This is time consuming as you have to eat 40,000 fish. The fastest way to do this is to go to level 21. Eat all of the small fish in the level. You will not grow fast and will eat a lot of fish. When you are a bought to beat the level, die. As long as you still have continues keep dying. Win you are down to one life beat the level. If you do not beat the level, then you do not get points in the food bank. When you beat the level, just end the game and do it again. By doing this, I was able to get 800 points per try. Note that you do not get points in your food bank when you are playing time attack mode.