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Common Bacterial Fish Diseases and Approaches on Molecular Techniques for Characterization and Early Detection of Pathogens

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Aquaculture Science and Engineering

Abstract

Cultural and serological tests are the earliest methods for the detection of diseases. The histological studies also help for the identification of responsible pathogen causing the disease. Following these have several disadvantages, i.e. laborious and time-consuming, but over 15 years, molecular methods are supportive for early disease diagnosis. Fishes in the asymptomatic stage of the disease can be diagnosed, reducing their dependence on antibiotics. The development of antibiotic resistance among bacterial strains is yet another difficulty that needs to be addressed. At the same time, the prevention of fish diseases also improves socio-economic status among aquaculture farms. These features are essential for initiating early treatment, prevention and control of the disease. The diagnostic methods include microscopic examination of cultures bacterial cells, biochemical tests for bacteria, histopathological examination of fish tissues, and serological tests. The subsequent methods such as polymerase chain reaction (PCR), restriction enzyme digestion, probe hybridization, enzyme-linked immunosorbent assay (ELISA), in-situ hybridization, and microarray are applied in disease diagnosis. So far, molecular methods had led to an improved understanding of genetic characteristics, virulence factor, pathogenicity and host-pathogen interactions. This chapter is the comparative analysis of molecular methods for detecting bacterial fish disease. Such advancements in the techniques gain the scope for novel vaccine development and antibiotics for treatment in the prevention of diseases caused by bacterial fish pathogens.

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Samiappan, S.C., Palanisamy, S., Ravichandran, M., Balasubramanian, B., Issara, U., Arumugam, V.A. (2022). Common Bacterial Fish Diseases and Approaches on Molecular Techniques for Characterization and Early Detection of Pathogens. In: Balasubramanian, B., Liu, WC., Sattanathan, G. (eds) Aquaculture Science and Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-19-0817-0_8

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