Method for keeping aquatic animals alive over long period of time
AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsNaoya Kominami, Hirokazu Fukumi, Naokuni Yamawaki, Junji Nomura
Life of this patent
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Abstract
Aquatic animals can be kept in living condition over a long period of time by placing the aquatic animals in environmental water in a large density of more than 200 kg/m.sup.3 ; maintaining the temperature of the environmental water at a lowest possible level in which it is possible for the aquatic animals to exist; controlling the concentrations of ammonia compounds, water-soluble organic compounds and carbonic acid radical in the environmental water so that their levels do not exceed 20 ppm, 150 ppm and 1,000 ppm, respectively; and regulating the concentration of molecular oxygen dissolved in the environmental water so that it is 3 ppm or more.
Claims20
A method for keeping aquatic animals alive over a long period of time substantially without feeding them and in a high density in environmental water, comprising the steps of:
- (A) placing aquatic animals in environmental water;
- (B) controlling the temperature of said environmental water so that said temperature is maintained at the lowest possible temperature range in which said aquatic animals are able to exist;
- (C) controlling ammonia compounds in said environmental water so that the total concentration thereof does not exceed 20 ppm;
- (D) controlling water-soluble organic compounds in said environmental water so that the total concentration thereof does not exceed 150 ppm;
- (E) controlling carbonic acid radical in said environmental water so that it does not exceed a concentration of 1000 ppm and;
- (F) regulating molecular oxygen dissolved in the environmental water so that its concentration is maintained at 3 ppm or more, the concentrations of said ammonia compounds and water-soluble organic compounds in said environmental water being controlled by bringing said environmental water into contact with a hypohalite so as to oxidize said ammonia compounds and said organic compounds therein while the hypohalite is converted to halide non-toxic to said aquatic animals.
Dependencies are inferred from the claim text.