| 摘要 |
PROBLEM TO BE SOLVED: To safely and effectively exterminate parasites in hatchery fishes by the use of a treating solution which shows fine decomposition in seawater and is not left or accumulated in marine organisms by immersing the hatchery fishes in the specific treating solution. SOLUTION: Parasites in hatchery fishes are exterminated by immersing the hatchery fishes in a treating solution obtained by including peracetic acid as an active ingredient, adding hydrogen peroxide in a concentration of 80-2000 ppm and then neutralizing it with an alkali to preferably pH 7.5 or more. For example, when Fugu rubriges is immersed for 20 min in a treating solution obtained by including peracetic acid in the concentration of 35 ppm at high water temperature of 20 deg.C, adding hydrogen peroxide in a concentration of 150-600 ppm and then neutralizing it with an alkali to pH 7.5 or more, about 80% of Heteraxine heterocerca can be exterminated without damage to Fugu rubriges even when immersed for 60 min. When hydrogen peroxide is added in a concentration of 80-1,000 ppm at 22 deg.C, Fugu rubriges shows no damage for 60 min and when added in the concentration of 2,000 ppm, no damage is shown for 40 min.
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