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Diseases of Aquatic Organisms

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DAO 150:53-60 (2022)  -  DOI: https://doi.org/10.3354/dao03674

Prolonged low-salt immersion effectively controls Flavobacterium columnare infection in Murray cod Maccullochella peelii peelii

Zhenguo Zhang1,2, Shuang Hao3, Xiaohui Bai3, Hongzheng You3, Yanhui Wu2, ShouMing Feng2, Lianying Zhang3, Zhang Luo1,3,*

1College of Fisheries, Tianjin Agricultural University, Tianjin 300384, PR China
2Prevention and Cure Center for Animal Disease in Tianjin, North of Yixingfu, Tianjin 300221, PR China
3Tianjin Fishery Research Institute, 442 Jiefangnan Road, Tianjin 300221, PR China
*Corresponding author:

ABSTRACT: A disease outbreak occurred in Murray cod Maccullochella peelii peelii in a recirculating aquaculture farm in Tianjin city, China, in 2019. Strain MRX-2019 was isolated and considered to be the etiological pathogen; it was identified as Flavobacterium columnare based on a 16S rDNA gene sequence analysis and physiological and biochemical tests. The effect of salinity on the growth of MRX-2019 was investigated in vitro. Salinity >4‰ (i.e. 6‰) inhibited MRX-2019 growth, whereas 8 and 10‰ salinity killed it. The effect of 4‰ salinity on F. columnare was not significant (p > 0.05). When MRX-2019-infected Murray cod were treated with 4, 6, or 8‰ salinity, the mortality rate was reduced by 8.9, 67.76, or 75.56%, respectively, compared with that of the control. However, the mortality rate increased by 7.77% at 10‰ salinity. In this study, we found that maintaining the fish in freshwater with 6-8‰ salinity effectively reduced the mortality of these fish when infected with F. columnare. The findings provide an environmentally friendly control strategy for columnaris disease in Murray cod.


KEY WORDS: Maccullochella peelii peelii · Flavobacterium columnare · Salinity


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Cite this article as: Zhang Z, Hao S, Bai X, You H and others (2022) Prolonged low-salt immersion effectively controls Flavobacterium columnare infection in Murray cod Maccullochella peelii peelii. Dis Aquat Org 150:53-60. https://doi.org/10.3354/dao03674

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