Akademik Veri Yönetim Sistemi
Kahramanmaraş Sütçü İmam Üniversitesi Fen ve Mühendislik Dergisi, cilt.11, sa.11, 2023 (ESCI)
Aquaculture is arguably the fastest growing industry in global food animal production, but diseases and related mortalities are the main factors that determine the limits of production volume. Fish in aquaculture systems are susceptible to infectious agents as they are kept in a densely populated and often physically restricted environment. Genus Aeromonas include well-known pathogens, and the member Aeromonas veronii has been reported to cause diseases in both humans and animals, either as primary infection or as mixed infection with other pathogens. This study describes a low mortality epizootic caused by Aeromonas veronii biovar veronii in European seabass (Dicentrarchus labrax) farmed in the Aegean Sea. The gills, kidneys and livers of moribund fish were pale. Erythema, haemorrhage and superficial ulcerative lesions were detected on the skin. In addition, petechial haemorrhage was observed on the tongue, maxilla and operculum. The spleen was enlarged and multiple abscesses were detected in both the liver and the spleen. Granulomas were observed in the spleen and the kidney. Some fish had skin depigmentation, ecchymosis in the liver and a bloody exudate in the abdominal cavity. The intestinal walls were lined with a clear yellowish fluid. Twenty-nine motile, Gram-negative bacterial isolates were obtained from the internal organs of diseased fish. According to morphology, biochemical properties and 16S rRNA gene sequencing results, all isolates were identified as Aeromonas veronii bv. veronii. All isolates were resistant to amoxicillin and ampicillin but, only intermediate resistant to sulfamethoxazole/trimethoprim.