eISSN: 1644-4124
ISSN: 1426-3912
Central European Journal of Immunology
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SCImago Journal & Country Rank
3/2017
vol. 42
 
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abstract:
Experimental immunology

The effect of Aeromonas hydrophila infection on the non-specific immunity of blunt snout bream (Megalobrama amblycephala)

Hu Xia
,
Ying Tang
,
Fenghui Lu
,
Yushuang Luo
,
Pinhong Yang
,
Wenbin Wang
,
Jigang Jiang
,
Na Li
,
Qing Han
,
Fei Liu
,
Lianggvo Liu

(Centr Eur J Immunol 2017; 42 (3): 239-243)
Online publish date: 2017/10/30
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Aeromonas hydrophila is the main reason of epidemic septicaemia for freshwater fish. In the present study, the effect of Aeromonas hydrophila infection on the non-specific immunity of blunt snout bream (Megalobrama amblycephala) was studied. After Aeromonas hydrophila challenge, lysozyme activity was significantly increased at 4 h, 1 d, 3 d, 5 d, 14 d and 21 d. An increased level of lysozyme activity indicated a natural protective mechanism in fish. The significant increases of superoxide dismutase activity and catalase activity in treatment group were detected at 4 h, 1 d, 3 d, 5 d, 14 d and 21 d after Aeromonas hydrophila challenge. Increase in the superoxide anion and H2O2 is considered to be beneficial for self-protection from disease. Acid phosphatase activity increased significantly at 1 d, 3 d and 5 d after Aeromonas hydrophila challenge. Alkaline phosphatase activity in treatment group showed significant increase at 4 h, 1 d, 3 d, 5 d, 14 d and 21 d compared to control group. Increased phosphatase activity indicates higher breakdown of the energy reserve, which is utilized for the growth and survival of fish. These results revealed that the non-specific immunity of fish played an important role in self-protection after pathogens infection.
keywords:

Blunt snout bream (Megalobrama amblycephala), Aeromonas hydrophila, SOD, Catalase activity, lysozyme activity, non-specific immunity

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