Lila Rungpan, Sathaporn Direkbussarakom, Yaowanit
Danayodol, Yubonrat Srikoew-1996
Abstract:
Fifteen commercial drugs used in the control of bacterial diseases of cultured Penaeus monodon were examined for their effectiveness in inhibiting growth of 90 luminous and 30 non-luminous vibrio strains. The MIC of the studied drugs against luminous and non-luminous vibrio bacteria ranged from 0.2-100 and 0.8-100 mg/ml, respectively. The LC50 of the strains was observed to be 6.3-100 and 12.5-50 mg/ml, and LC90 50-100 and 25-100 mg/ml, respectively. The percentage of drug resistant strains was between 32-85 and 29-90%, respectively. The recommended concentration of each drug inhibited 9-36 and 0-20% of the tested bacteria. The results indicate that most commercial drugs are not very effective when used to control bacterial pathogens isolated from black tiger shrimp.
(National Institute of Coastal Aquaculture, Kaoseng, Songkhla 90000,
Thailand)