A peek into mass mortality caused by antimicrobial resistant Edwardsiella tarda in goldfish, Carassius auratus in Kerala.

ABSTRACT: Edwardsiella tarda is one of the serious threats affecting the worldwide aquaculture. In the present study, four isolates were recovered from diseased goldfish, showing hemorrhages, reported with 60% mass mortality in an ornamental fish farm, Ernakulam, Kerala. Based on the phenotypic and genotypic analysis, the bacteria were identified as Edwardsiella tarda, Citrobacter freundii, Acinetobacter junii and Comammonas testosteronii. Experimental challenge studies using healthy goldfish revealed that among the four isolates, E. tarda alone leads to 100% mortality of experimental fish within 175 degree days and the pathogen could be successfully re-isolated from the moribund fish. The LD50 value of E. tarda was calculated as 9.9 × 10⁵ CFU/fis

SUBMITTER: Preena PG 

PROVIDER: S-EPMC8764882 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature