Fish monitoring technique has been widely used in water quality monitoring and early warning system. The change of fish activity electrical potential power spectrum was used instead of the change of traditional fish activity electrical potential to monitor the water condition. In this way, the fish activity electrical potential was related with the frequency. Then the data could be accurately distinguished into respiratory electrical potential and swimming electrical potential etc. By using the change of the ratio of various activity powers to the total power, a standard to reflect the change of fish activity was established after the water was polluted by the toxicants. By using Oryzias latipes as the biological indicators of cyanide and fenitrothion, the sensitivity of the designed monitoring system and the accuracy of the pollution criteria can be tested.%鱼类监测技术已普遍应用于水质监测预警体系中.在原有利用鱼的活动电位变化监测有毒物质方法的基础上, 以鱼类活动电位的功率频谱密度测量取代原有的电压测量.通过分析鱼类活动所产生的电位与频率的对应关系, 进而将鱼类活动电位细分为呼吸电位和游泳电位等.再将各类活动功率在鱼类运动总功率中所占比值的变化作为毒物投入后鱼类运动行为的变化判断标准.最后以青鳉鱼 (Oryzias latipes) 作为氰化物和杀螟硫磷的实验生物, 进而检测鱼类监测系统的灵敏性和污染判定依据的准确性.
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