FISH: idioms

Phrase a person who is important within a small group
a big fish in a small pond
In school Ben was a big fish in a small pond, but after graduation he was just one of the masses applying for a job.
Phrase being in a place or situation that seems unnatural or uncomfortable
like fish out of water
Out on the streets we felt like fish out of water -- so much going on, so many different things to explore.
Phrase have more important things to do or deal with
have bigger fish to fry
I can't spend too much time on this. I have bigger fish to fry.
Phrase used to say that there are many more people available for a romantic relationship
more fish in the sea
Still sad that you and your girlfriend broke up? It'll be okay, there are many more fish in the sea.