Large scale mortality in cultured Nile tilapia (Oreochromis niloticus): natural co-infection with Aeromonas hydrophila and Streptococcus iniae.

ABSTRACT:

Background

Nile tilapia is a highly valuable fish in the aquaculture sector. A culture farm has reported heavy mortalities of tilapia.

Aims

The present study aimed to identify the etiological agent responsible for the heavy mortality in cage cultured tilapia.

Methods

The moribund and freshly dead fishes were analyzed for clinical signs. Biochemical and molecular characterizations were performed to identify the etiological agents of the disease. Also, polymerase chain reaction (PCR) assay was used to detect the presence of the virulence genes. The susceptibility of the isolates to various antibiotics was tested by the disk diffusion method.

Results

The results of the biochemical tests and PCR assay confirmed that co-infection with Aeromonas hydrophila, an

SUBMITTER: Puneeth TG 

PROVIDER: S-EPMC9681984 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature