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What are the limitations of the energy that can be obtained from the ocean?
 
and
are the different forms of energy obtained from the ocean.
 
Limitations of the energy obtained from the ocean are mentioned below:

The 
of the earth, the sun and the moon influences the tidal energy.

For the conversion of tidal energy into electricity, 
are needed.

To obtain electricity from wave energy, 
are needed.

For trapping the ocean thermal energy, there should be a temperature difference of
 between hot surface water and cold water at a depth.
Answer variants:
more than 20°C
motion
less than 20°C
Tidal energy
very strong waves
ocean thermal energy
relative positioning
high dams
wave energy
heat energy
wind energy