在调查了15套大西洋鲑循环水养殖生产系统的基础上，研究了养殖密度、日投饵量对二氧化碳（ CO2）积累的影响；并选择了养殖密度不同的2套系统，通过比较各水处理单元内的CO2浓度，分析了CO2在系统各单元的动态变化规律。通过相关性分析发现，养殖池中CO2浓度随养殖密度增大而呈上升趋势，两者之间满足线性相关关系（R2＝0．747）；系统日投饵量与养殖池中CO2浓度呈线性相关（R2＝0．5742），且当日投饵率为1．3％时，由于残饵的存在，较大的日投饲量并没有导致相应的CO2积累；同时，密度较高系统各水处理单元内的CO2浓度均比密度较低系统的同等单元高。因此，循环水养殖系统设计过程中应注重CO2脱除设施的设计，以减少CO2积累所带来的潜在胁迫。%Based on the investigations of stocking densities , daily feedings and concentrations of carbon dioxide in 15 sets of Atlantic salmon recirculating aquaculture systems , this research analyzed the influences of stocking densities and daily feedings on the accumulation of carbon dioxide .And then chose two systems which were under the conditions of different stocking densities , and compared the concentrations of carbon dioxide within each water-treatment unit in two systems in order to investigate its dynamic variation . Through correlation analysis , the results showed that the concentration of carbon dioxide increased along with the increasing stocking density , and there was a linear correlation between them ( R2 =0.747 ).Linear correlation was between daily feedings and concentration of carbon dioxide (R2 =0.574 2).When the feeding rate was 1 .3%, the larger amount of daily feedings did not lead to the corresponding accumulation of carbon dioxide due to the existence of residual feeds .The concentration of carbon dioxide within each water-treatment unit in high-density system was higher than it in low-density system .Thus, the production process should focus on the optimization of carbon dioxide removal equipments .
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