Journal
AQUACULTURE
Volume 534, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.aquaculture.2020.736193
Keywords
Micropterus salmoides; Nocardiosis; Pathological study; Comparative study
Categories
Funding
- Funded of Open topic of the Key Laboratory of Freshwater Fisheries Healthy Farming of the Ministry of Agriculture and Rural Affairs [ZJK202004]
- Fund of Sichuan key R&D program key technology project [2020YFN0060]
- Fund of Chengdu Science and Technology Bureau key RESEARCH and development support plan [2019-YF05-00835-SN]
- Fund of Chengdu Technology Innovation research and development Project [2019-YF05-02018SN]
- fund of Integrated Research and Application of healthy aquaculture technology for livestock, poultry or aquaculture [2020-YF09-00038SN]
- Fund of Sichuan rice fish comprehensive breeding cooperative promotion project
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This study described the pathological characteristics of Micropterus salmoides infected with Nocardia sp. and found differences in the pathological features in recent years, indicating a more serious disease in Micropterus salmoides. The results suggest that the pathogenicity of Nocardia sp. infecting Micropterus salmoides may have improved.
As a major cultured species of Perciformes, Micropterus salmoides has become an important commercial fish in China. However, Nocardia sp. has struck the M. salmoides production and caused the morbidity of more than 70%. This study described the pathological characteristics of M. salmoides infected with Nocardia sp. and analyzed the pathological characteristics differences since the first infection in M. salmoides and other Perciformes. Some differences of the pathological features in recent years emerged comparing with the previous cases, which manifested as the nodules in ulcerated tail muscle, granulomas in the dermis layer, fin, the muscle of eyes and head kidney. Moreover, this study revealed more detailed histopathological features including the decrease of lymphocytes and renal interstitial hematopoietic cells in the spleen, congested of the glomeruli, and dilated of the renal capsule. Besides, hepatocytes were loosely arranged, and mucosal epithelial cells of intestines were necrotic and disintegrated. Our results showed that there are no visible differences between M. salmoides nocardiosis and other species of Perciformes, but in recent years this disease in M. salmoides showed more serious pathological alterations. These results indicated that the pathogenicity of Nocardia sp. infecting M. salmoides may have improved, and it is urgent and important to build a program to prevent and control the relevant diseases.
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