Department of Marine Sciences, Chabahar Maritime University, Fisheries group, Chabahar, Iran
Title: Effects of Diets Supplemented With Polysaccharide Extract From Algae, Padina australis on growth, antioxidant and nonspecific immune status of shrimp, Litopenaeus vannamei
This study was conducted to investigate the effects of different levels of a water-soluble polysaccharide extract from brown algae, Padina australis (WPP) on growth, antioxidant enzymes activities and nonspecific immune responses of shrimp, Litopenaeus vannamei . Three replicate groups of shrimp (1 ± 0.1g) were fed four isonitrogenous and isolipidic diets containing four levels, 0 or control, 0.5, 1.0, and 1.5 g kg-1 of WPP for 8 weeks. Results show that the diet containing 1.0 g kg-1 of WPP had a significant positive effect on growth performance of shrimp. In addition, the activities of antioxidant enzymes including superoxide dismutase, glutathione peroxidase, catalase and malondialdehyde improved by feeding 0.5 and 1 g kg-1 of WPP. Also, the lysozyme and phenoloxidase activities in those of shrimp fed 0.5 and 1 g kg-1 of WPP were significantly higher than those fed control and 1.5 g kg-1 WPP. These results suggested that the use of 1.0 g kg-1 of water-soluble polysaccharides of P. australis can be beneficial for growth, antioxidant and nonspecific immune of L. vannamei.
Keywords: Water-soluble polysaccharides, Padina australis, Litopenaeus vannamei, Antioxidant enzyme and Immune response.