Alternative fish feeds: the use of industrial wastes and by-products for the culture of the African catfish, Clarias gariepinus (Burchell, 1822)
Sulem, Y.S. (1987). Alternative fish feeds: the use of industrial wastes and by-products for the culture of the African catfish, Clarias gariepinus (Burchell, 1822). MSc Thesis. VUB: Brussel. 133 pp.
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Documenttype: Doctoraat/Thesis/Eindwerk
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| Abstract |
The development of alternative fish feeds can contribute considerably to reducing production costs in pisciculture. This work is an attempt to develop and improve artificial feeds consisting of industrial wastes and by-products for the culture of Clarias gariepinus. In our first experiment, we try to optimise the use of Artemia salina as a first feed for Clarias gariepinus. The aim is not only to economise on this invaluable feedstuff but also to study the factors that underlie its suitability. Results pertaining to these factors (enzyme content, water content, role in metamorphosis) are discussed and perspectives of their role in ameliorating artificial feeds and feeding are presented. In our second experiment, we prepare and test four feeds with varying levels of brewer's yeast, Tortula yeast and fishmeal. Commercial fishfood is used as a reference and its performance is compared with that of experimental feeds. The suitability and incorporation of brewer's yeast in feeds for Clarias gariepinus is discussed. Finally, we try to improve the digestibility of the best experimental feed from the second experiment by incorporating various levels of fibre-rich ingredients, namely molt sprouts and brewers' grains. The effect of these feedstuffs is discussed on basis of their fibre content. |
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