Abstract

A series of rearing experiments have been conducted to determine the growth and survival rate in accordance with body size in closed recirculating sea water system. The abalone, Sulculus aquatilis, spat of 10.24<TEX>${\pm}$</TEX>0.85 mm, 0.36<TEX>${\pm}$</TEX>0.l g and 24.9<TEX>${\pm}$</TEX>1.07 mm 2.07<TEX>${\pm}$</TEX>0.57 g in shell length and body weight were used in this study Ranges of water temperature and pH during the rearing period of 90 days were 10.0-24.2<TEX>$^{\circ}C$</TEX> and 7.8-8.2, respectively. Dissolved oxygen during the experiment period was 6.13-7.21 ml/l and inorganic nitrate was 0.68-3.72 <TEX>$\mu\textrm{m}$</TEX> in NH<TEX>$_4$</TEX><TEX>$\^$</TEX>+/-N, 0.17-7.79 fm in NO<TEX>$_2$</TEX>-N and 0.4-11.52 <TEX>$\mu\textrm{m}$</TEX> in NO <TEX>$_2$</TEX>-N, Growth in shell length and body weight of the spat in large group and small group at the end of the experiment were 30.80<TEX>${\pm}$</TEX>3.14 mm, 17.98<TEX>${\pm}$</TEX>2.61 mm and 3.20<TEX>${\pm}$</TEX>0.8 g, 0.36<TEX>${\pm}$</TEX>0.1 g, and survival rate of spat in large group and small group at the end of the rearing experiment were 96.0% and 90.0% , respectively.