Tropical shrimp, like Litopenaeus vannamei, in land‐based recirculating aquaculture systems (RAS) are often kept at low water salinities to reduce costs for artificial sea salt and the amount of salty wastewater. Although these shrimp are tolerant against low salinities, innate immunity suppression and changes in the microbial composition in the water can occur. As especially Vibrio spp. are relevant for shrimp health, alterations in the species composition of the Vibrio community were analysed in water from six RAS, run at 15‰ or 30‰. Additionally, pathogenicity factors including pirA/B, VPI, toxR, toxS, vhh, vfh, tdh, trh, flagellin genes and T6SS1/2 of V. parahaemolyticus were analysed. The Vibrio composition differed significantly depending on water salinity. In RAS at 15‰, higher numbers of the potentially pathogenic species V. parahaemolyticus, V. owensii and V. campbellii were detected, and especially in V. parahaemolyticus, various pathogenicity factors were present. A reduced salinity may therefore pose a higher risk of disease outbreaks in shrimp RAS. Because some of the detected pathogenicity factors are relevant for human health, this might also affect food safety. In order to produce healthy shrimp as a safe food for human consumption, maintaining high water salinities seems to be recommendable.

中文翻译：

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水盐度降低对弧菌的组成的影响。太平洋白对虾（南美对虾）循环水产养殖系统及其对虾健康和食品安全的潜在风险

陆上循环水产养殖系统（RAS）中的热带虾，例如凡纳滨对虾（Litopenaeus vannamei），通常保持低盐度，以减少人工海盐和咸废水的成本。尽管这些虾可耐受低盐度，但仍会发生先天免疫抑制和水中微生物组成的变化。如特别是弧菌。虾的健康与虾的健康相关，在六个RAS的水中，以15‰或30‰运行，分析了弧菌社区的物种组成变化。此外，致病因素，包括PIRA / B，VPI，toxR，toxS，VHH，VFH，TDH，TRH，鞭毛蛋白基因和/ 2 T6SS1的副溶血弧菌进行了分析。所述弧菌组合物取决于水的盐度显著不同。在RAS 15‰，潜在致病物种的数目更高副溶血弧菌，V. owensii和V.坎进行检测，特别是在副溶血弧菌，存在各种致病因素。因此，盐度降低可能会导致虾RAS中疾病暴发的较高风险。由于某些检测到的致病因素与人类健康有关，因此这也可能影响食品安全。为了生产健康的虾作为供人类食用的安全食品，似乎建议保持较高的盐度。