protein

Things I can think of is eggs, beans, cheese (yes cheese) lol Milk products

Fish and Chicken are good sources of protein What fish do you usually have, I usually just have breaded haddock or tuna, tuna seems to be the best option.
Other sources of protein can be any meat such as turkey or other red meat such as beef.
Nuts are also good, they have alot of fat in although it's usually healthy fats so all in moderation is good
Dairy products like milk and cheese are good
Pasta and rice is also got a fair bit in but you have to have quite a bit to get a decent amount and that can add up the calories alot.
Plus eggs! Some people choose to just have the egg whites though as it keeps the cholesterol down.
If you find you're running low on protein for the day but don't have many calories left there are also several good protein shakes out there - plenty of people have created threads recently saying which ones they use.

Not sure which fish you eat, but shrimp is high in protein and low in calories, as is salmon. Also try turkey as another source of protein. I've switched from ground beef to ground turkey and I can't taste the difference but it's much lower in cals and just as much protein.

I'm a vegetarian so protein is a challenge for me. I get 100% whey protein at bodybuilding.com and use it to make fresh fruit and vegetable smoothies using a food processor. I have some delicious recipes and I get lots of nutrients in! Just message me if you're interested!