While there are always new systems and ideas under development in the world of aquaponics, there are three main methods that have been tested enough to recommend for commercial use. Before you can create a business plan, estimate your costs, or project profits based on specific production volumes, you’ll need to pick one of these three methods. They all work generally in the same way; by processing the nutrient filled water from the fish. Yet, they vary greatly in size, production potential, water volume, respective fish stocking rates and more.