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- W2000300221 abstract "Vibriosis is a common bacterial disease that can cause high mortality and morbidity in farmed shrimp. Since compounds from seaweed have been reported to have anti-bacterial and immunostimulant activity, this study was conducted to determine whether solvent extracts from the red seaweed Gracilaria fisheri might be a possible alternative for prevention and treatment of shrimp vibriosis caused by Vibrio harveyi. Seaweed extracts prepared using ethanol, methanol, chloroform and hexane were evaluated for anti-V. harveyi activity by the disc-diffusion method. The ethanol, methanol and chloroform extracts showed activity against a virulent strain of V. harveyi with potency (minimal inhibitory concentrations in the range of 90–190 μg ml−1) equivalent to the antibiotic norfloxacin. The ethanol extract was not toxic to the brine shrimp Artemia salina when it was fed to them for enrichment prior to their use, in turn, as feed for postlarvae of Penaeus monodon. Postlarvae fed with these enriched Artemia gave significantly lower mortality than control postlarvae after challenge with V. harveyi. In addition, P. monodon juveniles injected with the ethanol extract showed a significant increase in the total number of haemocytes and an increased proportion of semi-granulocytes and granulocytes when compared to control shrimp. The activities of phenoloxidase and superoxide dismutase were also increased, with an accompanying increase in superoxide anion production. When these juvenile shrimp were challenged with V. harveyi, mortality was markedly reduced compared to that of control shrimp. The results indicated that ethanol extracts of G. fisheri had immunostimulant and antimicrobial activity that could protect P. monodon against V. harveyi." @default.
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- W2000300221 date "2011-01-01" @default.
- W2000300221 modified "2023-09-27" @default.
- W2000300221 title "Solvent extracts of the red seaweed Gracilaria fisheri prevent Vibrio harveyi infections in the black tiger shrimp Penaeus monodon" @default.
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- W2000300221 doi "https://doi.org/10.1016/j.fsi.2010.11.016" @default.
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