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研究壳聚糖对水环境锌致罗非鱼急性毒性的影响,将540尾罗非鱼随机分为2个处理组,即对照组和试验组。每处理组分3个重复,每重复90尾鱼。对照组按照水生生物急性毒性试验方法进行锌对罗非鱼的急性毒性试验;试验组养殖水体中加入壳聚糖,同法进行锌对罗非鱼的急性毒性试验。结果表明:对照组48 h的半致死质量浓度(LC50)为(18.39±1.68)mg/L,试验组为(26.65±2.84)mg/L,差异显著;对照组96 h的LC50为(9.34±0.94)mg/L,试验组为(13.53±0.81)mg/L,差异显著。说明养殖水体中加入壳聚糖具有缓解锌致罗非鱼急性毒性的作用。
To study the effect of chitosan on the acute toxicity of zinc to tilapia in water environment, 540 tilapia were randomly divided into two treatment groups, control group and experimental group. Three replicates per treatment, 90 fish per replicate. In the control group, the acute toxicity test of zinc to tilapia was conducted according to the acute toxicity test method of aquatic organisms. Chitosan was added into the aquaculture water of the experimental group, and the acute toxicity test of zinc to tilapia was carried out in the same way. The results showed that the LC50 of the control group at 48 h was (18.39 ± 1.68) mg / L, and the difference was significant at the experimental group (26.65 ± 2.84) mg / L; the LC50 at 96 h in the control group was (9.34 ± 0.94) mg / L, the test group was (13.53 ± 0.81) mg / L, the difference was significant. The results showed that adding chitosan to aquaculture water could relieve the acute toxicity of zinc to tilapia.