Characterization of Pathogenic Pseudomonas alcaligenes Isolated from Koi Carp in China,Journal of Aquatic Animal Health

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Characterization of Pathogenic Pseudomonas alcaligenes Isolated from Koi Carp in China
Journal of Aquatic Animal Health ( IF 1.2 ) Pub Date : 2021-07-30 , DOI: 10.1002/aah.10141
Jie Bai ₁ , Yian Huo ₁ , Xiucai Hu ₁ , Aijun Lü ₁ , Jingfeng Sun ₁

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Pseudomonas alcaligenes infection is rare in aquaculture. In this study, we provide the first report on the characterization of P. alcaligenes from koi (a variant of Common Carp Cyprinus carpio) in China. A gram-negative bacterium was isolated from the diseased koi and was named KCP-516. Morphological and biochemical tests as well as phylogenetic tree analyses derived from 16S ribosomal RNA, gyrase subunit A, and gyrase subunit B gene sequencing all strongly indicated that the isolate KCP-516 was P. alcaligenes. In liquid medium, the optimal growth conditions were 25°C, 2.5% NaCl, and pH 8. The pathogenicity of the isolate was demonstrated in koi, with 7.0 × 10⁴ CFU/g fish weight identified as the dose lethal to 50% of test fish. The results will provide a scientific reference for the diagnosis and treatment of P. alcaligenes infection.

更新日期：2021-07-30

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