviduct. Females in many of the larger species have bite marks that appear to be a result of a male grasping them to maintain position during mating.
The bite marks may also come from courtship behavior: In some species, females have evolved thicker skin to withstand these bites. The extent of this behavior in the wild is unknown. Mammals are now the only major vertebrate group in which asexual reproduction has not been observed. Scientists say that asexual reproduction in the wild is rare, and probably a last-ditch effort to reproduce when a mate is not present.
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Asexual reproduction diminishes genetic diversitywhich helps build defenses against threats to the species. Species that rely solely on it risk extinction. Asexual reproduction may have contributed to the blue shark 's decline off the Irish coast. The young continue to be nourished by the remnants of the yolk and the oviduct's fluids.
As in viviparity, the young are born alive and fully functional. Lamniforme sharks practice oophagywhere the first embryos to hatch eat the remaining eggs.
Taking this a step further, sand tiger shark pups cannibalistically consume neighboring embryos. The survival strategy for ovoviviparous species is to brood the young to a comparatively large size before birth. The whale shark is now classified as ovoviviparous rather than oviparous, because extrauterine eggs are now thought to have been aborted.
Most ovoviviparous sharks give birth in sheltered areas, including bays, river mouths and shallow reefs. They choose such areas for protection from predators mainly other sharks and the abundance of food. Dogfish have the longest known gestation period of any shark, at 18 to 24 months. Basking sharks and frilled sharks appear to have even longer gestation periods, but accurate data are lacking. In most oviparous shark species, an egg case with the consistency of leather protects the developing embryo s.
These cases may be corkscrewed into crevices for protection. The egg case is commonly called a mermaid's purse. Oviparous sharks include the horn sharkcatsharkPort Jackson sharkand swellshark. However, this applies to only a few species. Most live far more social, sedentary, benthic lives, and appear likely to have their own distinct personalities.
Sharks can be highly social, remaining in large schools. Sometimes more than scalloped hammerheads congregate around seamounts and islands, e. For example, oceanic whitetip sharks dominate silky sharks of comparable size during feeding.The Truth About the Titanic Has Been Revealed
This usually consists of exaggerated swimming movements, and can vary in intensity according to the threat level. These exceptions may be due to the warm-bloodedor homeothermicnature of these sharks' physiology.