A total of 471 samples of livestock and fishery products were analyzed for antibacterial residues. Samples were collected in Osaka from 1990 to 1994. Livestock products were analyzed for five kinds of sulfa drugs, oxolinic acid, furazolidone, thiamphenicol, decoquinate and amprolium. Cultured fishes were analyzed for three kinds of sulfa drugs, oxolinic acid, sodium nifurstyrenate and furazolidone. Antibacterial residues were detected in two out of 471 examined samples. Sulfadimidine was detected in one (0.04 mg/kg) of 44 samples of imported pork. Oxolinic acid was detected in one (0.03 mg/kg) of 16 samples of imported eel. Antibacterial agents were not detected in pork (domestic), beef, chicken, duck, chicken egg, sweet fish, rainbow trout, yellow tail, sea breams, bastard halibut, flatfish, horse mackerel, puffer and prawn.