Nurse sharks are also known to graze algae and coral. Some species of shark are known for migrating behavior that takes place as ocean currents shift and the waters the sharks inhabit become cooler.
Despite their size most nurse sharks are recognized as being harmless to humans but with such large tooth filled jaws these sharks can cause a significant amount of damage if they do bite a human. A nurse shark’s mouth is filled with rows … [4] Common in shallow, tropical and subtropical waters, these sharks are sluggish and docile bottom-dwellers. 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 and eastern Atlantic Ocean. It is not uncommon to see cannibalistic behavior in the nurse shark even in the womb as the stronger of the pups vie to compete for food against other siblings. Watch this minute and a half video to see the nurse sharks in action. Crabs, shrimps of all kinds, and lobsters are taken whole from under the reef. Unlike migrating shark species however, the nurse shark copes with dips in water temperature in a different way. The serrated teeth are fan-shaped and independent; like other sharks, the teeth are continually replaced throughout the animal's life. Nebrius It may come from the strange sucking sounds they make when searching for prey in the sand. Nurse sharks are ovoviviparous, producing young by means of eggs that are hatched within the body of the pregnant female. The largest species, called simply the nurse shark Ginglymostoma cirratum, may reach a length of 4.3 m (14 ft); the tawny nurse shark Nebrius ferrugineus is somewhat smaller at 3.2 m (10 ft), and the short-tail nurse shark Pseudoginglymostoma brevicaudatum is by far the smallest at just 75 cm (2.46 ft) in length. The ability of this shark species to endure captivity has led to the sale of juvenile nurse sharks in the saltwater aquarium trade. The usual mating season for the nurse shark is from the end of June to the end of July and the gestation process takes approximately six months in order for the nurse shark pups to develop fully. The range of nurse sharks in the Atlantic Ocean extends from Rhode Island to southern Brazil, including the entire Caribbean and Gulf of Mexico. The term “nurse” probably derived from “Nusse”, the common name originally applied to catsharks of the family Scyliorhinidae, to which G.cirratum was originally thought to belong.
There are three genera of sharks to be found within the Ginglymostomatidae family, the Ginglymostoma, Nebrius and Psudoginglymostoma. But they do slow down, swim locally, and associate — sometimes in cozy piles — with other similar-sized nurse sharks in the shallow warm seas they usually inhabit. Algae and corals are occasionally found in their stomachs, as well. The time to reach adulthood and mating can be as long as 15 to 20 years, at which time they are 7 to 7.5 feet in total length.
The scientific name Ginglymostoma cirratum is is a mix of Greek and Latin and means "curled, hinged mouth" to describe this shark's somewhat puckered appearance. Ginglymostomatidae sharks are found most commonly in tropical and subtropical waters due to their preference for warmer waters, and more often than not they are found in shallower areas of the ocean. A newborn nurse shark measures in at approximately 12 inches long. Description. The nurse shark is a nocturnal predator that feeds mainly on fish, stingrays, mollusks (octopi, squids and clams) and crustaceans. The flesh of sharks and other long-lived fish species concentrates mercury and other toxins and should be avoided. When it comes to feeding, the nurse shark is limited by the size of its mouth and as such it cannot take in large prey items due to the risk of them becoming lodged in the mouth. Skin of a nurse shark (Ginglymostom cirratum) showing the rough placoid scales, commonly called denticles. The mouth is bracketed by two sensory barbels. Shark Mouth Face Mask, Reusable, Washable, and Adjustable Animal Face Mask with Nose Wire, Filter Pocket, and 2 Filters, for Adults and Kids ArtlyMasks. The small mouth limits the size of the prey that's available to the nurse shark, and the teeth are barely used in feeding because of the shark's ability to draw food in with the pharynx.
The dorsal fins of the nurse shark are nowhere near as large as the tail fins but the two dorsal fins that can be seen on the back of the shark are approximately the same size.
Unlike some other oceanic creatures, the nurse shark is able to remain stationary and continue to breathe underwater by sucking water in through the mouth and releasing it out of their gills. [3] They are robust and able to tolerate capture, handling, and tagging extremely well.
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