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为研究饲料镉对罗非鱼的急性毒性及其在饲料中的安全限量,将180尾罗非鱼随机分为6组,投喂镉含量分别为0、0.10%、0.25%、0.50%、1.00%和2.00%的饲料,每组3个重复,每重复10尾鱼。记录96 h鱼的病死率及中毒症状,并计算96 h半致死量(LD50)和安全限量。结果表明:罗非鱼饲料镉急性中毒症状与水环境中重金属致鱼中毒症状类似;饲料镉对罗非鱼的96 h LD50为(49.67±6.11)mg/kg体质量(BW),安全限量为0.47 mg/kg。
In order to study the acute toxicity of feed cadmium on tilapia and its safety limit in feed, 180 tilapia were randomly divided into 6 groups, and the levels of cadmium were 0, 0.10, 0.25, 0.50, 1.00 % And 2.00% feed, 3 replicates per group, 10 fish per replicate. The mortality and poisoning symptoms of fish at 96 h were recorded and the LD50 of 96 h and the safety margin were calculated. The results showed that the symptoms of acute toxicity of tilapia dietary cadmium were similar to the symptoms of fish poisoning caused by heavy metals in water environment. The LD50 of feed cadmium to tilapia at 96 h was (49.67 ± 6.11) mg / kg body weight (BW) and the safety margin was 0.47 mg / kg.