Here's why hibernation is not necessary for them:
* No need for energy conservation: Hibernation is a strategy for animals living in environments with seasonal changes in food availability and temperature. Viperfish live in the deep ocean, where resources are relatively stable.
* Constant food supply: While deep-sea environments have fewer organisms compared to the surface, viperfish are adapted to prey on small fish and crustaceans that are available year-round.
* Cold water environment: The deep ocean is consistently cold, eliminating the need for a period of dormancy to survive extreme temperatures.
Therefore, viperfish, like most deep-sea creatures, don't need to hibernate because their environment doesn't necessitate it.