Abstract
Bacteria Edwardsiella ictaluri is a major pathogenic bacterium threatening aquatic species affecting the aquaculture industry globally. Previous studies have focused on analyzing bacteria's pathological signs and virulence on pangasius fingerlings. However, the research on the virulence and pathogenicity of Edwardsiella ictaluri in the striped catfish fry stage is still limited. This study was carried out to evaluate the pathogenicity and virulence of Edwardsiella ictaluri bacteria on 45-day-old striped catfish (Pangasianodon hypophthalmus) through infection experiments. A total of 1170 striped catfish were subjected to infection at concentrations of 0, 103, 104, 105, and 106 CFU/mL through the immersion method. After nine days of infection, the results showed that the cumulative mortality of striped catfish ranged from 3.08 to 100%. The lethal dose (LD50) of E. ictaluri on striped catfish fry satge was 7.59 × 104 CFU/mL. At all concentrations, the growth parameters (weight gain; percentage specific growth rate; daily weigth gain; length gain; percentage specific growth rate (length); daily length gain) of striped catfish were reduced compared with the control treatment.
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