Sargassum polycystum polysaccharide extract improved immunological responses and enhanced resistance of Penaeus monodon against Vibrio harveyi infection

Document Type : Original research

Authors

1 University of Antique – College of Fisheries and Environmental Studies, Tario Lim Memorial Campus, Tibiao, Antique, Philippines; Institute of Aquaculture, College of Fisheries and Ocean Sciences, University of the Philippines Visayas, 5023 Miag-ao, Iloilo, Philippines

2 Institute of Aquaculture, College of Fisheries and Ocean Sciences, University of the Philippines Visayas, 5023 Miag-ao, Iloilo, Philippines

Abstract

The present study evaluated the influence of acidic polysaccharide extracted from Sargassum polycystum (SAPE) on growth, immunological responses and resistance to Vibrio harveyi infection of juvenile Penaeus monodon. Five experimental diets supplemented with 100mg/kg, 500mg/kg, 1000mg/kg and 2000mg/kg SAPE including a control (0mg/kg) were formulated and fed to juvenile P. monodon for 50 days. Following the feeding trial growth indices including weight gain and specific growth rate were significantly enhanced, (P < 0.05), in treatment groups fed with diets containing 2000mg/kg SAPE. Highest survival (46.67±11.54%, P < 0.05) following the infection challenge test with the pathogenic V. harveyi was observed in the treatment group receiving the 2000mg/kg SAPE supplementation while all shrimp died in the group receiving the control diet. The enhanced resistance to bacterial infection of SAPE treatment groups was further supported by improved immune responses (P < 0.05) including total hemocyte counts and serum antibacterial activities. The present study indicates that dietary supplementation of acidic polysaccharide extracted from Sargassum polycystum at a dose of 2000mg/kg could enhance growth performance, elevate immune responses and significantly improve resistance of juvenile P. monodon against V. harveyi infection.

Keywords

International Aquatic Research
Volume 14, Issue 3
September 2022
Pages 181-192

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