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The nursehound (Scyliorhinus stellaris), also known as the greater spotted dogfish, bull huss, or large-spotted dogfish, is a catshark species in the Scyliorhinidae family. It is an oviparous species. After reproduction, the egg takes up to nine months to hatch commonly. It may be found at a depth ranging from 147-1300 ft (44.8-396.2 m) in the northern Atlantic Ocean amid rocks or algae. The most common depth is between 66 ft (20.1 m) and 197–410 ft (60-125 m). They are a large species of catshark, although they are less frequent in their area. You might want to take a look at our hogfish and kelpfish facts.
The Scyliorhinus stellaris is a shark found at depth of 66 ft (20.1 m) and 197–410 ft (60–125 m).
Thee Scyliorhinus stellaris is a mammal.
It has been classified as Near Threatened by the International Union for Conservation of Nature since the population in the Mediterranean Sea appears to have decreased significantly due to overfishing.
The nursehound habitat (Bull huss) is generally found from southern Scandinavia to the Mediterranean, Morocco, the Canary Islands, Mauritania, and Senegal in the northeast Atlantic. There are records further south, to the Gulf of Guinea and the mouth of the Congo River, although these are most likely observations of the West African catshark. It appears to have a spotty distribution across the island chains. Its distribution overlaps with that of the more common and closely related Smallspotted catsharks (has larger spots than it). The River Fal estuary and Wembury Bay in England, generally rough coastal locations throughout the Italian Peninsula, particularly the Santa Croce Bank in the Gulf of Naples, are known nesting grounds. In the spring or early summer, adults go to shallow water and mate solely at night.
Bull huss (Scyliorhinus stellaris) are classified as benthic subtropical. The nursehound's distribution is commonly along the seafloor, in rocky regions with plenty of algae. They hunt at night, consuming cephalopods (such as squid and octopus), crustaceans (such as crabs and large shrimp), smaller fish, and even other sharks. During the day, they hide in rock holes and crevices, with many sharks occasionally resting in the same nook.
Nursehounds are nocturnal, spending hidden in holes during the day, frequently in small groups. Some have even been observed cramming themselves into the same tiny slot. At night, it may swim into deeper water to hunt. It's also a well-known scavenger. In captivity, nursehounds are social and prefer to relax in groups, however, the members of any given group vary often.
The nursehound (bull huss) has a lifespan of 19 years length.
The nursehound is oviparous, with one egg in each oviduct. In the spring and summer (March to October), they deposit their eggs. They lay large, thick-walled nursehound egg cases with powerful tendrils at the edges that grasp algae or seaweed. They can hatch in as little as seven months and as many as 12 months; eggs in the North Sea and Atlantic require 10–12 months to hatch, while those in the southern Mediterranean take seven months. Despite the fact that a single female generates 77–109 oocytes every year, not all of them are ovulated, and estimates of the actual number of thick eggs deposited range from 9-41.
The monogeneans Hexabothrium appendiculatum and Leptocotyle major, the tapeworm Acanthobothrium coronatum, the trypanosome Trypanosoma scyllii, the isopod Ceratothoa oxyrrhynchaena, and the copepod Lernaeopoda galei are known Bull huss parasites.
Their status is Near Threatened. They are less frequent across their rocky range, and their numbers in the Mediterranean have fallen due to exploitation. Nursehounds are considered food in certain European nations under various names such as flake, catfish, rock eel, and rock salmon. It was previously prized for its rough skin (known as 'rub skin'), which was used as an abrasive. Rub skin was once so valuable, that 1 lb (453.6 g) of it was worth the equivalent of a hundredweight of sandpaper. The liver was also utilized as an oil source, and the corpses were chopped up and used as bait for crab traps. The nursehound's fins are occasionally dried and sold to the Asian market, or it is turned into fishmeal. All these factors reduce its lifespan. There is evidence that its population has dropped considerably in the Gulf of Lion, off the coast of Albania, and in the rocky Balearic Islands. Its populations in the upper Tyrrhenian Sea have decreased by more than 99 % since the 1970s. Many public aquariums have nursehounds on exhibit, and they have been reared in captivity.
