On Valorization of Brewer’s Yeast as an Environmentally Sustainable Fishmeal Replacement in Labeo rohita Nutrition: Insight to Growth Attributes, Digestive Enzyme Activities and Haemato-biochemical Indices

• Published in: Waste and biomass valorization Vol. 15; no. 6; pp. 3503 - 3517
• Main Authors: Pradhan, Debashish, Swain, Himanshu S., Upadhyay, Aurobinda, Sahu, Brundaban, Nanda, Saumyendra, Patra, Sushanta K., Samantaray, Kasturi, Mohanta, Kedar N., Giri, Siba S.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 2024; Springer Nature B.V
• Subjects: Alanine; Alanine transaminase; Alkaline phosphatase; Aspartate aminotransferase; Body weight; Body weight gain; Cell size; Conversion ratio; Diet; Efficiency; Engineering; Environment; Environmental conditions; Environmental Engineering/Biotechnology; Enzymatic activity; Feed conversion; Fish meal; Fish nutrition; Globulins; Hemoglobin; Industrial Pollution Prevention; L-Lactate dehydrogenase; Labeo rohita; Lactate dehydrogenase; Nutrition; Original Paper; Proteins; Renewable and Green Energy; Serum proteins; Sustainable fisheries; Transaminases; Waste Management/Waste Technology; Yeast; Yeasts; Digestive enzymes; Hematology; Brewer’s spent yeast; growth attributes
• ISSN: 1877-2641; 1877-265X
• DOI: 10.1007/s12649-023-02289-z

Fishmeal replacement in aquafeed is a prime challenge for researchers in the modern era of fish nutrition. Six isonitrogenous diets (27% protein) were prepared with graded fishmeal replacement i.e., 0% (Control), 20% (D1), 30% (D2), 40% (D3), 50% (D4) and 100% (D5) by brewer’s spent yeast (BSY). The efficiency of these diets was evaluated on Labeo rohita (2.0 ± 0.02 g) fingerlings in 90-day feeding trial under controlled environmental conditions of 250 L FRP tanks. All treatments were having three replicates and fed with 4% body weight. The result revealed that 30% replacement of fishmeal showed significantly higher values in terms of growth attributes like weight gain, average daily growth, specific growth rate and survival (%) than that of control and other BSY incorporated diet. The feed utilization in terms of feed conversion ratio, feed conversion efficiency, protein efficiency ratio and apparent net protein utilization was significantly better in D2, followed by D3. The highest value of RBC, haemoglobin and packed-cell volume was found in D2, whereas that of WBC was found in D5. The amylase activity was highest in D1 whereas lipase and protease were highest in D2. The level of cortisol, glucose, alkaline phosphatase and lactate dehydrogenase was lowest in D2. Both liver enzymes such as alanine aminotransferase and aspartate aminotransferase were also significantly lower in D2 and gradually increased with the inclusion of brewer’s yeast. A similar trend was observed in serum protein, albumin and globulin level. Hence the study infers that a 30% replacement of fishmeal with brewer’s spent yeast can significantly induce growth performances and immunity in L. rohita . Graphical Abstract