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This shark is aplacental viviparous with oophagy, developing embryos being retained within the mother's uterus and subsisting on non-viable eggs. Only a few shark attacks of uncertain provenance have been attributed to the porbeagle.
It is well regarded as a game fish by recreational anglers.
The International Union for Conservation of Nature (IUCN) has assessed the porbeagle as Vulnerable worldwide, and as either Endangered or Critically Endangered in different parts of its northern range.
The Oxford English Dictionary states that the word was either borrowed from Cornish or formed from a Cornish first element with the English "beagle"; however, none of the proposed Cornish root words is fully satisfactory.
Most commonly found over food-rich banks on the outer continental shelf, it makes occasional forays both close to shore and into the open ocean to a depth of 1,360 m (4,460 ft).
It also conducts long-distance seasonal migrations, generally shifting between shallower and deeper water.
The meat and fins of the porbeagle are highly valued, which has led to a long history of intense human exploitation.
However, this species cannot sustain heavy fishing pressure due to its low reproductive capacity.
There are two stocks in the North Atlantic, east and west, that seldom mix; only one individual is known to have crossed the Atlantic, covering 4,260 km (2,650 mi) from Ireland to Canada.Bonnaterre named the shark Squalus nasus, the specific epithet nasus being Latin for "nose".Several phylogenetic studies, based on morphological characters and mitochondrial DNA sequences, have established the sister species relationship between the porbeagle and the salmon shark (L. When its two extant species diverged from each other is uncertain, though the precipitating event was likely the formation of the ice cap over the Arctic Ocean, which would have isolated sharks in the North Pacific from those in the North Atlantic.Fossilized porbeagle remains are known from Late Miocene epoch (c.7.2 Ma) deposits in Belgium and the Netherlands, Pliocene epoch (5.3–2.6 Ma) deposits in Belgium, Spain, and Chile, and Pleistocene epoch (2.6 Ma to 12,000 BP) deposits in the Netherlands.