Oxolinic acid in the trout: bioavailability and tissue residues.

A study was performed on the serum bioavailability and tissue elimination of oxolinic acid in the trout. The compound was added to the diet and administered at a dosage-level of 12 mg/kg/day for 7 consecutive days. The study utilized an analytical technique, high performance liquid chromatography, which has been described in detail here. The results obtained demonstrate that serum concentrations higher than the MIC for the control of the target pathogens (Aeromonas and Yersinia) can by sustained throughout the treatment period. The same positive results were observed in the tissues. Besides, on the base of a tolerance level of 0.05 ppm for the residue levels of oxolinic acid in the edible tissues (muscle mass and skin), a withdrawal time of six days after interruption of the prescribed treatment can be proposed.