By eating (same as you).
The food they eat, just like you do.
They get their energy from the same place that all animals get their energy from: their food. [And it's "where do" not "where does". "Where does" is singular. "Where do" is plural.]
Ocelots give birth to baby ocelots.
what is the ocelots habitat
ocelots
Ocelots are cats, in the family Felidae.
Ocelots do not migrate.
Calories don't "produce" energy; calories are a UNIT OF ENERGY.
Ocelots are cuter to ocelots & wolves are cuter to wolves. Otherwise, they might never mate!
If ocelots can get it then, yes they do eat fish!
mini adult ocelots
Ocelots don't live in packs