The nursehound is a strong, large, stalky creature with many tiny and large black spots and, sometimes, white patches all over a pale grayish or brownish background. The saddles are either very weak or completely missing. The big patches can be uneven and occasionally grow into enormous blotches that cover the entire body length. The ventral side is a light white color. The five pairs of gill openings are tiny, with the final two extending over the bases of the pectoral fins. The two dorsal fins are located in the rear of the body. The first dorsal fin is bigger than the second and originates above the pelvic fin bases. The pectoral fins are enormous. They have tiny nasal flaps that do not extend to their mouth.
Anyone who has heard the popular 'Baby Shark' song would agree that these aquatic animals are a fascinating and thrilling subject for both children and adults. These beautiful animals are a matter of surprise due to their sleek body length and sharp features with white markings down their flanks, even though they are fierce and savage in nature.
Sharks can't produce any sounds, therefore they communicate through related body language. When two sharks 'speak' to one other, they may open their mouth, nod their heads, and arch their bodies along the length. When two sharks are pursuing the same prey, they will slap each other to dissuade the other. Their reproduction is oviparous.
Each egg case is 3.9-5.1 in (10-13 cm) in length. Hatchlings have reached a height of around 6.3 in (16 cm). It is usual for them to grow to 4.1 ft (1.25 m), with a maximum recorded at 5.3 ft (1.6 m). Newly hatched nursehounds develop at a rate of 0.01-0.02 in (0.45–0.56 mm) per day and have pronounced saddle marks. Sexual maturity is reached at a length of 2.5-2.6 ft (0.7–79 m), which corresponds to the age of four years assuming hatchling growth rates stay unchanged. Their egg cases are larger than Small spotted catshark purses. It has several big patches all over its body, as well as nasal flaps.
Instead of swimming, they sometimes 'walk' across the bottom with their pectoral fins. Nurse sharks are less prone to wanderlust, as many of them stay in the same geographical region all year. However, some of them may succumb to the travel bug from time to time, making the shark 'partially migratory.' That is, some members of this species migrate while others do not.
They can weigh up to 22 lb (10 kg).
The presence of external reproduction organs, known as claspers, is the greatest way to identify between adult male and female sharks. Those with claspers are adult males, whereas those without are either females or immature males. There is no sex-specific name given to them.
Pups are the name given to baby sharks. Sharks do not care for their young after birth, although they do look for a safe spot to deposit their eggs or give birth.
Crustaceans (crabs, hermit crabs, and large shrimp), cephalopods, other mollusks, bony fish, and even other tiny sharks such as the smallspotted catshark are common in the diet of the nursehound. Mackerel, deep-water cardinalfishes, dragonets, gurnards, flatfishes, and herring are examples of bony fish. Crustaceans are consumed in greater quantities by juveniles.
The Nassarius reticulatus, the netted dog whelk, preys on nursehound eggs by piercing the casing and removing what is inside. Nursehounds can sometimes be sold on the menu in many European nations under various names such as rock eel, catfish, flake, and rock salmon.
They pose little harm to people, but if you go too near and annoy them, their fangs may do some injury.
As they are a Near Threatened species, it is probably not a good idea to keep them as a pet.
Nursehounds deposit their eggs in the midst of seaweed. Curly tendrils on the egg cases wrap around the seaweed to keep the egg case from drifting away.
The popular name 'nursehound' derives from an old English fishermen's idea that this shark looks for its smaller cousins, but the term 'huss' may derive from a linguistic distortion of the word 'nurse' through time. The nursehound is also known as the greater-spotted catshark, bull huss, greater-spotted dogfish, and rough hound shark. Carl Linnaeus provided the first scientific description of the nursehound in the 10th edition of Systema Naturae in 1758. He named it Squalus stellaris, with the specific epithet Stellaris meaning 'starry.'
There are 22–27 tooth rows on each side of the upper jaw, with zero to two teeth at the symphysis. There are 18–21 tooth rows on each side of the lower jaw and two to four teeth at the symphysis. The teeth are smooth-edged and Y-shaped. The front teeth have a single central cusp, whereas the posterior teeth have two lateral cusplets. The teeth get increasingly smaller and more inclined towards the back of the jaws, with correspondingly bigger lateral cusplets. On the top rows, the teeth are narrow, with one exceptionally long, pointed straight center cusp and two very small, practically non-visible surrounding cusplets, and on the bottom rows, a single cusp.
Here at Kidadl, we have carefully created lots of interesting family-friendly animal facts for everyone to discover! For more relatable content, check out these giant frogfish facts and giant guitarfish facts for kids.
You can even occupy yourself at home by coloring in one of our free printable Nursehound coloring pages.
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