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Depletion study and estimation of the withdrawal period for enrofloxacin in pacu (<i><scp>P</scp>iaractus mesopotamicus</i>)
Author(s)
Jonas Augusto Rizzato Paschoal
Lígia Uribe Gonçalves
José Eurico Possebon Cyrino
Félix Guillermo Reyes Reyes
Date Issued
7 de marzo de 2013
Type
Article
Volume
36
Issue
6
Start Page
594
End Page
602
Abstract
Defining the pharmacokinetic parameters and depletion intervals for antimicrobials used in fish will help in the development of important guidelines for future regulations by Brazilian agencies on the use of these substances in fish farming. This paper presents a depletion study for enrofloxacin (ENR) and its main metabolite, ciprofloxacin (CIP), in pacu (Piaractus mesopotamicus) fillets. The depletion study was carried out under monitored environmental conditions, with the temperature controlled at 27 °C to mimic the fish farming conditions in Brazil. ENR was administered orally via medicated feed for 10 consecutive days at daily dosages of 10 mg/kg body weight (b.w.). The fish were slaughtered at 6, 12, and 24 h and 2, 3, 5, 8, 12, 17, and 24 days after the medication period. Considering a maximum residue limit of 100 μg/kg for the sum of the ENR and CIP residues in the fillet, the results obtained in the depletion study allowed the estimation of a half-life for ENR of 2.75 days and a withdrawal period of 23 days. The results obtained in this study are important for the farming of pacu in tropical regions.
Keywords