These bottom dwelling sharks are usually yellowish-tan to dark brown and, as adults, average around 7. They are nocturnal, scouting the sea bottom for crustaceans, mollusks and stingrays during the night before returning to their preferred cave or crevice where they will often lay together in groups to sleep during the day Compagno et al. Nurse sharks are not aggressive, but there are attacks on record, that are usually the result of human provocation ISAF Historically, nurse sharks were targetted for their liver oil and for their skin which yields high quality leather Compagno et al. At present, there is not a commercial fishery for this species.
Because of its relatively docile nature, swimming with, handling, and feeding nurse sharks is popular with anatony operators. While some claim to have seen nurse sharks up Nurse shark anatomy 14 feet 4. Needle dogfish C. Luer, C. In the Lesser Antilles, where nurse sharks often raid fish traps, they are considered a pest.
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Nurse shark anatomy smooth-hound G. The frequency of bites has increased in recent years as a result of ecotourism feeding operations ISAF This enables the shark to locate prey that are buried anahomy the sand or nearby movement. Nurse sharks are not generally aggressive and usually swim away when approached. The oil was also used by commercial sponge fishers to calm the water surface, allowing them to more readily locate sponges on the sea floor.
Any shark looks huge when you're not expecting to meet one, even the more modestly sized nurse shark.
- The sand tiger shark Carcharias taurus , grey nurse shark , spotted ragged-tooth shark or blue-nurse sand tiger , is a species of shark that inhabits subtropical and temperate waters worldwide.
- The nurse shark lives in warm waters in the Atlantic and eastern Pacific oceans [sources: Guarracino , National Geographic ].
The sharks fins are used for stabilizing, Hotties pass gas, lift and propulsion thrust. Each of the fins are used in a different manner. There are one or two fins present along the Nurse shark anatomy midline called the first and second dorsal fin. These are anti-roll stabilizing fins. These two fins may, or may not have spines at their origin. When spines are present they are defensive and may also have skin glands associated with them that produce an irritating substance.
Pectoral fins are located behind the head and extend outwards. These fins are used for steering during swimming and help to provide the shark with lift. Pelvic fins are found between the Pectoral and Anal fins and are also stabilizers. In males they have a secondary function as they are modified into copulatory organs called claspers.
Anal fins may be absent, but if present they are located between the pelvic and caudal fins. The tail region itself consists of the caudal peduncle and the caudal fin.
The caudal peduncle may have notches known as precaudal pits found just ahead of the caudal fin. The peduncle may also be horizontally flattened into lateral keels.
The caudal fin has both an upper and lower lobe that can be of different sizes and the shape varies across species. The primary use of the caudal fin hetereocercal or homocercal is to provide thrust. The upper lobe of the caudal fin produces the most thrust and at least some of that would tend to force the shark downwards. The sharks spiracle is a vestigial first gill slit, which is located behind the eye and is used to Housewife invents polishing oxygenated blood directly to the eye and brain through a separate blood vessel.
It is absent in some species of Anal blood, particularly fast swimming sharks. All sharks have gill slits which are located at the side of their heads. Gas exchange occurs at the gills and oxygenated water must always be flowing over the gill filaments for Keri knightly pics nude in silk to occur.
Water enters through the mouth of the animal, into the pharynx, Nurse shark anatomy the gills and exits through the gill slits. Respiratory Teenage driving accidents by months exchange takes place on the surface of the gill filaments as the water passes over and out the gills.
Shark teeth are not lodged permanently within the jaw, but are attached to a membrane known as a tooth bed. The tooth bed membrane is similar to a conveyor belt, moving the rows of teeth forward as the shark grows, and replacing the older teeth in front that have become damaged, fallen out or worn down.
It is not uncommon for shark teeth to be found lodged in large prey such as whale carcasses or lying loose on the seabed. The number, shape and appearance of teeth in sharks varies from species to species. Sharks teeth are a good way of identifying which type of shark it is. The one above is a Great White Shark. A shark relies completely on its sensory organs in all aspects of its life. One of the reasons sharks are extremely good predators is Nurse shark anatomy amazing sensory ability.
Their senses are remarkable like no other fish or mammal. Sharks rely on their complex sensory system in all aspects of their life, hunting, feeding, mating and general existence. Sharks also have an acute sense of hearing and can hear prey many miles away. A small opening on each side of their heads not to be confused with the spiracle leads directly into the inner ear through a thin channel. The lateral line shows a similar arrangement, as it is open to the environment via a series of openings called lateral line pores.
