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Schematic plan illustrating the treatment and withdrawal period. Rainbow trout were fed diets supplemented with oxytetracycline (OTC) or sulfadiazine/trimethoprim (SDZ/TMP) for 10 consecutive days. Following the 10-day treatment period, all fish were provided non-medicated feed for 25 days. Fecal samples were collected at 10 different time points during the experiment
