This is my fish Jerry! He is about 3 years old but I have no idea what type of fish he is, he is around 13cm long and has little whiskers either side of his mouth. I have no idea what type of fish he is as what I originally brought him as, when I got home and googled him, I couldn't find it anywhere! I have searched since then but have had no luck!
Thank you!

Looks like most probably a koi He looks a bit of a strange shape and at 3 years old ought to be a lot bigger than that. What size tank is he in?