There are a few ways to quickly yield more fish, or scientifically what they call, increasing the carrying capacity. The first one I would recommend, particularly in FL, is to aerate your pond. Make sure you do it correctly. When done the wrong way it can be bad, but when done right, it'll help out immensely in many ways. There are several very knowledgeable people on here when it comes to aeration. Second, you can look at feeding your fish. Look into purchasing a fish feeder and a quality fish food. Many of the members on here can give you their preferences for both. Last, you can look into fertilizing your pond. However, I be very careful, fertilizing and feeding fish can cause problems. Fertilization can also be tricky for a beginner. Best of luck and welcome to the forum...