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600, 2-month-old African sharptooth catfish, body weight 30-45 g, were distributed into 24, 500-litre tanks. Fish meal in diets was replaced with tomato waste, extracted or extruded soyabean meal, brewers' yeast or mixed with all ingredients, in isonitrogenous (38% protein) diets and fed to the...

Hoffman, L. C.; Prinsloo, J. F.; Rukan, G.
Water SA, 1997, 23, 2, pp 181-186