If you catch the fish and have no intention to keep it, why did you catch it in the first place?
Didn't you know that even if you decided to let it go alive, you've already put a scare on it's lips when it bite the bait?
And now when you think you don't want the fish and you want to give it to your friend, have you ever think of how the fish would feel?
You catch it, it told itself it belongs to you and now you wanna give it away.

Think like a fish and feel what the fish feel.
Kthxbye.