What am I?

My colour is orangish and yellowish,

But I’m known as being gold.

I am a fast-swimmer, a flake-eater

I can hear waves crashing near me

But sometimes I live in a bowl.

I have scales to help me swim quicker

And gills to help me breathe.

I have no eyelids

And have a two chambered heart. 

I am cold blooded,

I don’t have any external ears.

I am a prey,

And don’t hunt for food.