Abstract:

Tiger shrimp (Penaeus monodon fabricus) from Bangkok, Thailand, were examined for antibiotic residues. Samples were purchased monthly from open markets between October 1990 and October 1991.
The standard four plate test was used for antibiotic detection during October 1990 through April 1991. Later on, bacillus subtilis in peptone free media, and B. stearothermophilus were included. Overall, 8.4 per cent of the 1,461 samples were tested positive. The incidence rate of antibiotic residues each month varied from 0 to 37 per cent.
Identification of antibiotics from 21 positive samples carried out using HPLC showed that oxoline acid (OA) and oxytetracycline (OTC) were present in 12 and 9 samples, respectively. The concentrations of the drugs were 0.02-2.25 mg•l-^₁ for OA and 0.06-0.42 mg•l-^₁ for OTC.

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Date 1994/06/01

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