순환여과장치이용의 뱀장어사육시 어병방제약품이 여과조기능에 미치는 영향

EFFECT OF SOME PESTICIDES TO THE ABILITY OF THE FILTERATION AT EEL CULTURE USING RBCIRCULATING FILTER SYSTEM

순환여과장치에 의한 어류사육시 어병방제의 목적으로 약품을 사용하는 일이 많다. 이 때, 이들 약품이 여과 조중의 산화분해세균을 사멸시켜 여과기능을 마비시킬 우려가 있어 여과를 중단시키고 약품을 처리하므로, 큰 불편을 주고 있다. 이번에 뱀장어 양식시에 흔히 사용되는 formalin 33ppm+malachite green 0.15ppm 혼합처리, dipterex 0.25ppm 처리 및 furanace 0.1ppm 처리가 여과기능에 미치는 영향을 주로 DO 소비량 및 ammonia 처리능력에서 시험검토하여 본 결과 별다를 영향을 미치지 않는다는 것을 알았다. 따라서 이상의 약물을 사용할 경우에 여과를 중단시키지 않아도 상관이 없다고 인정된다.

When rearing fish at recirculating filter systems, some pesticides are often used for controling various fish diseases. In this case, the pesticides are usually applied after stopping the filteration, from a view point of affecting the filtering ability of oxidation and decomposition by killing the decomposing bacteria in the filter system. Therefore, a great inconvenience is usually net. The authors carried out a series of experiments, and the influence of 3 kinds of treatments of pesticides, formalin 33 ppm+matachite green 0.15 ppm, dipterex 0.25 ppm, and furanace 0.1 ppm, to the filtering ability expressed as the consumption rate of dissolved oxygen and depletion of ammonia-nitrogen during the passing time through the filter layer was investigated, and it was found out that these pesticides with above mentioned concentrations which is normally used for controling several kinds of diseases and parasites during the time of eel culture, did not affect the filtering ability. Consequently, it can be said that these pesticides with above mentioned concentrations can he used without stopping filteration.