Studies On Water And Soil Quality In Polyculured Ponds Of Litopenaeus Vannamei And Cyclina Sinensis

Eight new shrimp ponds were built,in which the preliminary experiments were conducted for comparison between monoculture of Penaeus vannamei Boone and polyculure of Litopenaeus vannamei Boone and Cyclina Sinensis Gmelin in different density.The main content include the sediment of nitrogen,phosphor and carbon in water and soil and several factors else.The main results were:1. It showed that during the feeding period the content of total nitrogen in water and soil was lower in polyculured shrimp ponds,in opposite,the monocultured shrimp ponds had the higher content.The values of total nitrogen in soil followed ?the order:D>C>B>A.2. With the culture time lasting,the content of phosphor and organic carbon increased obviously in sediments in soil,and the content of total phosphor in water and soil was lower in polyculured shrimp ponds than monoculture.In different treatment,the content of phosphor and organic carbon in soil differed very much.3. The filter feeding of Cyclina Sinensis Gmelin in shrimp ponds can increase the transparency and decrease primary productivity in water during the experiment.4. Using laboratory ecological methods,the filter feeding rate were studied at this experiment.The results show that the filter feeding rate of ooooo positively correlated with water temperature and body weight under appropriate temperature conditions. There significant differences in the range of temperature(8~20c),but the difference between 20 and 25 was not signficant.