Pungcheon Eel Recirculation Aquaculture System by Using Dissolved Ozone Flotation

Abstract

풍천장어는 담수와 해수가 겹쳐지는 하구지역에서 자란다. 염분 농도가 1 % 정도의 물에서 자라는 뱀장어로 육질과 맛이 좋다. 풍천장어의 사육환경의 제한으로 내륙에서는 풍천장어의 양식이 어렵다. 본 연구는 풍천장어의 순환여과양식시스템을 도입하여 내륙에서도 양식할 수 있는 기술을 제시하였다. 순환여과양식시스템은 우선 담수에 인공해수제조 염을 주입하여 1% 염분의 물을 제조한다. 또한 수온을 28~29oC도로 유지하여 풍천장어의 성장률을 높이도록 하였다. 순환여과양식시시템은 사육조, 오존부상 접촉조, 생물여과조, 모래여과, 활성탄 흡착조 로 구성되어 있다. 양식조의 온도, pH 및 용존산소는 실시간 모니터링하여 기록되고, 오존발생장치, 순환수의 펌프, 모래여과 및 활성탄 반응조의 운전은 원격제어가 가능하도록 구성되어 있다. 조사 수질 항목은 탁도, 암모니아성 질소(NH4-N), 아질산성 질소(NO2-N) 및 질산성 질소(NO3-N)와 용존 산소, pH 등이었다. 오존부상조를 중심으로한 풍천장어 순환여과시스템의 운전결과 pH 6.5-7.5, NH4-N은 10mg/L, NO2-N은 1mg/L, NO3-N은 25mg/L, 온도28~29℃를 유지하였으며, 풍천장어의 성장은 0.1kg/d의 높은 성장을 보였다.

Pungcheon eels grow in estuary areas where freshwater and seawater overlap. An eel that grows well in 1% salt water. Due to restrictions in the breeding environment of Pungcheon eels, it is difficult to cultivate them inland. This study was performed to evaluate the recirculation aquaculture system of the Pungcheon eel and feasibility for the technology that can be cultivated even in inland. The recirculation aquaculture system was operated 1% salt water by injecting salt for artificial seawater manufacturing. Also, the water temperature was kept at 28 to 29oC to increase the growing weight of the eel. The recirculation aquaculture system of the Pungcheon eel consists of a culturing tank, a dissolved ozone flotation tank, a biofiltration tank, a sand filtration, and an activated carbon adsorption tank. The temperature, pH and dissolved oxygen of the fish rearing tank are monitored and recorded in real time. And ozone generating devices, circulating water pumps, sand filtration, and activated carbon tanks were operated by remote control. The monitoring water quality items were turbidity, ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, dissolved oxygen, pH, etc. According to the operating results of the recirculation aquaculture system of the Pungcheon eel, pH 6.5-7.5, NH4-N 10mg/L, NO2-N 1mg/L, NO3-N 25mg/L were maintained well for growing the Pungcheon eel. The Pungcheon eel growth weight was 0.1kg/d. Dissolved ozone flotation processes have been successfully applied in experimental freshwater eel recirculation aquaculture systems using a 1.0% salt environment in a cultured style. Pungcheon eel recirculation aquaculture system using the ozone-dissolved flotation (DOF) is a working technology. Good water quality was maintained for all parameters for Pungcheon eel production where the fish are growing well and have good health standards. A complete remote-control system was used to monitor this RAS system.