为了降低近江牡蛎(Crassostrea rivularis)体内大肠菌群和细菌总数的数量,增加食用牡蛎的安全性,笔者先采用0.4,0.8,1.2 mg· L-1的臭氧浓度进行海水灭菌,确定适宜的臭氧浓度后,再进行臭氧-紫外线系统灭菌海水,进行各净化处理条件试验,探讨适宜的净化近江牡蛎的方法.结果表明,臭氧浓度0.8 mg·L-1为适宜的臭氧浓度;当在温度25℃、盐度8、贝水质量比1∶15、水交换频率4次·h-1、净化24 h的条件下,具有较优的净化效果.这说明臭氧-紫外线系统灭菌的海水,可应用于净化贝类体内的大肠菌群.%An experiment was carried out to reduce the number of the coliform group and the total colony count in Crassostrea rivularis cultured in sea water to ensure food safety.Sea water used for culture of C.rivularis was disinfected with ozone at concentrations of 0.4,0.8 and 1.2 mg · L-1 to select an appropriate ozone concentration for a combinedozone-ultraviolet system used for depuration of the seawater.The seawater was disinfected under the combined ozone-ultraviolet system for 24hrs at different temperatures,seawater exchange rate,and ratio of shellfish to water,and used to rear C.rivularis to find out a seawater depuration method for C.rivularis.The results indicated that the sea water when depurated for 24 hrs with ozone at a concentration of 0.8 mg· L-1,a temperature at 25 ℃,a ratio of shellfish to water at 1∶ 15,salinity at 8 and an water exchange rate at 4 times/h,had a better depuration rate against the coliform group of bacteria in Crassostrea rivularis.This indicates that the combined ozone-ultraviolet system is effective to disinfect the coliform group in Crassostrea rivularis.
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