Fish in your dreams may reflect issues you are noticing in yourself or noticing yourself doing. The ocean could symbolize powerful uncertainty or negativity. I'll quote a dictionary site for you.
"To dream of fish represents unconscious thoughts or unconscious truths. Things you may notice about yourself or your life, but aren't fully aware of their underlying causes.
Positively, fish may reflect valuable insight or positive situations that you aren't fully conscious of or don't fully understand.
Negatively, fish reflect emotional problems or negative emotions that you notice yourself having. You may be aware that you have a problem, but don't undestand the underlying issues that created it.
People undergoing therapy or powerful personal growth often dream of fish swimming below the surface of the water to symbolize new insight that they are close to grasping.
The size of a dream fish reflects how significant or important an issue is. A big fish represents something you know is important, but don't understand. A small fish may reflect a small problem that you have difficulty understanding.
To dream of an ocean represents powerful uncertainty in your life. Confrontation with negative situations or negative emotions. Your biggest struggles or most baffling challenges.
To travel across the ocean represents navigating through a phase of your life that's filled with powerful uncertainty or challenges. You are getting through a problematic situation.
To dream of a calm or pleasant ocean view represents stability, and emotional balance. Issues have been confronted or accepted. You are handling yourself well or have taken control of a difficult situation.
To swim or fall into the ocean represents a confrontation or struggle with uncertainty. You are "head deep" in a problem. You may feel overwhelmed by a problem or challenge."
[Source:
DreamBible.com]