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首页> 外文期刊>Applied Microbiology >Relative Abundance of Nitrotoga spp. in a Biofilter of a Cold-Freshwater Aquaculture Plant Appears To Be Stimulated by Slightly Acidic pH
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Relative Abundance of Nitrotoga spp. in a Biofilter of a Cold-Freshwater Aquaculture Plant Appears To Be Stimulated by Slightly Acidic pH

机译：Nitrotoga spp的相对丰度。淡酸性pH刺激冷淡水产养殖植物的生物滤池中的细菌

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The functioning of recirculation aquaculture systems (RAS) is essential to maintain water quality for fish health, and one crucial process here is nitrification. The investigated RAS was connected to a rainbow trout production system and operated at an average temperature of 13°C and pH 6.8. Community analyses of the nitrifying biofilm revealed a coexistence of Nitrospira and Nitrotoga , and it is hypothesized that a slightly acidic pH in combination with lower temperatures favors the growth of the latter. Modification of the standard cultivation approach toward lower pH values of 5.7 to 6.0 resulted in the successful enrichment (99% purity) of Nitrotoga sp. strain HW29, which had a 16S rRNA sequence similarity of 99.0% to Nitrotoga arctica . Reference cultures of Nitrospira defluvii and the novel Nitrotoga sp. HW29 were used to confirm differentiation of these nitrite oxidizers in distinct ecological niches. Nitrotoga sp. HW29 revealed pH and temperature optima of 6.8 and 22°C, respectively, whereas Nitrospira defluvii displayed the highest nitrite oxidation rate at pH 7.3 and 32°C. We report here the occurrence of Nitrotoga as one of the main nitrite-oxidizing bacteria in freshwater aquaculture systems and indicate that a slightly acidic pH, in addition to temperatures below 20°C, can be applied as a selective isolation criterion for this microorganism.
机译：循环水产养殖系统（RAS）的功能对于维持水质对鱼类健康至关重要，而其中一项关键过程是硝化作用。研究的RAS连接到虹鳟鱼生产系统，并在13°C的平均温度和pH 6.8的条件下运行。硝化生物膜的社区分析表明，硝化螺菌和硝化螺菌并存，据推测，微酸性的pH值与较低的温度相结合有利于后者的生长。将标准栽培方法修改为将pH值降低到5.7至6.0，可以使Nitrotoga sp成功富集（99％纯度）。菌株HW29，其与大白蚁（Nitrotoga arctica）的16S rRNA序列相似性为99.0％。 Nitrospira defluvii和新型Nitrotoga sp。的参考培养HW29用于确认这些亚硝酸盐氧化剂在不同生态位中的分化。 Nitrotoga sp。 HW29的最适pH和最适温度分别为6.8和22°C，而Detrovii Nitrospira在pH 7.3和32°C时显示出最高的亚硝酸盐氧化速率。我们在这里报告了硝基苯甲酸作为淡水水产养殖系统中主要的亚硝酸盐氧化细菌之一的发生，并表明除温度低于20°C外，略带酸性的pH值可以用作该微生物的选择性分离标准。

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