When I make salmon for six of us (DH, myself, and boys 10, 7, 5, & 2), I make two entire sides of salmon, usually between 1.75-2 lbs total. DSs 10, 7, & 5 will eat an entire side of salmon by themselves! DS and I will each have a larger portion than you have, plus there will be a leftover serving for lunch for DH the next day. We will usually have salmon with salad, green/mixed vegetables, and homemade bread.
ETA: We do not snack between meals here.