Antibacterial activity of herbal extract on pathogens isolated from the swollen hind gut of P. Monodon (fabricus)

Isolated and identified three species of V. harveyi, V. alginolyticus and V. parahaemolyticus from Swollen Hindgut infected black tiger shrimp seeds were tested against different types of extracts from plants such as Phyllanthus niruri (Stone breaker), Ricinus communis (Castor), Alizzia lebbeck (Albizia), Centella asiatica (Gotu Kola), Tinospora cordifolia (Tinospora Gulancha). The highest activity against the Vibrio harveyi was noticed by Ricinus communis (Castor) in methanol extract (19mm Inhibition zone). The Methanolic extract of R. communis was applied in culture tanks of P. monodon with different dosages which is compared with control tank. The vibrio population decreased (0.64× 104 CFU /ml) at the end of culture in experimental tanks. Hence it is clear that the methanol extract of R. communis played a vital role in the disease resistance of black tiger shrimp P. monodon.

Author(s): Sankar G, K. Ramamoorthy, K. Sakkaravarthi and A. Elavarsi

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