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| PRELIMINARY STUDIES ON OXYGEN-DEFICIENCY IN THE ENCLOSED SEAWATER BODIES FOR AQUACULTURE |
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| Oxygen-deficient condition, variation of water quality and elimination of oxygen-deficient condition during the breeding season of prawns and horseshoe crabs arc studied. Along of the disappearance of D.O., the consumption of NO3- and NO2- and the gradual accumulation of NH3, H2S appeared rapidly about 62 hours later. Rather slow was the natural renewal speed of oxygen-deficient condition in the static water bodies. However, with an initial concentration of 1.34mg S2-/L and 3.18mg O2/L in seawater bodies, the reaction was of first order with respect to S2- and had a specific rate constant of 0.04/min. at 27℃ and pH 7.9 (S = 25.7‰) , the half-life period was about 20 min. |
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