Make sure your breakfast compromises of nutritious food like multi-grain bread, fortified cereals, fruits and protein rich food like eggs. Starting your day with an apple or any other fruit along with a protein shake is a good idea to get the proper fiber requirement.
You can add fish to your breakfast if you so desire. However, try different fish each day like tuna or kipper. Fish is and excellent source of Omega 3 and combining it with a thin layer of low fat cheese with whole grain bread makes it a perfect breakfast meal.