Acute toxicity of DMAH to Oryzias latipes as modified by some influential factors

摘要

As a new insecticide,less information about the aquatic biological toxicity of DMAH[N-（2,4-dimethylphenyl）-N’-methylamidine hydrochloride]is known.Acute 96h static bioassayswere conducted with Oryzias latipes to assess the toxicity of DMAH and the influence of environ-mental factors.The results indicated that,at 23℃,the 24h,48h and 96h LC₅₀are 14.6 mg/L,13.06 mg/L and 12.39 mg/L,respectively,the safe concentration（SC）of DMAH to Oryzias latipes is1.16-1.32 mg/L.The changes of temperature,pH value and hardness of water will significantlyinfluence the toxicity of DMAH to fish.