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Nursehound
The nursehound (''Scyliorhinus stellaris''), also known as the large-spotted dogfish, greater spotted dogfish, or bull huss, is a species of catshark, belonging to the family Scyliorhinidae, found in the northeastern Atlantic Ocean. It is generally found among rocks or algae at a depth of . Growing up to long, the nursehound has a robust body with a broad, rounded head and two dorsal fins placed far back. It shares its range with the more common and closely related small-spotted catshark (''S. canicula''), which it resembles in appearance but can be distinguished from, in having larger spots and nasal skin flaps that do not extend to the mouth.
Nursehounds have nocturnal habits and generally hide inside small holes during the day, often associating with other members of its species. A benthic predator, it feeds on a range of bony fishes, smaller sharks, crustaceans, and cephalopods. Like other catsharks, the nursehound is oviparous in reproduction. Females deposit large, thick-walled egg cases, two at a time, from March to October, securing them to bunches of seaweed. The eggs take 7–12 months to hatch. Nursehounds are marketed as food in several European countries under various names, including "flake", "catfish", "rock eel", and "rock salmon". It was once also valued for its rough skin (called "rubskin"), which was used as an abrasive. The International Union for Conservation of Nature (IUCN) has assessed the nursehound as Near Threatened, as its population in the Mediterranean Sea seems to have declined substantially from overfishing.
==Taxonomy==
The first scientific description of the nursehound was published by Carl Linnaeus, in the 1758 tenth edition of ''Systema Naturae''. He gave it the name ''Squalus stellaris'', the specific epithet ''stellaris'' being Latin for "starry". No type specimen was designated. In 1973, Stewart Springer moved this species to the genus ''Scyliorhinus''.〔(''Squalus stellaris'' ). (2007). ''Catalog of Fishes''. California Academy of Sciences. Retrieved on July 24, 2009.〕 The common name "nursehound" came from an old belief by English fishermen that this shark attends to its smaller relatives, while the name "huss" may have come from a distortion of the word "nurse" over time.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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