When tropical shrimps are kept in recirculating aquaculture systems (RAS), one of the limiting factors is the maintenance of a sufficient water quality, and therefore, often disinfectants like peracetic acid (PAA) are added to the water either as prophylactic or treatment measure. In this study, PAA in concentrations of 0.1 mg/L, 1 mg/L and 10 mg/L was applied continuously for 56 days to small‐scale seawater RAS stocked with Litopenaeus vannamei. Treatment with 0.1 mg/L did not result in a reduction in the total bacterial amount and therefore was not effective. A concentration of 10 mg/L led to significant changes in the chemical water parameters already after 2 days and was therefore not recommendable. A concentration of 1 mg/L led to increased levels of ammonia and nitrite within 2 days and to a significant increase in the bacterial amount in the water, most probably due to an enhanced growth of heterotrophic bacteria. The microflora showed significant fluctuations, and there were indications that the welfare of the shrimps was affected. Using 1 mg PAA/L for prophylactic use is therefore also not recommendable but might be an alternative option for short‐term treatment in cases of disease outbreaks.

中文翻译：

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过氧乙酸消毒对太平洋白对虾（南美白对虾）海水养殖循环系统微生物群落的影响。

将热带虾放在循环水产养殖系统（RAS）中时，限制因素之一是维持足够的水质，因此，经常将诸如过氧乙酸（PAA）之类的消毒剂添加到水中，以作为预防或处理措施。在这项研究中，将浓度为0.1 mg / L，1 mg / L和10 mg / L的PAA连续56天施用于凡纳滨对虾的小型海水RAS。用0.1mg / L的处理不会导致细菌总数的减少，因此是无效的。2天后，浓度为10 mg / L已导致化学水参数发生明显变化，因此不建议使用。1 mg / L的浓度导致2天之内氨和亚硝酸盐含量增加，并且水中细菌数量显着增加，这很可能是由于异养细菌的生长增强所致。菌群显示出明显的波动，有迹象表明虾的福利受到影响。因此也不建议使用1 mg PAA / L预防性使用，但在疾病暴发时可以作为短期治疗的替代选择。