Title: Effect of replacing marine protein with hydrolyzed feather meal on gowth, apparent digestibility and body composition of juvenile tilapias (Oreochromis mossabicus)

Author(s): Jacob Abwao Oucho
Final project
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Supervisors: Olafur Sigurgeirsson
feather meal; juvenile; tilapia;


This study was conducted to determine the effect of hydrolyzed feather meal on growth, apparent digestibility and body composition of tilapia Oreochromis mossambicus. Five hundred fish were distributed in a completely randomized design with five treatments in quadruplicates with 25 fish (average weight 3.42±1.02g) per tank. The fish were fed isoproteinous diet with increasing inclusion levels of hydrolyzed feather meal (HFM) (0%, 4%, 8% 10% and 12%) designated as HFM0, HFM4, HFM8, HFM10 and HFM12 respectively. Fish fed the diet containing 10% and 12% HFM exhibited a significantly higher growth and nutritional parameters (P<0.05) in terms of mean final weight (8.05± 2.56 and), specific growth rate (3.67±0.29 g), food conversion ratio (1.97±0.11 g) and mean weight gain (4.9±0.33), compared to the other diets. Final body composition was influenced significantly by increasing the level of HFM through decreasing carcass moisture and lipids. Diet containing 12% HFM had significantly lower protein (11.75±0.05%) and ash (8.43±0.51) compared to diet HFM0. Inclusion levels of HFM also improved digestibility and degree of hydrolysis. The diet recommended for O. mossambicus in this study is HFM10.

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