Abstract: Method and apparatus to grow aquatic life forms, such as different species of fish or shell fish, having concentrically arranged tanks of an appropriate volume to provide an optimum rate of growth of the fish in each stage of their life. The tanks are arranged in surrounding relationship to each other and are successively larger from the inside out so that the fish may be transferred to the next larger tank without physical handling when they have reached their optimum growth for the tank in which they are disposed. Apparatus is provided to circulate water through the tanks and to control the temperature thereof to thereby provide a healthy environment for maximum growth rate of the fish.