Study on the harm and prevention methods of calcium carbonate concentration oversaturation in the process of breeding rotifers in well salt water
In order to explore the difference in rotifer yield between natural seawater and well salt water mixed with natural seawater,improve the unit yield level of rotifer,and find the environmental impact factors that limit rotifer yield,12 rows of 5 natural seawater rotifer ponds and 18 rows of 5 natural seawater rotifer ponds mixed with well salt water were selected for investigation,and the proportion of well salt water accounted for≥50％of the total amount.The changes of water temperature and pH on 15 days were continuously monitored,the physical and chem-ical indexes of water bodies,including alkalinity,salinity and calcium ions,were regularly determined,the satura-tion index of critical mutation of crystalline CaCO3·H2O was calculated,and the total output of rotifers in each pool was tracked and recorded.The results showed that compared with natural seawater ponds,well salt water mixed ponds were more prone to water quality mutations,and the number of mutations increased significantly,with an average of 0.4±0.49 times in natural seawater and 2.6±0.49 times in well salt water mixed ponds.The alkalin-ity of the well salt water mixed pond was generally high,with an average of 4.18±0.10 mmol/L,and that of the natural seawater was 2.63±0.22 mmol/L.The yield of rotifer in ponds supplemented with well salt water was sig-nificantly lower than that in normal ponds(P＜0.01),and the average yield per mu was about 250,000 kg lower.The results showed that mixing well salt water in the rotifer pond would increase the mutation of the water body and eventually lead to a large reduction of rotifer production.
well salt watercalcium carbonate supersaturationabrupt change of water qualityrotifer(Brachionus plicatilis)
万方数据
维普
