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Brewer’s yeast as a protein source in the diet of tilapia (Oreochromis niloticus) and freshwater prawns (Macrobrachium rosenbergii) reared in a clear water or biofloc environment

Nguyen, Huu Yen Nhi (2019). Brewer’s yeast as a protein source in the diet of tilapia (Oreochromis niloticus) and freshwater prawns (Macrobrachium rosenbergii) reared in a clear water or biofloc environment. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2019:21
ISBN 978-91-7760-360-3
eISBN 978-91-7760-361-0
[Doctoral thesis]

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Abstract

This thesis investigated the effects of dietary protein replacement of fishmeal or soybean meal with spent brewer’s yeast (SBY) in farmed tilapia and giant freshwater prawns. The effect of rearing tilapia and prawn in two different rearing systems, clear water recirculating aquaculture system (CW-RAS) and biofloc recirculating aquaculture system (Bio-RAS), were also investigated.

The fish reared in Bio-RAS displayed higher growth, a higher protein efficiency ratio and a lower feed conversion rate than fish reared in CW-RAS. This difference between systems was not as apparent in the growth and protein efficiency ratio of freshwater prawns.

In freshwater prawns, the survival rate was not affected by aquaculture water system nor by the replacement of fishmeal with SBY. The growth performance of prawns was not significantly different between any dietary treatments in Bio-RAS or CW-RAS. Significant differences were only found between brewer’s yeast replaced fishmeal at 60% in a CW-RAS and at 40% in Bio-RAS.

Tilapia reared in CW-RAS with replacement of fishmeal with SBY showed a significantly (p<0.05) lower weight gain, daily weight and specific growth rate than fish in Bio-RAS when all diet groups per treatment was combined. However, at diet group level this difference was significant only in the 100% replacement group of CW-RAS when compared with the control in Bio-RAS.

The protein requirement experiment showed that 27% and 31% crude protein can be used for tilapia in Bio-RAS and CW-RAS, respectively. The study demonstrated that tilapia reared in the Bio-RAS had a higher capacity to compensate for a reduction in dietary protein levels, as demonstrated by a higher growth rate than in fish reared in CWRAS. The apparent digestibility of crude protein by tilapia was high in diets with high crude protein, but there was no difference between the two rearing systems.

SBY replace up to 100% of soybean meal without a significant reduction in tilapia growth. Tilapia exhibited the best performance when fed a diet where 30% soybean meal was replaced with SBY.

This thesis concludes that SBY represents a sustainable, high-volume protein substitute for fishmeal and soybean meal in tilapia and giant freshwater prawn production and that the protein requirement of tilapia can be reduced if reared in a high-density microbial environment, i.e. a so-called Bio-RAS.

Authors/Creators:Nguyen, Huu Yen Nhi
Title:Brewer’s yeast as a protein source in the diet of tilapia (Oreochromis niloticus) and freshwater prawns (Macrobrachium rosenbergii) reared in a clear water or biofloc environment
Series/Journal:Acta Universitatis Agriculturae Sueciae (1652-6880)
Year of publishing :2019
Volume:2019:21
Number:2019:21
Number of Pages:76
Papers/manuscripts:
NumberReferences
INhi NHY*, Da CT, Lundh T, Lan TT, Kiessling A (2018). Comparative evaluation of Brewer's yeast as a replacement for fishmeal in diets for tilapia (Oreochromis niloticus), reared in clear water or biofloc environments. Aquaculture, 495, 654-660.
IINguyen Huu Yen Nhi*, Trinh Thi Lan, Chau Thi Da, Kartik Baruah, Torbjörn Lundh and Anders Kiessling. Spent brewer‘s yeast as a replacement for fishmeal in diets for giant freshwater prawn (Macrobrachium rosenbergii), reared in either clear water or a biofloc environment. (Accepted, Aquaculture nutrition).
IIINguyen Huu Yen Nhi, Trinh Thi Lan, Kartik Baruah, Torbjörn Lundh and Anders Kiessling. Nitrogen retention and protein requirement in Nile tilapia (Oreochromis niloticus) reared in clear water or biofloc water and fed different levels of crude protein. (Manuscript).
IVNguyen Huu Yen Nhi, Trinh Thi Lan, Kartik Baruah, Torbjörn Lundh and Anders Kiessling. Brewer's yeast as a protein source replacement for soybean meal in tilapia (Oreochromis niloticus) cultured in biofloc or clear water recirculation systems. (Manuscript).
Place of Publication:Uppsala
Publisher:Department of Animal Nutrition and Management; Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-360-3
ISBN for electronic version:978-91-7760-361-0
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Article category:Other scientific
Full Text Status:Public
Agris subject categories.:M Aquatic sciences and fisheries > M01 Fisheries and aquaculture - General aspects
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Fish and Aquacultural Science
(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 208 Environmental Biotechnology > Water Treatment
Keywords:Nile tilapia, spent brewer’s yeast, Bio-RAS, CW-RAS, biofloc, freshwater prawns, alternative protein, growth performance, recirculation system, soybean meal
URN:NBN:urn:nbn:se:slu:epsilon-e-5268
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-5268
ID Code:16011
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Animal Nutrition and Management
Deposited By: SLUpub Connector
Deposited On:12 Mar 2019 14:24
Metadata Last Modified:22 Mar 2019 16:28

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