Abstract
Abstract
One week of study was conducted to observe the potential of ginger crude extract in the treatment of tiger grouper (Epinephelus foscoguttatus) infected by a pathogenic bacterium in aquaculture, Aeromonas hydrophila. A total of 135 fish were injected intraperitoneally with 0.1ml of A. hydrophila (106 CFU ml−1) and stock in 15 aquaria (13L). Four concentrations of ginger extract (0.4g/L, 0.8g/L, 1.2g/L and 2.0g/L) were used as the treatment and the control is 0g/L. Water parameters such as dissolved oxygen, pH, temperature and salinity of the treatment tank were in the range of (4.05 – 4.20 ppm), (7.2 – 8.2), (25.6 – 28.8°C) and (22-25ppt) respectively. The extract’s potential as a treatment agent in the infected fish was recorded in terms of fish survival and physical condition such as the sign of bacterial infection and swimming behaviour. The results show infected tiger grouper treated with a concentration of ginger extract of 0.8g/L can improve the survival rate of fish by 89%. It can be concluded that crude ginger extract can enhance the survival rate and has the potential to be used as a chemotherapeutic agent in bacterial infection of tiger grouper fish.