Now you can remove the guts. This is one of the few waste products of a filleted fish -- unless the fish has eggs, called roe. If you find the orange sacs of roe in your fish, remove them gently, wash them and fry them with a little flour in bacon fat. You will thank me later.
You remove the guts by cutting in the arc of the back of the fish's paunch and tossing it in the trash. Use the point of your knife for this.