How do you fish stay warm at the bottom of ocean?

Fish are ectothermic, meaning that they rely on their environment to regulate their body temperature. Fish that live in the deep sea have evolved a number of adaptations to help them survive the cold temperatures, such as:

* A thick layer of body fat: Body fat helps to insulate fish and keep them warm.

* A slow metabolism: Fish that live in the deep sea have a slow metabolism, which helps to conserve energy.

* An ability to produce antifreeze proteins: Some deep-sea fish produce antifreeze proteins that prevent ice crystals from forming in their body fluids.

* A lack of gills: Some deep-sea fish do not have gills, and instead rely on their skin to absorb oxygen from the water. This helps to reduce heat loss through the gills.