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Fisheries, Animal and Veterinary Science


Background and Objectives: Marine algae, especially brown algae (Sargassum sp.), is a natural compound plant capable of being prophylactic and immunostimulant. This study was aimed to evaluate the efficacy of seaweed (Sargassum sp.) extract to improve resistance and immune response of juvenile white shrimps (Litopenaeus vannamei ) infected by Vibrio algynolyticus .

Materials and Methods: The ethanolic extract of seaweed was used to evaluate its antibacterial effect by immerse the juvenile shrimp at a dose level of 0 (control), 150, 250 and 350 ppm for 3 h. Shrimp immune response was observed based on total haemocyte count (THC) and differential haemocyte count (DHC). Moreover, the bacterial challenge test was used for the evaluation of shrimp resistance.

Results: The immersed shrimp in 150 ppm extract showed a significant increase in the number of THC and improve DHC value. During bacterial challenge test, shrimp juveniles immersed in 150 and 250 ppm had a 100% relative percent survival (RPS) which was higher than those in 350 ppm that had only 50% survival. Moreover, there were no significant histological changes of the hepatopancreas organ following infection in shrimps immersed in 150 and 250 ppm seaweed extract groups, whereas shrimps in control group showed hyperplasia and necrotic in nucleus cells. In addition, changes in the form of excess fat infiltration occured in tissues indicates the vulnerability of shrimp in control group.

Conclusion: The study indicates that extract of brown seaweed Sargassum sp. is a potential immunostimulant to be used in juvenile white shrimps culture to control vibriosis.

Publication Title, e.g., Journal

International Journal of Zoological Research



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