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The research aimed to study  Sonneratia alba  leaves extract to inhibit  Vibrio harveyi  and  Saprolegnia  sp., and to evaluate its effectiveness to protect the post larvae of tiger shrimp against the infections. The leaves of  S. alba  were cleaned, chopped, dried, macerated and extracted in three different solvents namely ethanol 80%, freshwater and saline water. The post larvae 8 then immersed with the extract and infected with  Vibrio harveyi  and  Saprolegnia  sp. The clinical signs, pathological anatomy, total vibrio count, prevalence, survival rate, and relative percentage of survival were observed. The results showed that  S. alba  leaves extract inhibited  V. harveyi  and  Saprolegnia  sp. on post larvae of tiger shrimp, improve survival rate and relative percentage survival. The most effective dosage was 1,250 mg/L either for ethanolic, freshwater and saline water solvents.

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Sonneratia alba Extract Protects the Post Larvae of Tiger Shrimp Penaeus monodon against Vibrio harveyi and Saprolegnia sp.