During the last
decade, shrimp aquaculture has developed rapidly in many developing countries. Antibiotic
resistance is a major problem in shrimp aquaculture. Seaweeds are considered as
potent source of bioactive compounds that are able to produce biological
activities. The aim of this study was to evaluate the antibacterial activity of
ethanolic and chloroformic crude extracts of the brown algae, Sargassum latifolium
derived from Persian Gulf waters. The extractions against shrimp selective
pathogen bacteria including Vibrio alginolyticus, V. parahaemolyticus and
V. harveyi were used by disk diffusion agar method. Results
revealed that all mentioned bacteria were sensitive to both ethanolic and chloroformic
crude extracts of S.latifolium. The minimum inhibitory concentration of
chloroformic extract of S. latifolium against the bacteria was performed
by tube dilution technique. MICs were 5, 10 and 10 mg ml-1 for V.
alginolyticus, V. parahaemolyticus and V. harveyi, respectively while
minimum bactericidal concentrations (MBC) were 5, 15 and 20 mg ml-1.
This study recommended that S.latifolium isolated from Persian Gulf
waters has antibacterial activity potential against shrimp pathogen bacteria.