不同盐度条件下氨氮对双齿围沙蚕的毒性研究

Study on the Toxicities of Ammonia-N to Perinereis aibuhitensis under Different Salinities

[目的]研究双齿围沙蚕在不同盐度条件下对氨氮的耐受能力。[方法]在水温(27.0±0.5)℃、pH值为8.10的条件下,研究3种盐度(15‰2、5‰和35‰)下氨氮海水对双齿围沙蚕的急性毒性。[结果]在相同盐度下,氨氮浓度越高,作用时间越长,双齿围沙蚕的死亡率越高;在相同氨氮浓度下,盐度越低,双齿围沙蚕的死亡率越高,在15‰、25‰和35‰3种盐度下,总氨和非离子氨对双齿围沙蚕的安全浓度分别为3.31和0.23、3.84和0.254、.31和0.27 mg/L。氨氮对双齿围沙蚕的毒性表现出剂量效应和时间效应,并受盐度影响,盐度升高,毒性下降,双齿围沙蚕对氨氮的耐受能力增强。[结论]该研究为双齿围沙蚕的健康养殖提供了科学指导。

[Objective] The purpose was to study the enduring abilities of Perinereis aibuhitensis to ammonia N under different salinities. [Method] The acute toxicities of seawater containing ammonia N at 3 salinities （15‰,25‰ and 35‰） to P. aibuhitensis were investigated under the condition with water temperature at （27.0±0.5）℃ and pH at 8.10. [ Result ] Under the same salinity, the higher the ammonia- N cohen, was and the longer its reaction time was, the higher the mortality of P. aibuhitensis was. Under the same ammonia-N conch, the lower the salinity was, the higher the mortality of P. aibuhitensis was.Under 3 salinities of 15‰,2‰ and 35‰,the safe eonen.of total N and non-ion N to P. a/buh/tens/s were 3.31 and 0.23,3.84 and 0.25,4.31 and 0.27 mg/L resp.The toxicity of ammonia-N to P. aibuhitensis showed dosage and time effects and was affected by salinity.When the salinity was rising,the toxicity was decreased and the enduring ability of P. aibuhitensis to ammonia N was strenrthened. [Conclusion] The study provided the scientific guidance for healthily culturing P. aibuhitensis.