Evaluation of brewer's waste as partial replacement of fish meal protein in nile tilapia, oreochromis niloticus, diets

Desale B. Zerai, Kevin Fitzsimmons, Robert J Collier, Glenn C. Duff

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28 Scopus citations


Brewer's waste is one of the promising protein source by-products for fish diets. A 10-wk feeding trial experiment involving five different diets with increasing levels of brewer's waste (32% crude protein) was carried out to evaluate the use of brewer's waste in tilapia diets in place of fish meal. Growth performance was compared against a control diet formulated to have similar composition to a typical commercial diet. Four experimental diets replaced successively 25, 50, 75, and 100% of the fish meal protein with brewer's waste. The diets were isonitrogenous and isocaloric. Results indicated that weight gain did not differ significantly (P > 0.05) with up to 50% replacement. Feed intake and utilization were depressed at high levels of brewer's waste. In addition, methionine of high replacement level diets was low. The results of the digestibility trial demonstrated that the brewer's waste used in this study has an apparent digestibility coefficient for protein of 70%. It was concluded that 50% of the fish meal protein in a typical commercial diet could be replaced with brewer's waste with no adverse effect on growth and feed utilization for tilapia.

Original languageEnglish (US)
Pages (from-to)556-564
Number of pages9
JournalJournal of the World Aquaculture Society
Issue number4
Publication statusPublished - Aug 2008


ASJC Scopus subject areas

  • Aquatic Science

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