Abstract
Catfish is one of the major aquaculture species in the United States. However, the catfish industry is threatened by several bacterial diseases such as enteric septicemia of catfish (ESC), columnaris disease and Aeromonas disease, as well as by abiotic stresses such as high temperature and low oxygen. Research has been conducted for several decades to understand the host responses to these diseases and abiotic stresses. With the development of sequencing technologies, and the application of genome-wide association studies in aquaculture species, significant progress has been made. This review article summarizes recent progress in understanding the molecular responses of catfish after bacterial infection and stress challenges, and in understanding of genomic and genetic basis for disease resistance and stress tolerance.
Highlights
Diseases cause significant amount of economic losses in aquaculture (Meyer, 1991)
We review progress made in understanding pathogenesis, host responses, and genomic basis for disease resistance of enteric septicemia of catfish (ESC), columnaris, and Aeromonas diseases, as well as for abiotic stress such as heat stress, and hypoxia
Two quantitative trait locus (QTL) on linkage groups (LG) 1 and one QTL on LG 26 were significantly associated with ESC resistance
Summary
Diseases cause significant amount of economic losses in aquaculture (Meyer, 1991). The disease problems in aquaculture systems are increased following exposure to abiotic stresses. Introgression of the superior disease resistance QTL from blue catfish is a realistic approach to develop disease resistant catfish breeds
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