Diet question from a rookie

[biotat1969]

1st, here are my numbers as of today...
weight 185
body fat% checked by trainer at gym 17.25%
height 5' 9"
This is what I eat every day...
6:00 Am 1 bowl of oatmeal (no milk) and 1 banana
9:00 Am 1 tin of pink salmon
12 noon 1 chicken breast, half dozen pieces of broccoli, 1 tin of pink salmon (wild caught BTW)
2:00 Pm yet another tin of salmon, cheap so I eat alot of it
4:00 I make a smoothie with 1 banana, 1/2 dozen strawberries, 1 kiwi, 1 slice of raw beet, and 4 scoops of protien powder.
7:00 dinner, either chicken and veggies or fish and veggies
Question is that I make great muscle gains but I have a gut that will not leave me for anything.
I train 3 days on 3 days off with one cheat day per week. Nothing extream BBQ and a soda
Is my diet all wrong or something I am not doing?
I just realized I posted in the wrong forum, mods please move to nutrition