Sadly you cannot reduce fat on just one spot, you have to reduce your overall body fat. This will reduce belly fat as well in the long run.
It might help if you explained what kind of exercises you are doing, but a generalized approach would be to do more cardio workouts, as these kind of workouts burn more fat compared to weight lifting. (Always be careful when counting calories though, they are nothing more than a rough estimate).
Depending on your abilities and general fitness level I'd recommend that you maybe try to do some jogging additionally to your gym sessions. Other activities would be biking or swimming, but they are more time consuming than simple running. Try to add some minor sporting to your daily routine. If you go by bus, maybe exit one or two stations earlier and walk.
I think rice and fish is a good meal, but maybe try to change it a bit. Some people claim that eating carbohydrates in the evening isn't that good. Whether or not this is true, maybe change you dinner to contain more vegetables instead of rice. If you fry your fish, try to use less fat.
What are you drinking throughout the day? Many people don't realize that they are drinking soda (like coke) the whole day and how much sugar they consume this way, switch to water or tea.
At least do some exercises for the abdominal region. They might be, together with back and shoulder exercises, the most annoying exercises to do, as you don't see fast results here, but they are very important for your posture and overall strength.