Potentials of Kappaphycus striatum(Schritz) and Gracilaria heteroclada Zhang(Ad Xia) to control the growth of luminous bacteria Vibrio harveyi
2010
Tendencia, E.A. | dela Peña, M.R., Southeast Asian Fisheries Development Center, Tigbauan, Iloilo 5021 (Philippines)
Different aquaculture species such as fin fishes and bivalves have been reported to control the luminous bacterial disease of shrimp, usually caused by Vibrio harveyi. The use of seaweed in shrimp culture system has reportedly improved the water quality and reduced the bacterial count. This study evaluated the potentials of two species of seaweeds, Gracilaria heteroclada (Ad Xia) and Kappaphycus striatum (Schnitz), to control the growth of V. harveyi. V. harveyi was inoculated into control tanks containing shrimps only and into treated tanks containing both shrimp and macro algae. Luminous bacterial counts were monitored daily. From day 2 to day 6, luminous bacterial count in the tanks with G. heteroclada was significantly lower than those in tanks with K. striatum. Bacteria isolated from rearing water containing K. striatum and G. heteroclada and from the seaweed homogenized in sterile seawater showed anti-Vibrio harveyi activity. The seaweed homogenate per se also showed anti-luminous bacterial property. Presence of both G. heteroclada and K. striatum in shrimp culture system has the potential to control the growth of luminous bacteria. G.heteroclada was more efficient and sustainable, as shown by the lower luminous bacterial count and the higher percentage recovery of the macro algae after 11d in the experimental tanks.
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