Pacific sleeper sharks, which are thought to be both predators and scavengers, can glide through the water with … See more

Very little is known about the early life of Pacific sleeper sharks. They are believed to produce eggs that hatch inside the female's body (reproduction is ovoviviparous), but gestation time is unknown and litter sizes are though… See more

The average mature size is 3.65 m (12.0 ft) and 318–363 kg (701–800 lb). The largest Pacific sleeper shark verified in size measured 4.4 m (14 ft) long and weighed 888 kg (1,958 lb), although it could possibly reach 7 m (… See more

Due to living in frigid depths, the sleeper shark's liver oil does not contain squalene, which would solidify into a dense, nonbuoyant mass. Instead, the low-density compounds in the sharks' liver are diacylglyce… See more

Sleeper sharks are preyed on by the offshore ecotype of killer whale off British Columbia. In addition, like the Greenland shark, the parasitic copepod Ommatokoita elongata can often be observed consuming the shark's … See more

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