Business Feasibility and Environmental Load of Closed Recirculating Aquaculture System Based on Growth Effect in Operation of Water Management System for Saving Cost

Abstract

 Business feasibility and environmental load were evaluated in operation of water management system for saving cost based on the results of breeding experiments for two weeks. We focused on circulation rate, water replacement period and water replacement rate as experimental factors. As a results, bad effect to feed conversion ratio and cortisol were not confirmed. Based on the results, we calculated the cost, it was possible to save cost of total 867 yen/kg. It was also possible to reduce nitrate nitrogen and wastewater by 0~13.6% and 14.7~20.1%, respectively. It was possible to improve the business feasibility and environmental load in operation of water management system for saving cost.