Jozelle Grace E. Justiniani (March 2008)
Philippine Science High School Western Visayas Campus – Department of Science and Technology (DOST-PSHS WVC), Brgy. Bito-on, Jaro, Iloilo City 5000, Philippines
ABSTRACT
Seaweeds are abundant in the Philippines and are used as food and local medicine. They have high protein content and high concentrations of minerals, trace elements, and vitamins.
Vibriosis causes an increase in the mortality rate of fish and prawns. It is caused by the genus vibrio.
This study aimed to determine the antibacterial activity of the crude extracts of the red algae, E.denticulatum and G.acerosa, against fish pathogens, V.alginolyticus and V.harveyi.
The mean zone of inhibition of V.harveyi inhibited by G.acerosa was higher than that of E.denticulatum and relatively close to that of chloramphenicol. The mean zone of inhibition of V. alginolyticus inhibited by G.acerosa was relatively close to that of chloramphenicol and higher than that of E.denticulatum.
The effects of G.acerosa is comparable to that of chloramphenicol. G.acerosa and can be used as an alternative to chloramphenicol as an antibacterial of V.alginolyticus and V.harveyi.