Preliminary study: Padina australis Hauck's antibacterial activity and phytochemical test against pathogenic shrimp bacteria

Abstract

The potential of aquaculture organism, Shrimp, need extra watchfulness to prevent it against the pathogenic bacteria attack. The use of synthetic antibiotics in shrimp can make pathogenic bacteria resistant and pollute the environment. Lately, Marine Natural Products (MNP) are other ways to overcome this problem. In this study, the MNP were extracted from macroalga Padina australis Hauck. The study aimed to examine the antibacterial activity of n-hexane, ethyl acetate, acetone, and ethanol crude extract against three pathogenic shrimp bacteria (Vibrio harveyi, Vibrio parahaemolyticus, and Aeromonas hydrophilla) and phytochemical screening, respectively. Ethyl acetate crude extracts of Padina australis Hauck showed that it could act as an antibacterial agent against Vibrio harveyi (1,76 mm), Vibrio parahaemolyticus (2,3 mm) and Aeromonas hydrophilla (4,43 mm). The phytochemical tests revealed that P. australis Hauck contains a steroid, terpenoid, phenolic, tannin, and alkaloid compounds.