Optimization of Chlorella Farming for Shrimp Aquaculture in Aboveground Ponds

Chlorella farming for shrimp aquaculture in aboveground ponds was optimized by using an experiment with single factor and orthogonal design. Factors for the evaluation included light intensity and the temperature, pH, N/P ratio, and Fe³⁺ concentration in the water for the algae cultivation.A maximized chlorella growth coefficient was reached in 9 to 11 ds by exposing the algae to 7 000 lx light in a pH 8.5 water medium that contained 10:1 N/P nutrients and Fe³⁺ 500 μg·L^-1 at 25℃. Thus, at that time chlorella could be harvested for feeding the shrimps. The practice could not only reduce the cost on feed for the aquaculture, but also stabilize the water quality in the shrimp pond.