论文部分内容阅读
通过NO2--N对吉富罗非鱼的急性毒性试验,研究了NO2--N胁迫过程中的应激反应,pH和NaCl浓度对毒性的影响,以及不同生态环境下吉富罗非鱼对亚硝态氮毒性的耐受性差异等,结果表明:在受试鱼急性中毒96h全致死条件下(NO2--N最小浓度192.49mg/L、PH7.37),当水体pH为6.21±0.19、7.09±0.20、8.40±0.22时,全致死时间96h分别变为62、88、102h,当NaCl浓度达到400.00mg/L时,其解毒作用极其显著(P<0.01)。在受试鱼急性中毒48h不死亡条件下(NO2--N最大浓度60.87mg/L,29.7±1.2℃),温度剧降10±0.8℃时,应激反应发生在持续中毒32h后,中毒40h后受试鱼全部应激致死。生活在温室内水泥池、室外水泥池、土池池塘的吉富罗非鱼对NO2--N耐受性存在很大差异。
Through the acute toxicity test of NO2 - N to the tilapia, the effects of stress reaction, pH and NaCl concentration on the toxicity of NO2 - N stress and the effects of nitrite The results showed that under the conditions of 96h lethality (NO2 - N minimum concentration 192.49mg / L, pH7.37), when the water pH was 6.21 ± 0.19, 7.09 ± 0.20,8.40 ± 0.22, the lethal time of 96h became 62, 88 and 102h, respectively. When the NaCl concentration reached 400.00mg / L, the detoxification effect was extremely significant (P <0.01). Under the condition of no death of acute poisoning fish 48h (maximum NO2 - N concentration 60.87mg / L, 29.7 ± 1.2 ℃) and temperature drop 10 ± 0.8 ℃, the stress reaction occurred after 32h poisoning and 40h poisoning After all the stress test fish died. There is a great difference in NO2 - N tolerance among the tilapia tilapia living in the greenhouse cement pond, outdoor cement pool and soil pool.