September 3, 2020
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Then the male inserts a clasper in her vent, and then rolls on his back beside the female. [4], The Nurse shark is one of the few species of sharks that can remain motionless in the water when it wants to. The typical lifespan of the Nurse Shark is 15-25 years. A more detailed description, along with an illustration, was published by German naturalist Eduard Rüppell in 1837 as Nebrius concolor, based on a specimen from the Red Sea. Unlike in mackerel sharks, the eggs consumed by the embryos are large and shelled rather than small and undeveloped. Nurse sharks, Ginglymostoma cirratum (Bonnaterre, 1788), reach a maximum of 4.3 m total length; maximum weight is 110 kg. Large juveniles and adults are usually found around deep coral reefs, and rocky areas at depths of up to 3-75 metres (10-246 feet) during the daytime, and then they migrate into shallower waters of less than 20 metres (66 feet) deep after darkness. Off Queensland, Australia, the tawny nurse shark is valued by big-game anglers. This anomalous individual is the largest albino shark known to date, having survived for a long time in the wild despite its lack of camouflage. Nebrius concolor Rüppell, 1837 There are a pair of long, slender barbels in front of the nostrils. Also, there have been reports of Bull sharks, and Great white sharks feeding on Nurse sharks. Adult Nurse sharks are usually light yellow to dark brown in colour. Newly born nurse sharks have a spotted coloration which fades with age and are about 30 cm in length when nascent. If disturbed the bite is powerful and capable of inflicting serious injury. Ginglymostoma rueppellii Bleeker, 1852 However, some unprovoked attacks on swimmers and divers have been reported. [2], The tawny nurse shark has few natural predators; attacks on this species have been reported from bull sharks (Carcharhinus leucas) and great hammerheads (Sphyrna mokarran), while the related nurse shark has been known to fall prey to tiger sharks (Galeocerdo cuvier) and lemon sharks (Negaprion brevirostris). The litter size may be as small as one or two, based on the large size of near-term embryos. In the central Pacific, it has been reported from off New Caledonia, Samoa, Palau, the Marshall Islands, and Tahiti. It is also esteemed as a game fish off Queensland, Australia, and is known for its habit of spitting water in the faces of its captors. The first dorsal fin is located over the pelvic fins. [1], The Nurse shark is common in the coastal tropical and subtropical waters of the eastern Pacific and the Atlantic Ocean. During the day, groups of two dozen or more sharks can be found resting inside caves and under ledges, often stacked atop one another. Scymnus porosus Ehrenberg, 1871. It is aplacental viviparous, meaning the embryos hatch from egg capsules inside the mother. The caudal fin has a shallow upper lobe and barely present lower lobe, comprising about a quarter of the total length in adults. This shark is caught using demersal trawls, floating and fixed bottom gill nets, and on hook-and-line. Since 1998, The MarineBio Conservation Society has been a nonprofit volunteer marine conservation and science education group working online together to educate the world about ocean life, marine biology, marine conservation, and a sea ethic. [2], The genus name Nebrius is derived from the Greek word nebris or nebridos, meaning the skin of a fawn. [9] The tawny nurse shark is the only carpet shark in which there is oophagy: once the developing embryos exhaust their supply of yolk, they gorge on eggs produced by the mother and acquire the distended abdomen characteristic of such oophagous embryos. The maximum recorded length of the tawny nurse shark is 3.2 m (10 ft). The young are born with spots, which fade as the sharks grow older. However, sometimes the larger pups will feed on the smaller pups. Scyllium ferrugineum Lesson, 1831 Males attain sexual maturity at a length of 2.5 m (8 ft 2 in), and females at a length of 2.3–2.9 m (7 ft 7 in–9 ft 6 in). The nurse sharks spend their days sleeping in cuddle piles. Studies show that Nurse sharks kept out of sunlight become slightly lighter in colour, as compared to Nurse sharks which are exposed to sunlight. Have you ever wondered how dolphins evolved to conquer the world’s oceans and rivers? [12], The tawny nurse shark is taken by commercial fisheries operating throughout its range, including off Pakistan, India, Thailand, and the Philippines; an exception is in Australian waters, where it is only taken in small numbers as bycatch. [2] An Australian woman was bitten while hand feeding them in 2018. Nurse sharks are nocturnal, and are very sluggish and are harmless unless bothered. Averaging 2.2-2.7 metres (7.2-9 feet) in total length, and weighing 75-105 kg (165-232 pounds), adult females reach a larger size than adult males which are around 2.1-2.6 metres (7-8.5 feet) long, and weigh around 90-120 kg (198-265 pounds). Active-Swimming predator that uses a powerful suction force to extract prey from inside holes and crevices in which they rested. Near-Term embryos its range for meat, fins, liver oil, leather, and is the carpet. Species may reach a Weight of 110 kg over them and smaller spiracles behind about 2.3 metres ( feet... Preying on octopus system based on respiratory pumping of water is made into leather products clasper in her vent and! ( 90 to 150 kg ) pelvic fins to Peru is especially important for bottom dwellers such nurse. Been known to repeatedly return to each day, sur la corvette la Coquille ft. ( 2.2 to 3 ). 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