Abstract
The occurrence of oxytetracycline (OTC) resistance was examined among bacteria isolated from intestinal contents of yellowtail, Seriola quinqueradiata, and the seawater environment where these animals are cultured. A high prevalence of OTC resistant bacteria was observed in all samples obtained before and after administration of OTC. The Vibrio/Aeromonas group were the predominant bacteria detected in the intestine samples. However, other genera also contained OTC-resistant bacteria.
