Development of multi-level aquaculture system using deep sea water

Abstract

A multi-level aquaculture system was established at the Korea Research Institute of Ships and Ocean Engineering, located in Oho-ri, Goseong-gun, Gangwon-do, to develop a multi-level aquaculture system using discharged water from OTEC and establish of sustainable aquaculture technology. In order to reduce energy costs, we Introduced a technique for recycling in stages while maintaining the intrinsic habitat water temperature using deep seawater. In this process, step-by-step water treatment and disease control techniques were applied, and a water environment monitoring system was established. In the aquaculture process, an ozone-based disease control system was applied to adopt a health-friendly type that did not use antibiotics or other drugs. The environment-friendly production system was applied as follows by reusing the breeding water. 1. Seawater circulation filtration system for high density culture of sea cucumber(Step 1: 10 ~ 12 ℃ seawater usage stage) Sea cucumber (Apostichopus japonicas) has recently been increasing in demand mainly in China. However, the conventional capture-recapture culture method is mainly adopted, so the production volume does not increase significantly. Furthermore, the optimum water temperature of sea cucumber is 10-18 ℃, but the water temperature varies greatly with the seasons in Korea. Therefore, the sea cucumber repeats the hibernation and aestivation depending on the season, so the actual growth period is very short, such as 135 ~ 150 days is difficult to produce a stable sea cucumber. The study was conducted to investigate the possibility of year-round aquaculture using a high-density circulation filtration system using deep seawater on land. The system for raising sea cucumbers consisted of six tanks (1 × 3m raceway), one foam separator and two biological filtration tanks. It is a circulation filtration system with a quantity of 20㎥.