Lila Ruangpan, Chaiwud Sudthongkong, Yubonrat
Srikaew-1996
Abstract:
Luminous bacteria in the Penaeus monodon farming area of Songkhla province were studied from October 1994 to December 1995. The samples were obtained from 3 stations including coastal area, rearing farms and hatcheries. The numbers of luminous bacteria were 0-1.7 x 10, 9.1 x 10 - 1.2 x 10^2, 0.3 x 10 - 1.4 x 10^2 CFU/mL, while the Vibrio spp. were 1.5 x 10^2- 8.7 x 10^2, 3.0 x 10^2- 5.5 x 10^3, and 0.4 x 10^2- 3.5x10^2 CFU/mL, respectively. Based on 45 tests of 60 strains, the luminous bacteria were identified as Vibrio harveyi 54 strains and V. cholerae biotype V. albensis 6 strains. Minimal inhibitory concentration of 6 chemotherapeutants including trimethoprim, chloramphenicol, oxolinic acid, oxytetra-cycline, norfloxacin and kanamycin against the bacteria ranged from 3.13 - 25, 3.13 - 50, 12.5 - 100, 6.25 - 100, and 100 > 100 mg/ml. The number of strains resistant to the tested antibiotics were 0, 0, 10, 30, 100 and 100, respectively.
(National Institute of Coastal Aquaculture, Kaoseng, Songkhla 90000, Thailand)