Colorado Parks and Wildlife staff attempt to remove a population of goldfish from a lake. - Source
Don’t release your unwanted pet into the wild.
Don’t buy a fish with the intent of “freeing” them.
It’s not good for the fish and it’s not good for the environment.
Don’t do it.
Look at all these “trash” fish. They were electroshocked to be hauled away. Don’t let your poor decision-making lead to stuff like this.