Various polysaccharides extract from marine algae to increase the non-specific immune system in crustacean. In this study, effects of hot water extract on total haemocyte count , total plasma protein , Phagocytic activity , bacterial clearance efficiency and bactericidal activity while the shrimp F. indicus (10.12±2.18 g) were immersed in seawater (40g L-1 and 25±0.8 ○C) containing hot-water extract of brown algae Padina boergesenii at 100, 300 and 500 mg L-1 for 1 to 4 hours, were investigated. These parameters increased significantly (p < 0.05) when the shrimp were immersed in seawater containing hot water extract at 100 mg L-1 after 3h and 300 and 500 mg L-1 after 2 h. F. indicus that were immersed in hot water extract at 300 and 500 mg L-1 had significantly increased phagocytic activity and increased clearance efficiency to Vibrio harveyi after 2 hours. But bactericidal activity increased after 1 hour immersed in 500 mg L-1 concentration.
کلید واژگان :
Fenneropenaeus indicus, Padina boergesenii, Total haemocyte count, Total plasma protein, Phagocytic activity, Bactericidal activity
