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.
Pyjama catshark P. Shark Printouts to Color. This allows them to breathe without moving. In other ahark Wikimedia Commons Wikispecies. Floral banded wobbegong O. Conservation status. Regionally, Nurse sharks are still marketed for their fins, meat, and skin, particularly in Panama, Brazil, Venezuela, and the Caribbean.
Nude homocide pics. Nurse Shark
A study near Sydney in Australia found that the behaviour of the sharks is affected by Nursee proximity of scuba divers. Sharpfin houndshark T. Unlike other sharks, the sand tiger can gulp air Nurse shark size diagram the surface, allowing it to be suspended in the water column with minimal effort. The young Nutse born with spots but they will fade as they get older. This shark is a highly prized food item in the western northern Pacific, off Ghana and off India and Pakistan where they are caught by fishing trawlers, although they are more commonly caught with a fishing line. When you see them active Bathe chaucer portrait wife the day there Nurse shark size diagram threats around them or they are struggling to find enough food for survival. The dominant male snaps at smaller fish of other species. Polkadot catshark S. Female nurse sharks, averaging 7. Anal Fins For some sharks, these fins are not enough to completely stabilize them.
Nurse shark Print-out.
- The nurse shark is light yellowish-brown to dark brown, sometimes have small dark spots.
- Shark anatomy begins with the skin.
- It may come from the strange sucking sounds they make when searching for prey in the sand.
- Any shark looks huge when you're not expecting to meet one, even the more modestly sized nurse shark.
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. The most likely theory though is that the name comes from the Old English word for sea-floor shark: hurse.
Nurse sharks are slow-moving bottom-dwellers and are, for the most part, harmless to humans. They use their strong jaws to crush and eat shellfish and even coral, but prefer to dine on fish, shrimp, and squid. They are gray-brown and have distinctive tail fins that can be up to one-fourth their total length.
Unlike most other sharks, nurses are smooth to the touch. Nurse sharks are found in the warm, shallow waters of the western Atlantic and eastern Pacific oceans. They are abundant throughout their range and have no special conservation status, although the closeness of their habit to human activities is putting pressure on the species.
Read Caption. Nurse Shark. About the Nurse Shark The scientific name for the nurse shark sounds like something Bilbo Baggins might have said to summon elves to his rescue: Ginglymostoma cirratum. Continue Reading.
Cobbler wobbegong S. In the western Pacific, it has been sighted in the waters around the coasts of Japan and Australia, but not around New Zealand. Australian weasel shark H. Bramble shark E. Most sharks have five different types of fins, while some sharks only have four. New Caledonia catshark A. Megamouth shark M.
Nurse shark size diagram. External Shark Anatomy
Spiracles are mainly found on sharks that typically dwell near the seabed, otherwise known as sedentary sharks. The faster swimming sharks usually do not posses this feature, and if they do happen to have Spiracles , they are most likely small in size.
You many have noticed that the bodies of sharks are typically rounded and tapered at both ends. This type of shape causes them to have what is called a fusiform body. This body shape is exceedingly helpful because it minimizes drag, and it enables sharks to swim efficiently while using the least amount of energy possible. The coloration of sharks is enormously unique and important; not only is it yet another form of protection from their predators, but it also aids them when capturing prey.
The dorsal top side of a shark is a lighter color than the ventral bottom side. This coloration is a type of camouflage called counter shading. When viewed from above, the dark side of the shark blends in with the depths of the ocean. This enables sharks to slip past predators, and sneak-up on prey. Talk about convenience! If you were to look inside the body of a shark, you would notice many of the same organs that humans have. There is a huge difference between the human liver and the shark liver however.
The liver is usually the first thing one would notice when peering inside and seeing the shark anatomy. The liver is detrimental to the shark, and it has two purposes. Fatty reserves are kept in the liver, thus causing it to be a store of energy.
In addition, the liver actually keeps the shark from sinking. Due to this particular function, the liver is considered to be a hydrostatic organ. The shark anatomy includes an intestine that is used for digestion. When a shark needs to get rid of waste, it utilizes its kidneys, genitals, and cloaca.
The cloaca is an opening that the kidneys and genitals empty into. The skeleton of a shark is entirely composed up of cartilage. It is a bit alarming, but sharks do not have bones. The fact that sharks have cartilage instead of bone is extremely beneficial.
Cartilage is lighter than bone; this helps the shark stay afloat. Because cartilage is also extensively durable and flexible, sharks have the ability to have tight radius turns. The skull of a shark, which is also comprised of cartilage, can vary in shape. The mouth of a shark, one of its most recognizable features, is usually located on the ventral side. Sharks are constantly replacing their teeth; believe it or not, some sharks use more than 30, teeth over a life span.
When a new tooth grows, the skin maneuvers the tooth into a proper position. Although an extensive amount of information has not been found about sharks, we do know that they have taste buds. Some sharks spit things out after they have bit into them; this is most likely due to the fact that they did not like the particular taste.
Sharks have the reputation of devouring almost anything and anyone, but they are certainly pickier than many people realize. Without a doubt, sharks use more than their eyes and ears to track down prey. The lateral line is another sensory system that works simultaneously with the ampullae of Lorenzini. The lateral line is similar to ears because it detects low-frequency vibrations.
Vibrations from a distance can be detected easily by the lateral line, and the direction of water flow can also be determined by the lateral line. Because sharks use the sense sound to find their food, ears are needed in addition to the ampullae of Lorenzini and the lateral line.
Sharks have an inner ear that is used to pick up acceleration and gravity in addition to sound. Sharks have exceptional eyes that enable them to see acutely, even in low light. Behind their retina, is the tapetum lucidum; this is a layer that is comprised of silver guanine crystals that reflects light as it exits the eye.
This is the part of the shark anatomy that enables sharks to have the ability to see in low light. The eyelids of some sharks are certainly not typical. There are sharks that have what is called a nictating membrane. This feature provides a substantial amount of protection for the eye. When sharks get relatively close to a particular object, or when they are feeding, the nictating membrane closes, thus acting as a shield for the eye.
Some sharks, like the great white shark , actually have a set of muscles that roll the eye into its socket whenever the eye needs protection. The eyesight of bony fish pales in comparison to the sight of a shark. Female nurse sharks, averaging 7. Common in tropical and subtropical coastal waters on both sides of North America, nurse sharks often inhabit reefs and rest during the day on sandy bottoms or in caves and crevices.
They show a strong preference for certain resting sites, repeatedly returning to the same spot after their nocturnal forages. No species is known to regularly prey on nurse sharks, although they have been found in the stomach contents of lemon, tiger, bull and great hammerhead sharks. Subscribe to one or more National Aquarium newsletters to receive updates about animals, activities and more!
Search Close Search. Nurse Shark Ginglymostoma cirratum. George Grall, National Aquarium. National Aquarium.
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Shark Body Shapes - Shark Anatomy. Shark Graphing Activity. Sharks in the Classroom. Table of Contents. Enchanted Learning All About Sharks! Geologic Time Chart. Introduction to Sharks.
Introduction to Rays. Shark and Ray Species. Extreme Sharks. Extinct Sharks. Shark Glossary. Printables, Worksheets, and Activities. Male or Female? A scuba diver above a Whale shark. The Whale shark is the largest fish in the world; the basking shark is the second largest fish.
Graph Shark Sizes Graph shark sizes, for grades 2 and 3. Or go to a pdf of the activity. Sharks: Reading and Understanding Tables Use the table to answer the questions about sharks. Or go to the answers. Or go to a pdf of the quiz and the answers site members only.