A square peg in a round hole.
A fish out of water is in an alien environment. If you say that someone is "a fish out of water," then you are saying they are out of their element. Stan the accountant was a fish out of water at the plumbing convention.
to have more important things to do
It means that the thing which is being referred to is totally unnecessary, just like a bicycle is not needed by a fish.
If you think about this, you can figure it out. If fish are trapped in a barrel, how could they get away from a gun? It means something is ridiculously easy.
A fish in a landlocked body of water (such as a pond) would have to come from another source. If in fact it wasnt put in there by man, then it would have had to come there by another means. A fish could swim into a pond from another body of water by underground water sources, or after a flood of a river the fish could have been deposited into the pond.
beached fish and drowned fish
I have bigger fish to fry is an idiom. An idiom is a phrase that is commonly used in certain areas that may have a funny meaning.
Not unless you had another fish in there.
The reference to "fish" in a conversation could be a euphemism to change the topic or introduce a non-sequitur. Similarly, the idiom "like a fish out of water" describes feeling uncomfortable or out of place in a particular situation.
it means your swimming in a pool with dirty water and fish.....get out!
It means you should be willing to risk a small amount in order to get a larger amount back.
Pescado means fish (a fish ready eat). If the fish is in the water swimming, its called pez.