| In the experiment, the beneficial biological was used to establish and stabilize ecosystem in the ponds to foster Plectropomus leopardus. 4.5 million fertilized eggs of P. leopardus were bought and hatched in the fetching cage for 24 hours under the temperature of 25~28℃. And the average hatching rate was 88.9%, the highest one was 93.3%. After 26~33 days hatching and fostering,497 thousand juvenile fish were reached to 2.0~2.8 cm long, the survival rate was more than 10% and the average survival rate was 12.36%, the highest one was 14.3%. The result showed that the water quality could be regulated preferably with biological and microalgae in the concrete ponds. So the hatching rate and survival rate could be enhanced to foster the juveniles of P. leopardus, and the stable effect of fostering could be got. |
