关键词: 双叉薮枝虫水母, 高锰酸钾, 硫酸铜, 次氯酸钠, 成活率, Obelia genicutata Linnaeus, potassium permanganate, copper sulfate, sodium hypochlorite, survival rate

Abstract: Obelia genicutata Linnaeus grow and breed well with the right temperature, salinity, bait and other conditions. On the one hand, they directly poison and kill the tender seedlings, and on the other hand, jellyfish compete for baits with seedlings. At present, researches on jellyfish at home and abroad mainly focused on the classification of marine jellyfish and freshwater jellyfish, the embryonic development, effects of ecological factors on their growth and the outbreak mechanism. How to control the outbreak of jellyfish in seedling water has not been reported. In order to explore the inhibitory effect of potassium permanganate, copper sulfate and available chlorine on O. genicutata Linnaeus, the lethal effect of potassium permanganate, copper sulfate and available chlorine to O. genicutata Linnaeus were detected respectively at (28.8±0.7)℃ and with a salinity of (7.4±0.7). The results showed that when the concentration of potassium permanganate was 2.0 mg/L, the average survival rate of O. genicutata Linnaeus at 3 hours was 80.0%, while the average survival rate of O. genicutata Linnaeus at 24 hours was 40.0%. When the concentration of potassium permanganate was 2.9 mg/L, the average survival rate of O. genicutata Linnaeus at 3 hours was 43.3%, while the average survival rate of O. genicutata Linnaeus at 24 hours was 0. When the concentration of copper sulfate was 0.3 mg/L, the average survival rate of O. genicutata Linnaeus at 3 hours was 100%, while the average survival rate of O. genicutata Linnaeus at 24 hours was 56.7%. When the concentration of copper sulfate was 0.6 mg/L, the average survival rate of O. genicutata Linnaeus at 3 hours was 63.3%, while the average survival rate of O. genicutata Linnaeus at 24 hours was 0. When the concentration of sodium hypochlorit was 260 mg/L, the average survival rate of O. genicutata Linnaeus at 3 hours was still 93.3%. When the concentration of sodium hypochlorit was 104 mg/L, the average survival rate of O. genicutata Linnaeus at 24 hours was rapidly decreased to 36.7%. In conclusion, when the concentration of copper sulfate was 0.6 mg/L, O. genicutata Linnaeus were restrained after 24 hours. The effect will be more pronounced, if combined lowdown. The test results were obtained under the condition of good water quality and low organic content. In practical production, various drugs will be degraded by organic components in water especially in seeding water, which contained a lot of organic matter. Therefore, small water test is needed in the process of use.