摘要
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。
Acute toxicity test of NO^-2-N to GIFT strain Nile tilapia （Oreochromis niloticus） was finished by the usual method of biological toxicity test at different salinity. The stress reaction was studied as the GIFT strain Nile tilapia was being poisoned by NO^-2-N. That the pH and the NaC1 solution were regarded as important influence factors to the acute toxicity of NO？-N also had been studied. The different stress resistance to the toxicity of NO^-2-N was tested by using the fish which had different inhabitation. The results showed that the all-le- thal time （96h） had changed as the pH changed in the solution of the minimum all-lethal con- centration （217.41mg/L） 96 h of NO^-2-N, when the pH were 6.21--t-_0.19, 7.09±0.20, and 8.40±0.22, the all-lethal time had been 62, 88, and 102 hours respectively. When the con- centration of NaC1 arrived at or above the level of 400.00mg/L, the detoxification function of NaCI would become significant difference （p〈0.01）. During the course of poisoning in the solution of 48 h maximal non-lethal concentration （60.87 mg/L, 29.7 1.2 ℃） of NO^-2-N, if the temperature of the solution suddenly dropped down about 10±0.8℃, the stress reaction might reacted at 32 hours and the fish might be all reacted to death after 40 hours. If the fish was used to inhabiting in greenhouse concrete pond, outdoor concrete pond or earthen pond, the ability of stress resistance of each group fish to NO^-2-N was very different.
出处
《海洋湖沼通报》
CSCD
北大核心
2012年第2期69-76,共8页
Transactions of Oceanology and Limnology
基金
中央级公益性科研院所基本科研业务费专项资金项目(6-125021)资助
