대하의 초기생활사에 있어 아질산, 암모니아 및 황화수소의 급성독성
Acute Toxicity of Nitrite, Ammonia and Hydrogen Sulfide for Early Developmental Stages of Fenneropenaeus chinensis
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우리나라 갑각류의 대표적인 양식종인 대하의 초기생활사 동안의 아질산, 암모니아 및 황화수소에 대한 급성독성 수준을 파악하여 각 발달단계에 따른 독성차이를 검토하였다. 아질산에 대한 대하의 mysis, post larva 및 juvenile기의 96시간 반수치사 농도는 각각 18.4, 32.3 및 39.8 mg/L이었고, 암모니아에 대한 대하의 mysis, post larva 및 juvenile기의 96시간 반수치사 농도는 각각 1.43, 3.45 및 3.35 mg/L이었다. 황화수소에 대한 대하의 mysis, post larva 및 juvenile기의 96시간 반수치사 농도는 각각 13.5, 22.7 및 28.5 μg/L이었다. 이들 오염물질에 대한 독성순위는 황화수소>암모니아>아질산 순으로 나타났다. Post larva에 대한 mysis기의 독성수준은 모든 오염물질에서 1.5배 이상을 나타냈고, juvenile에 대한 mysis기의 독성수준은 2배 이상을 나타내어 가장 큰 차이를 보였다. 한편 juvenile에 대한 post larva기의 독성차이는 1.5배 이하를 나타내어 가장 작은 차이를 보였다.
Abstract
Effects of nitrite, ammonia and hydrogen sulfide on survival of the early developmental stages of Fenneropenaeus chinensis were determined under continuous flow-through system. The 96hr-LC50 values of mysis stage were 18.4 mg/L, 0.69 mg/L and 13.5 μg/L for nitrite, ammonia and hydrogen sulfide, respectively; 28.3 mg/L, 1.23 mg/L and 20.7 μg/L for post larva stage and 39.8 mg/L, 1.73 mg/L and 28.5 μg/L for juvenile stage, respectively. The Fenneropenaeus chinensis sensitivity for the three pollutants was in the order of hydrogen sulfide>ammonia>nitrite. The mysis/post larva, mysis/juvenile and post larva/juvenile ratios of nitrite, ammonia and hydrogen sulfide toxicity were >1.5, >2.0 and <1.5 times, respectively, and mysis were found to be more sensitive to pollutants than juvenile in all cases.
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