This presentation reviewed our application of inorganic nitrogens uptake by seaweed to the water quality control for intensive cultivation of shrimp in developing countries, where simple technique of water quality control is required. In the first, the performances to take in ammonia- and nitratenitrogens by seaweed of sterile Ulva spp. collected in a bay of Yokohama, Japan were examined under various conditions. The seaweed could take in and remove inorganic nitrogens in the culture medium effectively. The ambient nitrate-nitrogen did not affect the ammonia-nitrogen uptake. The phenomena of these nitrogens uptake by the algae could be correlated by both of a Michaelis-Menten model with an inhibitory effect and a model based on the permeation through cell membrane. Secondly, the water quality control in the pond of the practical shrimp culture batch was simulated by simple calculation based on the material balance of ammonia-nitrogen with parameters obtained from the above experiments and correlations. The ammonia-nitrogen concentration in the pond could be well controlled by seaweed. Consequently, the water quality control by seaweed was proposed as a simple and convenient method appropriate for the shrimp culture pond in developing countries.
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