FIELD: industrial fish-breeding. SUBSTANCE: when indications for sulfide intoxication in fish are stated, one determines sulfide concentration in water and injurious effect of sulfide is suppressed by adding hydrogen peroxide into water reservoir at its ratio to sulfide (4-17):1 but not exceeding hydrogen peroxide concentration 0.001 mole/cu.dm. Hydrogen peroxide can be added in the form of solution with concentration no higher than 1 mole/cu. dm at stirring. EFFECT: facilitated prevention of fish mortality directly in intoxicated water reservoirs. 2 cl, 1 dwg _
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