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Gulper sharks can have long resting periods between pregnancies. [2] They are ovoviviparous, meaning the only parental care they give their young is during the incubation period. [5] Since not all oocytes form into pups, when a pup or two is formed inside the female, they eat the remaining fertilized eggs, known as oophagy. [2]
These sharks eat mostly teleost fishes (particularly myctophids), cephalopods and crustaceans. [6] Females produce a maximum of one to two pups every one to two years. Newborn pups range in size from 35 cm to 40 cm. Evidence suggests that the left-side uterus is less functional than the right-side. [7] They can live up to 46 years on average.
The legend says that an old woman washed her hair in urine (a common practice to kill head lice) and dried it with a cloth. The cloth blew into the ocean to become Skalugsuak. [63] Another legend tells of Sedna, whose father cut off her fingers while drowning her, with each finger turning into a sea creature, including Skalugsuak. [64]
One of the few sharks to exhibit parental care, female horn sharks in the wild pick up their eggs in their mouths and wedge them into crevices. [3] However, in captivity the eggs are simply dropped on the bottom and may later be cannibalized. [2] The eggs hatch in 6–10 months; at emergence the young measure 15–17 cm (5.9–6.7 in) long. [1]
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Thresher sharks are solitary creatures that keep to themselves. It is known that thresher populations of the Indian Ocean are separated by depth and space according to sex. Some species however do occasionally hunt in a group of two or three contrary to their solitary nature. All species are noted for their highly migratory or oceanodromous habits.