Some things that can happen with a fish
A fish that drinks like a fish, that is a fish in excess
A fish that fishes in troubled waters, that is a fish taking advantage of another fish in trouble
A fish that fishes or cuts bait, well, to be or not to be, to retreat or to attack, that is the fishy question
A fish that is neither fish nor fowl, is a fish that is neither one nor the other, lacking some convictions
A fish out of water, is a fish feeling left out, no longer in his accustomed environment