I think I am going to get a taxidermist to make a replica from the picture. I have no idea if I will ever catch a fish like that again so I might as well get something to remember it by.
I guess replica's last longer and look better than originals as well.
If I am not going to eat it I would rather the thing live for a few more years so I can catch him or her again next year...

Plus a fish like that will pass it's big fish genes on to other fish to hopefully fill the lake with lots of monsters like him.
If he managed to live 20 years I am not going to be the one to kill him.