Use reasoning to lead to the answer of the following question:
Where are fish from salt water happiest?
Options:
- river
- boat
- aquarium
- brackish
- ocean
 Reasoning process:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Ocean have most salty water. Fish from salt water stays most happy in ocean than any other place. Therefore, the final answer is ocean.