| 摘要 |
<p>Growing and keeping aquatic animals in tempered water, purified in closed circuit by a biologically active sludge with the appropriate pre- and after-clarifying steps, takes place by introducing one or more purification steps by means of which inorganic nitrite and nitrate contents in purified water are kept at 1 (0.5) mg/l nitrite and 100 (10) mg/l nitrate. Method is used for cultivating fish, shell-fish and crabs.</p> |
