Oyster is the seashell which is large in quantity and very common to be eaten in Penghu. However, the waste shells often cause environment pollution and trash problems. Recycling and utilization of waste shells would achieve the purpose of reducing waste and reusing of green energy.
National and international researches indicate that shell powder has bacteriostatic function. In this study, two kinds of oyster shell powders, unheated and heated at 700℃, were used as substrate in Babylonia areolata aquaculture. The substrate of control group is coral sand. The results of growth and water quality detection showed that there was no significant difference among each group. The seawater samples were taken every two weeks to detect total plate count, coliform bacteria and vibrio amount. The results showed that the coral sand substrate was the highest while heated and unheated oyster shell substrate were lower. In addition, number of bacteria of original seawater was lower than all of these groups. Most Babylonia areolata aquaculture in Taiwan use black fine sand as substrate; however, it is detrimental to the growth of Babylonia areolata because that it often causes water to be turbid and contains lots of bacteria. If it is able to use waste oyster shell power to replace black fine sand and coral sand in Babylonia areolata aquaculture, the cultivation rate and growth rate would be enhanced and the disease would be reduced.