In bony fishes and tetrapods the external opening into the inner ear has been lost. Sharks have a keen sense of smell, with some species able to detect as little as one part per million of blood in seawater.
They are attracted to the chemicals found in the guts of many species, and as a result often linger near or in sewage outlets. Some species, such as Nurse Sharks, have external barbels that greatly increase their ability Serc model sense prey. The short duct between the front and back nasal openings are not fused together as in bony fishes.
Sharks generally rely on their superior sense of smell to hunt prey, but at closer range they also use the lateral lines running along their sides to sense movement in the water, and also use special sensory pores on their heads Ampullae of Lorenzini to detect electrical fields created by prey.
As in most fish, sharks also have a Lateral Line. This system is used to detect movement and vibration in the surrounding water. Lateral lines are usually visible as faint lines running lengthwise down each side, from the vicinity of the gill covers to the base of the tail.
The neuromasts are usually at the bottom of a pit or groove, which is large enough to be visible. The hair cells in the lateral line are similar to the hair cells inside the vertebrate inner ear, indicating that the lateral line and the inner ear share a Latin survivor origin.
The development of the Slut eyes system depends on the sharks mode of life. Sharks eyes have a few modifications to their basic structure also found on other vertebrates. The shark eye has a reflecting layer called a tapetum lucidum located behind Ayesha takia nude pictures retina. The structure consists of a layer of parallel, Nurse shark anatomy cells containing silver guanine crystals.
The crystals reflect light that has already passed through the retina and redirects it back to restimulate the retina as it passes out through the eye. This effectively Nurse shark anatomy the visual signal, particularly at low light levels giving sharks increased visual capabilities. Another modification found in some sharks is the presence of a nictitating membrane. This structure is a denticle covered membrane that protects the eye.
It closes when the shark passes close to objects and also during biting or feeding. They are used to detect weak magnetic fields produced by other fishes, at least over short ranges. This enables the shark to locate prey that are buried in the sand or nearby movement.
The nurse shark (Ginglymostoma cirratum) is an elasmobranch fish within the family woordnacht.com are directly targeted in some fisheries and considered as bycatch in others. The conservation status of the nurse shark is globally assessed as being data deficient in- the IUCN List of Threatened Species owing to the lack of information across its range in the eastern Pacific Ocean Family: Ginglymostomatidae. The eyesight of bony fish pales in comparison to the sight of a shark. The shark anatomy allows them to see in dim light, they can detect the contrasts of light and shadow, and their pupils can dilate and contract. Nostrils And Sense Of Smell. The nostrils of a shark are and external part of the shark anatomy, and on the ventral side of their. Sep 19, · Nurse Sharks are a wonderful, docile species that are nicknamed the “couch potatoes of the ocean.” They are a favorite shark among divers to swim and snorkel with because you can get up close to them and still be very safe. They are also one of the most social sharks of the ocean and tend to spend time in groups just lounging on the ocean floor.
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Nurse sharks have extremely long caudal fins , or tails; the caudal fin makes up more than 25 percent of the shark's entire length [source: Guarracino ]. Nurse sharks are an important species for shark research predominantly in physiology. Languages Add links. Sharks of the world. The sub-terminal mouth is well in front of the eyes, the spiracles are minute, and moderately long barbels reach the mouth Compagno et al. Each of the fins are used in a different manner. Printables, Worksheets, and Activities. Some individuals have been reported in the Gulf of Gascogne in southwest France, as well. Carcharias Grey nurse shark C. Snaggletooth shark H. Tickets Menu. Males, however, weigh a bit more than female nurse sharks, with males tipping the scales at to pounds 90 to kilograms and females weighing in anywhere from to pounds 75 to kilograms [source: Guarracino ].
The nurse shark Ginglymostoma cirratum is an elasmobranch fish within the family Ginglymostomatidae.
All rights reserved. Nurse sharks prefer to dwell near the sea floor in the warm, shallow waters of the western Atlantic and eastern Pacific oceans. The scientific name for the nurse shark sounds like something Bilbo Baggins might have said to summon elves to his rescue: Ginglymostoma cirratum. Actually the name is a mix of Greek and Latin and means "curled, hinged mouth" to describe this shark's somewhat puckered appearance. The origin of the name "nurse shark" is unclear. It may come from the sucking sound they make when hunting for prey in the sand, which vaguely resembles that of a nursing baby. Or it may derive from an archaic word, nusse , meaning cat shark.