Journal of Aquaculture Research & Development

Bakerâ??s yeast (Saccharomyces cerevisiae) as immunostimulant for Asian sea bass (Lates calcarifer, BLOCH 1790)

7^th International Conference on Aquaculture & Fisheries

October 19-21, 2017 | Rome, Italy

Michelle A De Vera and Marjorie G Ramos

Mariano Marcos State University, Philippines

Posters & Accepted Abstracts: J Aquac Res Development

Abstract:

This study was conducted to test the efficacy of bakerâ??s yeast (Saccharomyces cerevisiae) as immuno-stimulant for sea bass (Lates calcarifer) fingerlings. The bakerâ??s yeast was supplemented in the sea bass diet at different levels namely: 0, 10, 20, 30, 40, and 50 g kg-1. Hematological analysis was conducted before and after the challenge test with Aeromonas salmonicida. Clinical signs of disease and mortality were also recorded. Before the challenge test, White Blood Cell count (WBC) is normal for all treatments, but for hemoglobin and hematocrit, only treatments 5 (40 g kg-1) and 6 (50 g kg-1) are within the normal value. The difference after the challenge test shows an increase in WBC count for all the treatments, decrease in hematocrit and hemoglobin for treatments 3 (20 g kg-1), 4 (30 g kg-1) and 5 (40 g kg-1). Treatment 1 (0 g kg-1) showed lethargy, loss of appetite, loss of equilibrium, red sore and exophthalmia. Treatments 2 (10 g kg -1), 3 and 4 also showed most of these signs while treatments 5 and 6 showed lethargy and loss of appetite and have recovered immediately. In terms of mortality, there was decreasing mortality with increasing level of bakerâ??s yeast in the diet. Sea bass in treatment 1 were all infected and died. Treatment 2 has 91.67% mortality followed by treatment 3 with 61.00% and treatment 4 and 5 with 8.33%. The result of the study showed that bakerâ??s yeast is a good immunostimulant for sea bass fingerlings infected with A. salmonicida.