Fish really shouldn't be flushed. For one thing, there's a possibility of introducing pathogens into local waterways. For another, the poor thing is going to die a slow, painful death from the chemicals in the water. Fish aren't "evil" on purpose, they're just doing what their instincts are telling them to do. They don't deserve to die painfully for acting exactly how they're supposed to act. If there's no other option than killing them, blunt force to the skull or clove oil are both much more humane ways.
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My current project, a 65 gallon aquarium stocked with vernal pool fauna.