Evaluation of Dietary Yeast Autolysates for Red Sea Bream, Pagrus major

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Nutritive values of yeast autolysates, Candida utilus (CA), Hansenula anomala (HA) and Rhodotorula glutinis (RA), and their mixtures, C. utilus + R. glutinis (CRA), H. anomala + R. glutinis (HRA) and C. utilus + H. anomala (CHA) as a single cell protein (SCP), were evaluated by substituting near half of fish meal in a diet for red sea bream, Pagrus major. Apparent protein digestibilities of diets including CA, HA, CRA and CHA were similar to a control fish meal diet, but those of diets including RA and HRA were significantly lower than the control diet. Apparent lipid digestibilities of diets including CA, HA and RA, apparent sugar and energy digestibilities of diets excepting the diet including CHA were significantly lower than the control diet. Fish given diets including CRA and HRA maintained higher daily intake but lower feed efficiency, protein efficiency ratio, energy efficiency and apparent protein and lipid retentions than fish given the control diet. Therefore, the CHA was evaluated as useful dietary SCP for red sea bream, due to comparable weight gain, growth performance and digestibility to fish given the control diet.
日本水産増殖学会の論文