Bath treatment pharmaceuticals used to control sea lice infestations in the salmonid industry, such as hydrogen peroxide (H₂O₂), are released directly into the environment where non-target organisms are at risk of exposure. The aim of this study was to determine the threshold concentrations for mortality of the Northern krill, Meganyctiphanes norvegica, a major component of the north Atlantic marine ecosystem. To assess the lethal effects of H₂O₂, we carried out a series of 1 h acute toxicity tests and assessed mortality through a 48 h post-exposure period. One-hour exposure to 170 mg/L, corresponding to 10% of the recommended H₂O₂ treatment, caused 100% mortality and a subsequent acute median-lethal concentration LC50 value of 32.5 mg/L. Increased mortality was observed with time in all exposed groups, resulting in successively lower LC₅₀ values during the post-exposure period. The suggested H₂O₂ concentrations have the potential of causing negative effects to the Northern krill.

用于控制鲑鱼业中海虱侵袭的洗浴药物，例如过氧化氢（H ₂ O ₂），直接释放到非目标生物有暴露危险的环境中。这项研究的目的是确定为北磷虾，死亡率门槛浓度Meganyctiphanes norvegica，北大西洋海洋生态系统的重要组成部分。为了评估H ₂ O ₂的致死作用，我们进行了一系列1小时急性毒性试验，并评估了暴露后48小时内的死亡率。一小时暴露于170 mg / L，相当于推荐的H ₂ O _2的10％治疗导致100％的死亡率，随后的急性致命中位数浓度LC50值为32.5 mg / L。在所有暴露组中，观察到死亡率随时间增加，导致暴露后阶段的LC ₅₀值连续降低。建议的H ₂ O ₂浓度可能对北磷虾产生负面影响。