The copepod Acartia tonsa was standardized as model organism in acute toxicity bioassays due to its key position in coastal food chains and high sensitivity. Once bioassays are performed according to a protocol their results may become tools for the protection of aquatic ecosystems. However, there are divergences in bioassays methods using A. tonsa. This study aimed to investigate: (i) the need for acclimation of A. tonsa collected from the environment for use in acute toxicological bioassays; and (ii) differences in sensitivity between copepods collected from the environment and laboratory-grown copepods. Laboratory-grown copepods are more sensitive to SDS than A. tonsa from the environment. The acclimation time of 30 h helped organisms to recover from stress of collection/handling and changing environment/conditions. Therefore, laboratory-grown copepods showed to be more sensitive than organisms from environment; and for ecotoxicological bioassays acclimating A. tonsa collected from the environment for 30 h can be adopted.

pe足类A螨由于在沿海食物链中的关键地位和高敏感性，被标准化为急性毒性生物测定中的模型生物。根据协议进行生物测定后，其结果可能会成为保护水生生态系统的工具。但是，使用扁桃体的生物测定方法存在分歧。这项研究旨在调查：（i）从环境中收集的用于急性毒理学生物测定的扁桃体的适应性需求；和（ⅱ）在从环境中收集桡足类实验室培养的桡足类之间的灵敏度差异。实验室生长的pe足类动物比S.tona对SDS更敏感 来自环境。30 h的适应时间帮助有机体从收集/处理和不断变化的环境/条件的压力中恢复过来。因此，实验室生长的co足类动物比环境中的生物更敏感。对于生态毒理学生物测定，可以采用从环境中收集30 h的扁桃体。