本文研究了紫外线杀菌消毒装置布设在生物滤池前端和后端，对半滑舌鳎循环水养殖系统水环境及鱼类生长的影响情况。结果表明：a. 紫外线装置布设位置的改变与细菌、弧菌的灭杀效果无显著影响（P> 0.05），但对养殖池中的细菌、弧菌数量有显著的影响（P < 0.05）；b. 后置时生物滤池对NH₄⁺-N、NO₂^--N、COD的去除率分别为35.81 %、6.67 %、12.00 %低于前置时的51.51 %、11.54 %、42.45 %；c. 前置时养殖池内氨氮、亚硝酸盐氮的平均浓度分别比后置组低9.7 %、21.6 %；d. 紫外线装置布设位置的改变对半滑舌鳎的生长速度有显著影响（P < 0.05），前置和后置的特定生长率(SGR值)分别为0.21 和0.99，前置时鱼体增重率4.27 %，远低于后置的21.71 %，两者差异显著（P < 0.05）；e. 前置时半滑舌鳎的血液中红细胞数、白细胞数和血红蛋白含量均显著低于后置（P < 0.05）。

This study presents how the UV device affecting the Cynoglossus semilaevis’s RAS environment and its growth by arranging the device in the front end and rear end of biofilter.The results showed that ：a. the change of positions of UV device has no significant effects on sterilize the bacteria and Vibrio，but it has huge impact on the number of bacteria and Vibrio in culture pond；b. when the UV device was placed on the rear end，the biofilter’s removal rate of NH₄⁺ -N，NO₂^- -N，COD was 35.81 %，6.67 %，12.00 %，lower than when it was set on the front end，which is 51.51 %，11.54 % 42.45 %；c. when the device was in the front end，the mean concentration of ammonia nitrogen and nitrite nitrogen was down by 9.7 %，21.6 % than it was on the rear end；d. the change of positions of UV device affects the growth rate of the fish remarkably，The special growth rate (SGR) for the two group respectively were 0.99，0.21，The lead of fish weight gain rate was 4.27 % significantly below the rear of 21.71 %；e.the difference between the two groups was obvious；the number of erythrocyte，leucocyte and hemoglobin of the fish were much lower than the rear group.